Vulnerability Details : CVE-2021-31535
LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.
Vulnerability category: OverflowExecute code
Products affected by CVE-2021-31535
- cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*
- cpe:2.3:o:x.org:x_window_system:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31535
11.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 95 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31535
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-31535
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The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-31535
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http://seclists.org/fulldisclosure/2021/May/52
Full Disclosure: CVE-2021-31535 libX11 Insufficient Length Checks PoC and ArcheologyMailing List;Third Party Advisory
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https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc@%3Cdev.kafka.apache.org%3E
Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image - Pony MailMailing List;Third Party Advisory
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https://www.openwall.com/lists/oss-security/2021/05/18/3
oss-security - libx11 API Protocol Command InjectionMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2021/05/18/2
oss-security - libX11 security advisory: May 18, 2021Mailing List;Third Party Advisory
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https://lists.x.org/archives/xorg-announce/2021-May/003088.html
libX11 security advisory: May 11, 2021Vendor Advisory
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https://security.gentoo.org/glsa/202105-16
X.Org X11 library: Denial of service (GLSA 202105-16) — Gentoo securityThird Party Advisory
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https://lists.freedesktop.org/archives/xorg/
The xorg ArchivesThird Party Advisory
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https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605
Reject string longer than USHRT_MAX before sending them on the wire (8d2e02ae) · Commits · xorg / lib / libX11 · GitLabThird Party Advisory
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https://www.openwall.com/lists/oss-security/2021/05/18/2
oss-security - libX11 security advisory: May 18, 2021Mailing List;Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/
[SECURITY] Fedora 33 Update: libX11-1.7.2-3.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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https://www.debian.org/security/2021/dsa-4920
Debian -- Security Information -- DSA-4920-1 libx11Third Party Advisory
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http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html
libX11 Insufficient Length Check / Injection ≈ Packet StormExploit;Third Party Advisory;VDB Entry
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https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7@%3Cdev.kafka.apache.org%3E
Re: [EXTERNAL] Re: Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image - Pony MailMailing List;Third Party Advisory
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https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/
Using Xterm to Navigate the Huge Color SpaceExploit;Third Party Advisory
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https://security.netapp.com/advisory/ntap-20210813-0001/
CVE-2021-31535 X.Org X Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt
Exploit;Third Party Advisory
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https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc@%3Cusers.kafka.apache.org%3E
Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image - Pony MailMailing List;Third Party Advisory
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https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7@%3Cusers.kafka.apache.org%3E
Re: [EXTERNAL] Re: Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image - Pony MailMailing List;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html
[SECURITY] [DLA 2666-1] libx11 security updateThird Party Advisory
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