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CVE-2002-1563 (GCVE-0-2002-1563)
Vulnerability from cvelistv5 – Published: 2003-04-26 04:00 – Updated: 2024-08-08 03:26
VLAI
EPSS
Summary
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
8 references
| URL | Tags |
|---|---|
| http://www.linuxsecurity.com/advisories/engarde_a… | vendor-advisoryx_refsource_ENGARDE |
| http://distro.conectiva.com.br/atualizacoes/?id=a… | vendor-advisoryx_refsource_CONECTIVA |
| http://marc.info/?l=bugtraq&m=104247606910598 | mailing-listx_refsource_BUGTRAQ |
| http://www.redhat.com/support/errata/RHSA-2003-223.html | vendor-advisoryx_refsource_REDHAT |
| http://marc.info/?l=stunnel-users&m=103600188215117&w=2 | x_refsource_MISC |
| http://www.securityfocus.com/bid/6592 | vdb-entryx_refsource_BID |
| http://marc.info/?l=bugtraq&m=106029168514511&w=2 | vendor-advisoryx_refsource_TRUSTIX |
| http://www.redhat.com/support/errata/RHSA-2003-221.html | vendor-advisoryx_refsource_REDHAT |
Date Public
2002-10-30 00:00
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}
FKIE_CVE-2002-1563
Vulnerability from fkie_nvd - Published: 2003-05-12 04:00 - Updated: 2026-04-16 00:27
Severity
Summary
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
References
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GHSA-6234-FX93-PWCR
Vulnerability from github – Published: 2022-04-30 18:21 – Updated: 2022-04-30 18:21
VLAI
Details
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
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},
"details": "stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.",
"id": "GHSA-6234-fx93-pwcr",
"modified": "2022-04-30T18:21:24Z",
"published": "2022-04-30T18:21:24Z",
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GSD-2002-1563
Vulnerability from gsd - Updated: 2023-12-13 01:24Details
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Aliases
Aliases
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RHSA-2003:221
Vulnerability from csaf_redhat - Published: 2003-07-25 13:14 - Updated: 2025-11-21 17:26Summary
Red Hat Security Advisory: : Updated stunnel packages fix signal vulnerability
Severity
Important
Notes
Topic: Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,
and 8.0. These updates correct a potential vulnerability in stunnel's
signal handling.
Details: Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over a secure connection (encrypted using
SSL or TLS) or to provide a secure means of connecting to services that do
not natively support encryption.
When configured to listen for incoming connections (instead of being
invoked by xinetd), stunnel can be configured to either start a thread or a
child process to handle each new connection. If Stunnel is configured to
start a new child process to handle each connection, it will receive a
SIGCHLD signal when that child exits.
Stunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal
handler which, if interrupted by another SIGCHLD signal, could be unsafe.
This could lead to a denial of service.
All users are urged to upgrade to these errata packages, which modify
stunnel's signal handler so that it is not vulnerable to this issue.
NOTE: After upgrading, any instances of stunnel configured to run in daemon
mode should be restarted, and any active network connections that are
currently being serviced by stunnel should be terminated and reestablished.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Linux 7.1
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.1
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.2
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.2
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.3
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.3
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 8.0
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:8.0
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
References
8 references
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RHSA-2003:223
Vulnerability from csaf_redhat - Published: 2003-07-25 13:17 - Updated: 2025-11-21 17:26Summary
Red Hat Security Advisory: stunnel security update
Severity
Important
Notes
Topic: Updated stunnel packages are now available. These updates correct a
potential vulnerability in stunnel's signal handling.
Details: Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over a secure connection (encrypted using
SSL or TLS) or to provide a secure means of connecting to services that do
not natively support encryption.
When configured to listen for incoming connections (instead of being
invoked by xinetd), stunnel can be configured to either start a thread or a
child process to handle each new connection. If Stunnel is configured to
start a new child process to handle each connection, it will receive a
SIGCHLD signal when that child exits.
Stunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal
handler which, if interrupted by another SIGCHLD signal, could be unsafe.
This could lead to a denial of service.
All users are urged to upgrade to these errata packages, which modify
stunnel's signal handler so that it is not vulnerable to this issue.
NOTE: After upgrading, any instances of stunnel configured to run in daemon
mode should be restarted, and any active network connections that are
currently being serviced by stunnel should be terminated and reestablished.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Enterprise Linux AS (Advanced Server) version 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::as
|
— |
Vendor Fix
fix
|
|
Red Hat Enterprise Linux ES version 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::es
|
— |
Vendor Fix
fix
|
|
Red Hat Enterprise Linux WS version 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::ws
|
— |
Vendor Fix
fix
|
|
Red Hat Linux Advanced Workstation 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::aw
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
References
9 references
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"title": "Topic"
},
{
"category": "general",
"text": "Stunnel is a wrapper for network connections. It can be used to tunnel an\nunencrypted network connection over a secure connection (encrypted using\nSSL or TLS) or to provide a secure means of connecting to services that do\nnot natively support encryption.\n\nWhen configured to listen for incoming connections (instead of being\ninvoked by xinetd), stunnel can be configured to either start a thread or a\nchild process to handle each new connection. If Stunnel is configured to\nstart a new child process to handle each connection, it will receive a\nSIGCHLD signal when that child exits.\n\nStunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal\nhandler which, if interrupted by another SIGCHLD signal, could be unsafe.\nThis could lead to a denial of service.\n\nAll users are urged to upgrade to these errata packages, which modify\nstunnel\u0027s signal handler so that it is not vulnerable to this issue.\n\nNOTE: After upgrading, any instances of stunnel configured to run in daemon\nmode should be restarted, and any active network connections that are\ncurrently being serviced by stunnel should be terminated and reestablished.",
"title": "Details"
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"summary": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117",
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RHSA-2003:296
Vulnerability from csaf_redhat - Published: 2003-11-24 08:44 - Updated: 2025-11-21 17:26Summary
Red Hat Security Advisory: : Updated stunnel packages available
Severity
Important
Notes
Topic: Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,
and 8.0 systems. These updates address problems stemming from improper use
of non-reentrant functions in signal handlers.
Details: Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over an encrypted connection (encrypted
using SSL or TLS) or to provide an encrypted means of connecting to
services that do not natively support encryption.
A previous advisory provided updated packages to address re-entrancy
problems in stunnel's signal-handling routines. These updates did not
address other bugs that were found by Steve Grubb, and introduced an
additional bug, which was fixed in stunnel 3.26.
All users should upgrade to these errata packages, which address these
issues by updating stunnel to version 3.26.
NOTE: After upgrading, any instances of stunnel configured to run in daemon
mode should be restarted, and any active network connections that are
currently being serviced by stunnel should be terminated and reestablished.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Linux 7.1
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.1
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.2
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.2
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.3
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.3
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 8.0
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:8.0
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows local users to hijack the Stunnel server.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Linux 7.1
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.1
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.2
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.2
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.3
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.3
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 8.0
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:8.0
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
References
13 references
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RHSA-2003_221
Vulnerability from csaf_redhat - Published: 2003-07-25 13:14 - Updated: 2024-11-21 22:47Summary
Red Hat Security Advisory: : Updated stunnel packages fix signal vulnerability
Severity
Important
Notes
Topic: Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,
and 8.0. These updates correct a potential vulnerability in stunnel's
signal handling.
Details: Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over a secure connection (encrypted using
SSL or TLS) or to provide a secure means of connecting to services that do
not natively support encryption.
When configured to listen for incoming connections (instead of being
invoked by xinetd), stunnel can be configured to either start a thread or a
child process to handle each new connection. If Stunnel is configured to
start a new child process to handle each connection, it will receive a
SIGCHLD signal when that child exits.
Stunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal
handler which, if interrupted by another SIGCHLD signal, could be unsafe.
This could lead to a denial of service.
All users are urged to upgrade to these errata packages, which modify
stunnel's signal handler so that it is not vulnerable to this issue.
NOTE: After upgrading, any instances of stunnel configured to run in daemon
mode should be restarted, and any active network connections that are
currently being serviced by stunnel should be terminated and reestablished.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Linux 7.1
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.1
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.2
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.2
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.3
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.3
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 8.0
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:8.0
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
References
8 references
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"lang": "en",
"notes": [
{
"category": "summary",
"text": "Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,\nand 8.0. These updates correct a potential vulnerability in stunnel\u0027s\nsignal handling.",
"title": "Topic"
},
{
"category": "general",
"text": "Stunnel is a wrapper for network connections. It can be used to tunnel an\nunencrypted network connection over a secure connection (encrypted using\nSSL or TLS) or to provide a secure means of connecting to services that do\nnot natively support encryption.\n\nWhen configured to listen for incoming connections (instead of being\ninvoked by xinetd), stunnel can be configured to either start a thread or a\nchild process to handle each new connection. If Stunnel is configured to\nstart a new child process to handle each connection, it will receive a\nSIGCHLD signal when that child exits. \n\nStunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal\nhandler which, if interrupted by another SIGCHLD signal, could be unsafe.\nThis could lead to a denial of service.\n\nAll users are urged to upgrade to these errata packages, which modify\nstunnel\u0027s signal handler so that it is not vulnerable to this issue.\n\nNOTE: After upgrading, any instances of stunnel configured to run in daemon\nmode should be restarted, and any active network connections that are\ncurrently being serviced by stunnel should be terminated and reestablished.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
}
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},
{
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"summary": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117",
"url": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117"
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"summary": "Canonical URL",
"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2003/rhsa-2003_221.json"
}
],
"title": "Red Hat Security Advisory: : Updated stunnel packages fix signal vulnerability",
"tracking": {
"current_release_date": "2024-11-21T22:47:38+00:00",
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"product_identification_helper": {
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}
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"vulnerabilities": [
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1616922"
}
],
"notes": [
{
"category": "description",
"text": "stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "security flaw",
"title": "Vulnerability summary"
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},
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"summary": "https://nvd.nist.gov/vuln/detail/CVE-2002-1563",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2002-1563"
}
],
"release_date": "2002-10-30T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2003-07-25T13:14:00+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nTo update all RPMs for your particular architecture, run:\n\nrpm -Fvh [filenames]\n\nwhere [filenames] is a list of the RPMs you wish to upgrade. Only those\nRPMs which are currently installed will be updated. Those RPMs which are\nnot installed but included in the list will not be updated. Note that you\ncan also use wildcards (*.rpm) if your current directory *only* contains the\ndesired RPMs.\n\nPlease note that this update is also available via Red Hat Network. Many\npeople find this an easier way to apply updates. To use Red Hat Network,\nlaunch the Red Hat Update Agent with the following command:\n\nup2date\n\nThis will start an interactive process that will result in the appropriate\nRPMs being upgraded on your system.",
"product_ids": [
"Red Hat Linux 7.1",
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"details": "Important"
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"title": "security flaw"
}
]
}
RHSA-2003_223
Vulnerability from csaf_redhat - Published: 2003-07-25 13:17 - Updated: 2024-11-21 22:47Summary
Red Hat Security Advisory: stunnel security update
Severity
Important
Notes
Topic: Updated stunnel packages are now available. These updates correct a
potential vulnerability in stunnel's signal handling.
Details: Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over a secure connection (encrypted using
SSL or TLS) or to provide a secure means of connecting to services that do
not natively support encryption.
When configured to listen for incoming connections (instead of being
invoked by xinetd), stunnel can be configured to either start a thread or a
child process to handle each new connection. If Stunnel is configured to
start a new child process to handle each connection, it will receive a
SIGCHLD signal when that child exits.
Stunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal
handler which, if interrupted by another SIGCHLD signal, could be unsafe.
This could lead to a denial of service.
All users are urged to upgrade to these errata packages, which modify
stunnel's signal handler so that it is not vulnerable to this issue.
NOTE: After upgrading, any instances of stunnel configured to run in daemon
mode should be restarted, and any active network connections that are
currently being serviced by stunnel should be terminated and reestablished.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Enterprise Linux AS (Advanced Server) version 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::as
|
— |
Vendor Fix
fix
|
|
Red Hat Enterprise Linux ES version 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::es
|
— |
Vendor Fix
fix
|
|
Red Hat Enterprise Linux WS version 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::ws
|
— |
Vendor Fix
fix
|
|
Red Hat Linux Advanced Workstation 2.1
Red Hat / Red Hat Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:2.1::aw
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
References
9 references
{
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"notes": [
{
"category": "summary",
"text": "Updated stunnel packages are now available. These updates correct a\npotential vulnerability in stunnel\u0027s signal handling.",
"title": "Topic"
},
{
"category": "general",
"text": "Stunnel is a wrapper for network connections. It can be used to tunnel an\nunencrypted network connection over a secure connection (encrypted using\nSSL or TLS) or to provide a secure means of connecting to services that do\nnot natively support encryption.\n\nWhen configured to listen for incoming connections (instead of being\ninvoked by xinetd), stunnel can be configured to either start a thread or a\nchild process to handle each new connection. If Stunnel is configured to\nstart a new child process to handle each connection, it will receive a\nSIGCHLD signal when that child exits.\n\nStunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal\nhandler which, if interrupted by another SIGCHLD signal, could be unsafe.\nThis could lead to a denial of service.\n\nAll users are urged to upgrade to these errata packages, which modify\nstunnel\u0027s signal handler so that it is not vulnerable to this issue.\n\nNOTE: After upgrading, any instances of stunnel configured to run in daemon\nmode should be restarted, and any active network connections that are\ncurrently being serviced by stunnel should be terminated and reestablished.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
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"summary": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117",
"url": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117"
},
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=98593"
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"summary": "Canonical URL",
"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2003/rhsa-2003_223.json"
}
],
"title": "Red Hat Security Advisory: stunnel security update",
"tracking": {
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{
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"product": {
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"title": "Vulnerability description"
},
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"category": "summary",
"text": "security flaw",
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},
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"product_ids": [
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},
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}
RHSA-2003_296
Vulnerability from csaf_redhat - Published: 2003-11-24 08:44 - Updated: 2024-11-21 22:52Summary
Red Hat Security Advisory: : Updated stunnel packages available
Severity
Important
Notes
Topic: Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,
and 8.0 systems. These updates address problems stemming from improper use
of non-reentrant functions in signal handlers.
Details: Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over an encrypted connection (encrypted
using SSL or TLS) or to provide an encrypted means of connecting to
services that do not natively support encryption.
A previous advisory provided updated packages to address re-entrancy
problems in stunnel's signal-handling routines. These updates did not
address other bugs that were found by Steve Grubb, and introduced an
additional bug, which was fixed in stunnel 3.26.
All users should upgrade to these errata packages, which address these
issues by updating stunnel to version 3.26.
NOTE: After upgrading, any instances of stunnel configured to run in daemon
mode should be restarted, and any active network connections that are
currently being serviced by stunnel should be terminated and reestablished.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Linux 7.1
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.1
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.2
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.2
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.3
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.3
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 8.0
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:8.0
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows local users to hijack the Stunnel server.
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Linux 7.1
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.1
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.2
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.2
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 7.3
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:7.3
|
— |
Vendor Fix
fix
|
|
Red Hat Linux 8.0
Red Hat / Red Hat Linux
|
cpe:/o:redhat:linux:8.0
|
— |
Vendor Fix
fix
|
Threats
Impact
Important
References
13 references
{
"document": {
"aggregate_severity": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"text": "Important"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en",
"notes": [
{
"category": "summary",
"text": "Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,\nand 8.0 systems. These updates address problems stemming from improper use\nof non-reentrant functions in signal handlers.",
"title": "Topic"
},
{
"category": "general",
"text": "Stunnel is a wrapper for network connections. It can be used to tunnel an\nunencrypted network connection over an encrypted connection (encrypted\nusing SSL or TLS) or to provide an encrypted means of connecting to\nservices that do not natively support encryption.\n\nA previous advisory provided updated packages to address re-entrancy\nproblems in stunnel\u0027s signal-handling routines. These updates did not\naddress other bugs that were found by Steve Grubb, and introduced an\nadditional bug, which was fixed in stunnel 3.26.\n\nAll users should upgrade to these errata packages, which address these\nissues by updating stunnel to version 3.26.\n\nNOTE: After upgrading, any instances of stunnel configured to run in daemon\nmode should be restarted, and any active network connections that are\ncurrently being serviced by stunnel should be terminated and reestablished.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
}
],
"publisher": {
"category": "vendor",
"contact_details": "https://access.redhat.com/security/team/contact/",
"issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
"name": "Red Hat Product Security",
"namespace": "https://www.redhat.com"
},
"references": [
{
"category": "self",
"summary": "https://access.redhat.com/errata/RHSA-2003:296",
"url": "https://access.redhat.com/errata/RHSA-2003:296"
},
{
"category": "external",
"summary": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=105980139926784",
"url": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=105980139926784"
},
{
"category": "external",
"summary": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=106221975232250",
"url": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=106221975232250"
},
{
"category": "external",
"summary": "http://marc.theaimsgroup.com/?l=bugtraq\u0026m=106260760211958",
"url": "http://marc.theaimsgroup.com/?l=bugtraq\u0026m=106260760211958"
},
{
"category": "self",
"summary": "Canonical URL",
"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2003/rhsa-2003_296.json"
}
],
"title": "Red Hat Security Advisory: : Updated stunnel packages available",
"tracking": {
"current_release_date": "2024-11-21T22:52:09+00:00",
"generator": {
"date": "2024-11-21T22:52:09+00:00",
"engine": {
"name": "Red Hat SDEngine",
"version": "4.2.1"
}
},
"id": "RHSA-2003:296",
"initial_release_date": "2003-11-24T08:44:00+00:00",
"revision_history": [
{
"date": "2003-11-24T08:44:00+00:00",
"number": "1",
"summary": "Initial version"
},
{
"date": "2003-11-24T00:00:00+00:00",
"number": "2",
"summary": "Last updated version"
},
{
"date": "2024-11-21T22:52:09+00:00",
"number": "3",
"summary": "Last generated version"
}
],
"status": "final",
"version": "3"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "Red Hat Linux 7.1",
"product": {
"name": "Red Hat Linux 7.1",
"product_id": "Red Hat Linux 7.1",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:linux:7.1"
}
}
},
{
"category": "product_name",
"name": "Red Hat Linux 7.2",
"product": {
"name": "Red Hat Linux 7.2",
"product_id": "Red Hat Linux 7.2",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:linux:7.2"
}
}
},
{
"category": "product_name",
"name": "Red Hat Linux 7.3",
"product": {
"name": "Red Hat Linux 7.3",
"product_id": "Red Hat Linux 7.3",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:linux:7.3"
}
}
},
{
"category": "product_name",
"name": "Red Hat Linux 8.0",
"product": {
"name": "Red Hat Linux 8.0",
"product_id": "Red Hat Linux 8.0",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:linux:8.0"
}
}
}
],
"category": "product_family",
"name": "Red Hat Linux"
}
],
"category": "vendor",
"name": "Red Hat"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2002-1563",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1616922"
}
],
"notes": [
{
"category": "description",
"text": "stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "security flaw",
"title": "Vulnerability summary"
}
],
"product_status": {
"fixed": [
"Red Hat Linux 7.1",
"Red Hat Linux 7.2",
"Red Hat Linux 7.3",
"Red Hat Linux 8.0"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2002-1563"
},
{
"category": "external",
"summary": "RHBZ#1616922",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1616922"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2002-1563",
"url": "https://www.cve.org/CVERecord?id=CVE-2002-1563"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2002-1563",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2002-1563"
}
],
"release_date": "2002-10-30T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2003-11-24T08:44:00+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nTo update all RPMs for your particular architecture, run:\n\nrpm -Fvh [filenames]\n\nwhere [filenames] is a list of the RPMs you wish to upgrade. Only those\nRPMs which are currently installed will be updated. Those RPMs which are\nnot installed but included in the list will not be updated. Note that you\ncan also use wildcards (*.rpm) if your current directory *only* contains the\ndesired RPMs.\n\nPlease note that this update is also available via Red Hat Network. Many\npeople find this an easier way to apply updates. To use Red Hat Network,\nlaunch the Red Hat Update Agent with the following command:\n\nup2date\n\nThis will start an interactive process that will result in the appropriate\nRPMs being upgraded on your system.\n\nIf up2date fails to connect to Red Hat Network due to SSL Certificate \nErrors, you need to install a version of the up2date client with an updated \ncertificate. The latest version of up2date is available from the Red Hat \nFTP site and may also be downloaded directly from the RHN website:\n\nhttps://rhn.redhat.com/help/latest-up2date.pxt",
"product_ids": [
"Red Hat Linux 7.1",
"Red Hat Linux 7.2",
"Red Hat Linux 7.3",
"Red Hat Linux 8.0"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2003:296"
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "security flaw"
},
{
"cve": "CVE-2003-0740",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1617077"
}
],
"notes": [
{
"category": "description",
"text": "Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows local users to hijack the Stunnel server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "security flaw",
"title": "Vulnerability summary"
}
],
"product_status": {
"fixed": [
"Red Hat Linux 7.1",
"Red Hat Linux 7.2",
"Red Hat Linux 7.3",
"Red Hat Linux 8.0"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2003-0740"
},
{
"category": "external",
"summary": "RHBZ#1617077",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1617077"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2003-0740",
"url": "https://www.cve.org/CVERecord?id=CVE-2003-0740"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2003-0740",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2003-0740"
}
],
"release_date": "2003-09-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2003-11-24T08:44:00+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nTo update all RPMs for your particular architecture, run:\n\nrpm -Fvh [filenames]\n\nwhere [filenames] is a list of the RPMs you wish to upgrade. Only those\nRPMs which are currently installed will be updated. Those RPMs which are\nnot installed but included in the list will not be updated. Note that you\ncan also use wildcards (*.rpm) if your current directory *only* contains the\ndesired RPMs.\n\nPlease note that this update is also available via Red Hat Network. Many\npeople find this an easier way to apply updates. To use Red Hat Network,\nlaunch the Red Hat Update Agent with the following command:\n\nup2date\n\nThis will start an interactive process that will result in the appropriate\nRPMs being upgraded on your system.\n\nIf up2date fails to connect to Red Hat Network due to SSL Certificate \nErrors, you need to install a version of the up2date client with an updated \ncertificate. The latest version of up2date is available from the Red Hat \nFTP site and may also be downloaded directly from the RHN website:\n\nhttps://rhn.redhat.com/help/latest-up2date.pxt",
"product_ids": [
"Red Hat Linux 7.1",
"Red Hat Linux 7.2",
"Red Hat Linux 7.3",
"Red Hat Linux 8.0"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2003:296"
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "security flaw"
}
]
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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