The remote NewStart CGSL host, running version MAIN 6.02, has libX11 packages installed that are affected by a vulnerability:

  - 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. (CVE-2021-31535)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

New libX11 packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix a security issue.

This update for libX11 fixes the following issues :

CVE-2021-31535: Fixed missing request length checks in libX11 (bsc#1182506).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote SUSE Linux SLED15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2021:1897-1 advisory.

  - 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. (CVE-2021-31535)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update for libX11 fixes the following issues :

  - Regression in the fix for CVE-2021-31535, causing     segfaults for xforms applications like fdesign     (bsc#1186643)

This update was imported from the SUSE:SLE-15:Update update project.

The remote SUSE Linux SLES11 / SLES_SAP11 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2021:14748-1 advisory.

  - 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. (CVE-2021-31535)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:3296 advisory.

    The libX11 packages contain the core X11 protocol client library.

    Security Fix(es):

    * libX11: missing request length checks (CVE-2021-31535)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-3296 advisory.

    [1.6.7-4]
    - Fix CVE-2021-31535 (#1962438)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the version of the libX11 packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - Core X11 protocol client library.Security     Fix(es):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.(CVE-2021-31535)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-4326 advisory.

    [1.6.8-5]
    - Fix CVE-2021-31535 (#1962439)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the libX11 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - 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. (CVE-2021-31535)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017540 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
167487	NewStart CGSL MAIN 6.02 : libX11 Vulnerability (NS-SA-2022-0090)	Nessus	NewStart CGSL Local Security Checks	2022/11/15	2022/11/16	critical
149799	Slackware 14.0 / 14.1 / 14.2 / current : libX11 (SSA:2021-139-01)	Nessus	Slackware Local Security Checks	2021/5/20	2021/6/14	critical
150012	SUSE SLES12 Security Update : libX11 (SUSE-SU-2021:1766-1)	Nessus	SuSE Local Security Checks	2021/5/27	2022/1/26	critical
150018	SUSE SLED15 / SLES15 Security Update : libX11 (SUSE-SU-2021:1765-1)	Nessus	SuSE Local Security Checks	2021/5/27	2022/1/26	critical
150415	SUSE SLED15 / SLES15 Security Update : libX11 (SUSE-SU-2021:1897-1)	Nessus	SuSE Local Security Checks	2021/6/9	2023/7/13	critical
150457	openSUSE Security Update : libX11 (openSUSE-2021-857)	Nessus	SuSE Local Security Checks	2021/6/10	2021/6/14	critical
150874	SUSE SLES11 Security Update : xorg-x11-libX11 (SUSE-SU-2021:14748-1)	Nessus	SuSE Local Security Checks	2021/6/21	2023/7/13	critical
152906	RHEL 7 : libX11 (RHSA-2021:3296)	Nessus	Red Hat Local Security Checks	2021/8/30	2024/11/7	critical
152907	Oracle Linux 7 : libX11 (ELSA-2021-3296)	Nessus	Oracle Linux Local Security Checks	2021/8/30	2024/11/1	critical
153347	EulerOS 2.0 SP2 : libX11 (EulerOS-SA-2021-2405)	Nessus	Huawei Local Security Checks	2021/9/14	2023/11/30	critical
155415	Oracle Linux 8 : libX11 (ELSA-2021-4326)	Nessus	Oracle Linux Local Security Checks	2021/11/17	2024/11/1	critical
157997	EulerOS Virtualization 3.0.6.6 : libX11 (EulerOS-SA-2022-1126)	Nessus	Huawei Local Security Checks	2022/2/13	2022/2/14	critical
313812	Unity Linux 20.1060e / 20.1070e Security Update: libX11 (UTSA-2026-017540)	Nessus	Unity Linux Local Security Checks	2026/5/11	2026/5/11	critical

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