Several issues have been found in xorg-server, the X server from xorg.
Basically all issues are out-of-bounds access or integer underflows in different request handlers. One CVE is about a leak of uninitialize heap memory to clients.

For Debian 9 stretch, these problems have been fixed in version 2:1.19.2-1+deb9u6.

We recommend that you upgrade your xorg-server packages.

For the detailed security status of xorg-server please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/xorg-server

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

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4488-1 advisory.

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the input extension protocol. A     local attacker could possibly use this issue to escalate privileges. (CVE-2020-14346)

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly initialized memory. A local attacker could     possibly use this issue to obtain sensitive information. (CVE-2020-14347)

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the XkbSelectEvents function. A     local attacker could possibly use this issue to escalate privileges. (CVE-2020-14361)

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the XRecordRegisterClients     function. A local attacker could possibly use this issue to escalate privileges. (CVE-2020-14362)

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

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

Several vulnerabilities have been discovered in the X.Org X server.
Missing input sanitising in X server extensions may result in local privilege escalation if the X server is configured to run with root privileges. In addition an ASLR bypass was fixed.

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-4953 advisory.

    [1.17.4-18.0.1]
    - Fix regression from the patch for Orabug 27204421 which crashes Xvfb [Orabug: 28485058]
    - Fix X consumes 100% CPU if messagebus restarted [Orabug: 27204421]
    - Fix X server failure in FIPS mode [Orabug: 22866111]

    [1.17.4-18]
    - CVE fixes for: CVE-2020-14345 (#1872388), CVE-2020-14346 (#1872392),       CVE-2020-14361 (#1872399), CVE-2020-14362 (#1872406)

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

Note that Nessus has not tested for these issues 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 multiple vulnerabilities as referenced in the RHSA-2020:4910 advisory.

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14346)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14361,     CVE-2020-14362)

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

The remote CentOS Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4953 advisory.

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14346)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14361,     CVE-2020-14362)

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1475 advisory.

    A flaw was found in X.Org Server. An Out-Of-Bounds access in XkbSetNames function may lead to a privilege     escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and     integrity as well as system availability. (CVE-2020-14345)

    A flaw was found in xorg-x11-server. A integer underflow in the X input extension protocol decoding in the     X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to     data confidentiality and integrity as well as system availability. (CVE-2020-14346)

    A flaw was found in X.Org Server. An Integer underflow leading to heap-buffer overflow may lead to a     privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality     and integrity as well as system availability. (CVE-2020-14361)

    A flaw was found in X.Org Server. An Integer underflow leading to heap-buffer overflow may lead to a     privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality     and integrity as well as system availability. (CVE-2020-14362)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

This update for xorg-x11-server fixes the following issues :

CVE-2020-14347: Leak of uninitialized heap memory from the X server to clients on pixmap allocation (bsc#1174633, ZDI-CAN-11426).

CVE-2020-14346: XIChangeHierarchy Integer Underflow Privilege Escalation Vulnerability (bsc#1174638, ZDI-CAN-11429).

CVE-2020-14345: XKB out-of-bounds access privilege escalation vulnerability (bsc#1174635, ZDI-CAN-11428).

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 NewStart CGSL host, running version MAIN 6.06, has xorg-x11-server packages installed that are affected by multiple vulnerabilities:

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty     request has a length-validation issues, resulting in out-of-bounds memory reads and potential information     disclosure. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions. (CVE-2022-46344)

  - A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access     can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2021-4011)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14346)

  - A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable. (CVE-2020-14347)

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

According to the versions of the xorg-x11-server packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in the X.Org Server. An out-of-bounds     access in the XkbSetMap function may lead to a     privilege escalation vulnerability. The highest threat     from this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-14360)

  - A flaw was found in xorg-x11-server before 1.20.10. A     heap-buffer overflow in XkbSetDeviceInfo may lead to a     privilege escalation vulnerability. The highest threat     from this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-25712)

  - A flaw was found in the way xserver memory was not     properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs     with elevated privileges, this could result in possible     ASLR bypass. Xorg-server before version 1.20.9 is     vulnerable.(CVE-2020-14347)

  - A flaw was found in X.Org Server before xorg-x11-server     1.20.9. An Out-Of-Bounds access in XkbSetNames function     may lead to a privilege escalation vulnerability. The     highest threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An     integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access     of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity     as well as system availability.(CVE-2020-14346)

  - A flaw was found in X.Org Server before xorg-x11-server     1.20.9. An Integer underflow leading to heap-buffer     overflow may lead to a privilege escalation     vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity     as well as system availability.(CVE-2020-14361)

  - A flaw was found in X.Org Server before xorg-x11-server     1.20.9. An Integer underflow leading to heap-buffer     overflow may lead to a privilege escalation     vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity     as well as system availability.(CVE-2020-14362)

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 multiple vulnerabilities as referenced in the ELSA-2021-1804 advisory.

    - Fix CVE-2020-14363 (#1873923)

    mesa
    - CVE fix for: CVE-2020-14347 (#1862320)
    - CVE fixes for: CVE-2020-14345 (#1872391), CVE-2020-14346 (#1872395),       CVE-2020-14361 (#1872402), CVE-2020-14362 (#1872409)

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

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

The remote NewStart CGSL host, running version MAIN 6.02, has xorg-x11-server packages installed that are affected by multiple vulnerabilities:

  - An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was     implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid     programs call XIM client functions while running with elevated privileges. No such programs are shipped     with Red Hat Enterprise Linux. (CVE-2020-14344)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14346)

  - A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable. (CVE-2020-14347)

  - A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14360)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14361,     CVE-2020-14362)

  - An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local     privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in     arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as     system availability. (CVE-2020-14363)

  - A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to     a privilege escalation vulnerability. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2020-25712)

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

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:1804 advisory.

  - An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was     implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid     programs call XIM client functions while running with elevated privileges. No such programs are shipped     with Red Hat Enterprise Linux. (CVE-2020-14344)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14346)

  - A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable. (CVE-2020-14347)

  - A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14360)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14361,     CVE-2020-14362)

  - An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local     privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in     arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as     system availability. (CVE-2020-14363)

  - A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to     a privilege escalation vulnerability. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2020-25712)

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

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

  - An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was     implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid     programs call XIM client functions while running with elevated privileges. No such programs are shipped     with Red Hat Enterprise Linux. (CVE-2020-14344)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14345)

  - A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14346)

  - A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable. (CVE-2020-14347)

  - A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability. (CVE-2020-14360)

  - A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14361,     CVE-2020-14362)

  - An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local     privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in     arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as     system availability. (CVE-2020-14363)

  - A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to     a privilege escalation vulnerability. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2020-25712)

Note that Nessus has not tested for these issues 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
140058	Debian DLA-2359-1 : xorg-server security update	Nessus	Debian Local Security Checks	2020/8/31	2020/9/17	high
140267	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : X.Org X Server vulnerabilities (USN-4488-1)	Nessus	Ubuntu Local Security Checks	2020/9/4	2024/8/29	high
140299	Debian DSA-4758-1 : xorg-server - security update	Nessus	Debian Local Security Checks	2020/9/8	2020/9/17	high
142488	Oracle Linux 6 : xorg-x11-server (ELSA-2020-4953)	Nessus	Oracle Linux Local Security Checks	2020/11/6	2024/10/23	high
142607	CentOS 7 : xorg-x11-server (RHSA-2020:4910)	Nessus	CentOS Local Security Checks	2020/11/6	2024/10/9	high
142644	CentOS 6 : xorg-x11-server (RHSA-2020:4953)	Nessus	CentOS Local Security Checks	2020/11/9	2024/10/9	high
144991	Amazon Linux AMI : xorg-x11-server (ALAS-2021-1475)	Nessus	Amazon Linux Local Security Checks	2021/1/14	2024/12/11	high
139835	SUSE SLED15 / SLES15 Security Update : xorg-x11-server (SUSE-SU-2020:2240-1)	Nessus	SuSE Local Security Checks	2020/8/26	2021/1/13	high
139846	SUSE SLES12 Security Update : xorg-x11-server (SUSE-SU-2020:2325-1)	Nessus	SuSE Local Security Checks	2020/8/26	2020/9/17	high
139905	SUSE SLES12 Security Update : xorg-x11-server (SUSE-SU-2020:2331-1)	Nessus	SuSE Local Security Checks	2020/8/27	2021/1/13	high
266275	NewStart CGSL MAIN 6.06 : xorg-x11-server Multiple Vulnerabilities (NS-SA-2025-0235)	Nessus	NewStart CGSL Local Security Checks	2025/9/30	2025/9/30	high
145118	EulerOS 2.0 SP3 : xorg-x11-server (EulerOS-SA-2021-1132)	Nessus	Huawei Local Security Checks	2021/1/20	2024/1/29	high
149948	Oracle Linux 8 : userspace / graphics, / xorg-x11, / and / mesa (ELSA-2021-1804)	Nessus	Oracle Linux Local Security Checks	2021/5/26	2024/11/1	high
160787	NewStart CGSL MAIN 6.02 : xorg-x11-server Multiple Vulnerabilities (NS-SA-2022-0049)	Nessus	NewStart CGSL Local Security Checks	2022/5/9	2023/10/30	high
184506	Rocky Linux 8 : userspace graphics, xorg-x11, and mesa (RLSA-2021:1804)	Nessus	Rocky Linux Local Security Checks	2023/11/6	2023/11/6	high
160742	NewStart CGSL MAIN 6.02 : libX11 Multiple Vulnerabilities (NS-SA-2022-0056)	Nessus	NewStart CGSL Local Security Checks	2022/5/9	2023/10/30	high

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