RHSA-2021_1811
Vulnerability from csaf_redhat - Published: 2021-05-18 14:20 - Updated: 2024-11-22 15:59Summary
Red Hat Security Advisory: libvncserver security update
Severity
Moderate
Notes
Topic: An update for libvncserver is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
* libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
* libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
* libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
* libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.
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.
An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:1811
libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:1811
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:1811
An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size.
6.5 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:1811
A divide by zero flaw was found in libvncserver. This flaw allows a malicious client to send a specially crafted message that, when processed by the VNC server, leads to a floating-point exception, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:1811
References
Acknowledgments
Hui Huang
Kailong Zhu
Lu Yu
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"text": "libvncserver: uninitialized memory contents are vulnerable to Information Leak",
"title": "Vulnerability summary"
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{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-21247"
}
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"title": "libvncserver: uninitialized memory contents are vulnerable to Information Leak"
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{
"cve": "CVE-2019-20839",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
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"ids": [
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{
"category": "description",
"text": "libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libvncserver: buffer overflow in ConnectClientToUnixSock()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is only an issue if the \"ConnectClientToUnixSock()\" function is used directly with an overly long socket name. It\u0027s more common that the \"ConnectToRFBServer()\" function is used, which would prevent exploiting this flaw as it performs additional checks. Additionally, the buffer overflow is caught by compiled-in buffer overflow checks, limiting the impact to a crash.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
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"title": "Vulnerability description"
},
{
"category": "summary",
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"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2020-14397"
},
{
"category": "external",
"summary": "RHBZ#1860344",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1860344"
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2020-14397"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-14397",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14397"
}
],
"release_date": "2020-06-17T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-05-18T14:20:40+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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{
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},
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}
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"confidentialityImpact": "NONE",
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"scope": "UNCHANGED",
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"title": "libvncserver: libvncclient/rfbproto.c does not limit TextChat size"
},
{
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"names": [
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"name": "Divide By Zero"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1896739"
}
],
"notes": [
{
"category": "description",
"text": "A divide by zero flaw was found in libvncserver. This flaw allows a malicious client to send a specially crafted message that, when processed by the VNC server, leads to a floating-point exception, resulting in a denial of service. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:1811"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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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