rhsa-2021_1811
Vulnerability from csaf_redhat
Published
2021-05-18 14:20
Modified
2024-11-22 15:59
Summary
Red Hat Security Advisory: libvncserver security update
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.
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"title": "libvncserver: uninitialized memory contents are vulnerable to Information Leak"
},
{
"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": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1849877"
}
],
"notes": [
{
"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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"category": "external",
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-20839",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20839"
}
],
"release_date": "2020-06-17T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2021-05-18T14:20:40+00:00",
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"title": "Vulnerability description"
},
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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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},
{
"category": "external",
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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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"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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{
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}
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"title": "libvncserver: libvncclient/rfbproto.c does not limit TextChat size"
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{
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"names": [
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"ids": [
{
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"text": "1896739"
}
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{
"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"
}
]
}
Loading…
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.