The version of libX11 installed on the remote host is prior to 1.6.7-3. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2021-1686 advisory.

    A missing validation flaw was found in libX11. This flaw allows an attacker to inject X11 protocol     commands on X clients, and in some cases, also bypass, authenticate (via injection of control characters),     or potentially execute arbitrary code with permissions of the application compiled with libX11. The     highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
    (CVE-2021-31535)

Tenable has extracted the preceding description block directly from the tested product 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 CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:3296 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.

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.

According to the versions of the libX11 package installed, the EulerOS 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.

According to the versions of the libX11 package 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.

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 remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, 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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 relies on the presence of the package as reported by the vendor.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
151795	Amazon Linux 2 : libX11 (ALAS-2021-1686)	Nessus	Amazon Linux Local Security Checks	2021/7/16	2024/12/11	critical
152909	CentOS 7 : libX11 (RHSA-2021:3296)	Nessus	CentOS Local Security Checks	2021/8/30	2024/10/9	critical
153347	EulerOS 2.0 SP2 : libX11 (EulerOS-SA-2021-2405)	Nessus	Huawei Local Security Checks	2021/9/14	2023/11/30	critical
153707	EulerOS 2.0 SP9 : libX11 (EulerOS-SA-2021-2558)	Nessus	Huawei Local Security Checks	2021/9/27	2022/1/20	critical
155512	EulerOS Virtualization 2.9.1 : libX11 (EulerOS-SA-2021-2744)	Nessus	Huawei Local Security Checks	2021/11/17	2022/4/18	critical
157954	EulerOS Virtualization 3.0.6.0 : libX11 (EulerOS-SA-2022-1072)	Nessus	Huawei Local Security Checks	2022/2/12	2022/2/14	critical
160745	NewStart CGSL CORE 5.04 / MAIN 5.04 : libX11 Vulnerability (NS-SA-2022-0013)	Nessus	NewStart CGSL Local Security Checks	2022/5/9	2022/5/10	critical
223923	Linux Distros Unpatched Vulnerability : CVE-2021-31535	Nessus	Misc.	2025/3/5	2025/8/19	critical

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