xorg-x11-server before 1.19.5 was missing length validation in MIT-SCREEN-SAVER extension allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - xorg-x11-server: unvalidated lengths in RENDER extension (CVE-2017-12187)

  - The ProcPutImage function in dix/dispatch.c in X.Org Server (aka xserver and xorg-server) before 1.16.4     allows attackers to cause a denial of service (divide-by-zero and crash) via a zero-height PutImage     request. (CVE-2015-3418)

  - In the X.Org X server before 2017-06-19, a user authenticated to an X Session could crash or execute code     in the context of the X Server by exploiting a stack overflow in the endianness conversion of X Events.
    (CVE-2017-10971)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - xorg-x11-server: unvalidated lengths in RENDER extension (CVE-2017-12187)

  - In the X.Org X server before 2017-06-19, a user authenticated to an X Session could crash or execute code     in the context of the X Server by exploiting a stack overflow in the endianness conversion of X Events.
    (CVE-2017-10971)

  - Uninitialized data in endianness conversion in the XEvent handling of the X.Org X Server before 2017-06-19     allowed authenticated malicious users to access potentially privileged data from the X server.
    (CVE-2017-10972)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - xorg-x11-server: unvalidated lengths in RENDER extension (CVE-2017-12187)

  - X.Org Server (aka xserver and xorg-server) before 1.16.3 and 1.17.x before 1.17.1 allows remote attackers     to obtain sensitive information from process memory or cause a denial of service (crash) via a crafted     string length value in a XkbSetGeometry request. (CVE-2015-0255)

  - The ProcPutImage function in dix/dispatch.c in X.Org Server (aka xserver and xorg-server) before 1.16.4     allows attackers to cause a denial of service (divide-by-zero and crash) via a zero-height PutImage     request. (CVE-2015-3418)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

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 xorg-x11-server before 1.20.3. An     incorrect permission check for -modulepath and -logfile     options when starting Xorg. X server allows     unprivileged users with the ability to log in to the     system via physical console to escalate their     privileges and run arbitrary code under root     privileges.(CVE-2018-14665)

  - In the X.Org X server before 2017-06-19, a user     authenticated to an X Session could crash or execute     code in the context of the X Server by exploiting a     stack overflow in the endianness conversion of X     Events.(CVE-2017-10971)

  - In X.Org Server (aka xserver and xorg-server) before     1.19.4, an attacker authenticated to an X server with     the X shared memory extension enabled can cause aborts     of the X server or replace shared memory segments of     other X clients in the same session.(CVE-2017-13721)

  - It was found that xorg-x11-server before 1.19.0     including uses memcmp() to check the received MIT     cookie against a series of valid cookies. If the cookie     is correct, it is allowed to attach to the Xorg     session. Since most memcmp() implementations return     after an invalid byte is seen, this causes a time     difference between a valid and invalid byte, which     could allow an efficient brute force     attack.(CVE-2017-2624)

  - Uninitialized data in endianness conversion in the     XEvent handling of the X.Org X Server before 2017-06-19     allowed authenticated malicious users to access     potentially privileged data from the X     server.(CVE-2017-10972)

  - xorg-x11-server before 1.19.5 had wrong extra length     check in ProcXIChangeHierarchy function allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12178)

  - xorg-x11-server before 1.19.5 was missing extra length     validation in ProcEstablishConnection function allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12176)

  - xorg-x11-server before 1.19.5 was missing length     validation in MIT-SCREEN-SAVER extension allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12185)

  - xorg-x11-server before 1.19.5 was missing length     validation in RENDER extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12187)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFIXES extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12183)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFree86 DGA extension allowing malicious     X client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12181)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFree86 DRI extension allowing malicious     X client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12182)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFree86 VidModeExtension allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12180)

  - xorg-x11-server before 1.19.5 was missing length     validation in XINERAMA extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12184)

  - xorg-x11-server before 1.19.5 was missing length     validation in X-Resource extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12186)

  - xorg-x11-server before 1.19.5 was vulnerable to integer     overflow in (S)ProcXIBarrierReleasePointer functions     allowing malicious X client to cause X server to crash     or possibly execute arbitrary code.(CVE-2017-12179)

  - xorg-x11-server before 1.19.5 was vulnerable to integer     overflow in ProcDbeGetVisualInfo function allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12177)

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

  - xorg-x11-server before 1.19.5 was vulnerable to integer     overflow in ProcDbeGetVisualInfo function allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12177)

  - xorg-x11-server before 1.19.5 had wrong extra length     check in ProcXIChangeHierarchy function allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12178)

  - xorg-x11-server before 1.19.5 was vulnerable to integer     overflow in (S)ProcXIBarrierReleasePointer functions     allowing malicious X client to cause X server to crash     or possibly execute arbitrary code.(CVE-2017-12179)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFree86 VidModeExtension allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12180)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFree86 DGA extension allowing malicious     X client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12181)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFree86 DRI extension allowing malicious     X client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12182)

  - xorg-x11-server before 1.19.5 was missing length     validation in XFIXES extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12183)

  - xorg-x11-server before 1.19.5 was missing length     validation in XINERAMA extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12184)

  - xorg-x11-server before 1.19.5 was missing length     validation in MIT-SCREEN-SAVER extension allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12185)

  - xorg-x11-server before 1.19.5 was missing length     validation in X-Resource extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12186)

  - xorg-x11-server before 1.19.5 was missing length     validation in RENDER extension allowing malicious X     client to cause X server to crash or possibly execute     arbitrary code.(CVE-2017-12187)

  - In X.Org Server (aka xserver and xorg-server) before     1.19.4, an attacker authenticated to an X server with     the X shared memory extension enabled can cause aborts     of the X server or replace shared memory segments of     other X clients in the same session.(CVE-2017-13721)

  - It was found that xorg-x11-server before 1.19.0     including uses memcmp() to check the received MIT     cookie against a series of valid cookies. If the cookie     is correct, it is allowed to attach to the Xorg     session. Since most memcmp() implementations return     after an invalid byte is seen, this causes a time     difference between a valid and invalid byte, which     could allow an efficient brute force     attack.(CVE-2017-2624)

  - A flaw was found in xorg-x11-server before 1.20.3. An     incorrect permission check for -modulepath and -logfile     options when starting Xorg. X server allows     unprivileged users with the ability to log in to the     system via physical console to escalate their     privileges and run arbitrary code under root     privileges.(CVE-2018-14665)

  - In the X.Org X server before 2017-06-19, a user     authenticated to an X Session could crash or execute     code in the context of the X Server by exploiting a     stack overflow in the endianness conversion of X     Events.(CVE-2017-10971)

  - Uninitialized data in endianness conversion in the     XEvent handling of the X.Org X Server before 2017-06-19     allowed authenticated malicious users to access     potentially privileged data from the X     server.(CVE-2017-10972)

  - xorg-x11-server before 1.19.5 was missing extra length     validation in ProcEstablishConnection function allowing     malicious X client to cause X server to crash or     possibly execute arbitrary code.(CVE-2017-12176)

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.

This update for xorg-x11-server fixes several issues. These security issues were fixed :

  - CVE-2017-13721: Missing validation of shmseg resource id     in Xext/XShm could lead to shared memory segments of     other users beeing freed (bnc#1052984)

  - CVE-2017-13723: A local denial of service via unusual     characters in XkbAtomText and XkbStringText was fixed     (bnc#1051150)

  -     CVE-2017-12184,CVE-2017-12185,CVE-2017-12186,CVE-2017-12     187: Fixed unvalidated lengths in multiple extensions     (bsc#1063034)

  - CVE-2017-12183: Fixed some unvalidated lengths in the     XFIXES extension. (bsc#1063035)

  - CVE-2017-12180,CVE-2017-12181,CVE-2017-12182: Fixed     various unvalidated lengths in the     XFree86-VidMode/XFree86-DGA/XFree86-DRI extensions     (bsc#1063037)

  - CVE-2017-12179: Fixed an integer overflow and     unvalidated length in (S)ProcXIBarrierReleasePointer in     Xi (bsc#1063038)

  - CVE-2017-12178: Fixed a wrong extra length check in     ProcXIChangeHierarchy in Xi (bsc#1063039)

  - CVE-2017-12177: Fixed an unvalidated variable-length     request in ProcDbeGetVisualInfo (bsc#1063040)

  - CVE-2017-12176: Fixed an unvalidated extra length in     ProcEstablishConnection (bsc#1063041)

The update package also includes non-security fixes. See advisory for details.

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.

Several vulnerabilities have been discovered in the X.Org X server. An attacker who's able to connect to an X server could cause a denial of service or potentially the execution of arbitrary code.

For Debian 7 'Wheezy', these problems have been fixed in version 2:1.12.4-6+deb7u8.

We recommend that you upgrade your xorg-server packages.

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.

This update for xorg-x11-server provides several fixes. These security issues were fixed :

  - CVE-2017-13723: Prevent local DoS via unusual characters     in XkbAtomText and XkbStringText (bsc#1051150).

  - Improve the entropy when generating random data used in     X.org server authorization cookies generation by using     getentropy() and getrandom() when available     (bsc#1025084)

  -     CVE-2017-12184,CVE-2017-12185,CVE-2017-12186,CVE-2017-12     187: Fixed unvalidated lengths in multiple extensions     (bsc#1063034)

  - CVE-2017-12183: Fixed some unvalidated lengths in the     XFIXES extension. (bsc#1063035)

  - CVE-2017-12180,CVE-2017-12181,CVE-2017-12182: Fixed     various unvalidated lengths in the     XFree86-VidMode/XFree86-DGA/XFree86-DRI extensions     (bsc#1063037)

  - CVE-2017-12179: Fixed an integer overflow and     unvalidated length in (S)ProcXIBarrierReleasePointer in     Xi (bsc#1063038)

  - CVE-2017-12178: Fixed a wrong extra length check in     ProcXIChangeHierarchy in Xi (bsc#1063039)

  - CVE-2017-12177: Fixed an unvalidated variable-length     request in ProcDbeGetVisualInfo (bsc#1063040)

  - CVE-2017-12176: Fixed an unvalidated extra length in     ProcEstablishConnection (bsc#1063041)

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.

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

  - CVE-2017-12176: Unvalidated extra length in     ProcEstablishConnection (bsc#1063041)

  - CVE-2017-12177: dbe: Unvalidated variable-length request     in ProcDbeGetVisualInfo (bsc#1063040)

  - CVE-2017-12178: Xi: fix wrong extra length check in     ProcXIChangeHierarchy (bsc#1063039)

  - CVE-2017-12179: Xi: integer overflow and unvalidated     length in (S)ProcXIBarrierReleasePointer (bsc#1063038)

  - CVE-2017-12180,CVE-2017-12181,CVE-2017-12182:
    Unvalidated lengths in     XFree86-VidMode/XFree86-DGA/XFree86-DRI extension     (bsc#1063037)

  - CVE-2017-12183: Unvalidated lengths in XFIXES extension     (bsc#1063035)

  -     CVE-2017-12184,CVE-2017-12185,CVE-2017-12186,CVE-2017-12     187: Unvalidated lengths in multiple extensions     (bsc#1063034)

New xorg-server packages are available for Slackware 14.0, 14.1, 14.2, and -current to fix security issues.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3456-1 advisory.

    It was discovered that the X.Org X server incorrectly handled certain lengths. An attacker able to connect     to an X server, either locally or remotely, could use these issues to crash the server, or possibly     execute arbitrary code.

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. An attacker who's able to connect to an X server could cause a denial of service or potentially the execution of arbitrary code.

Adam Jackson reports :

One regression fix since 1.19.4 (mea culpa), and fixes for CVEs 2017-12176 through 2017-12187.

ID	Name	Product	Family	Severity
198556	RHEL 7 : xorg-x11-server (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198504	RHEL 6 : xorg-x11-server (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198467	RHEL 5 : xorg-x11-server (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
132218	EulerOS 2.0 SP3 : xorg-x11-server (EulerOS-SA-2019-2683)	Nessus	Huawei Local Security Checks	critical
131913	EulerOS 2.0 SP2 : xorg-x11-server (EulerOS-SA-2019-2421)	Nessus	Huawei Local Security Checks	critical
104776	SUSE SLED12 / SLES12 Security Update : xorg-x11-server (SUSE-SU-2017:3047-1)	Nessus	SuSE Local Security Checks	critical
104745	Debian DLA-1186-1 : xorg-server security update	Nessus	Debian Local Security Checks	critical
104651	SUSE SLES11 Security Update : xorg-x11-server (SUSE-SU-2017:3025-1)	Nessus	SuSE Local Security Checks	critical
104081	openSUSE Security Update : xorg-x11-server (openSUSE-2017-1177)	Nessus	SuSE Local Security Checks	critical
103945	Slackware 14.0 / 14.1 / 14.2 / current : xorg-server (SSA:2017-291-03)	Nessus	Slackware Local Security Checks	critical
103921	Ubuntu 14.04 LTS / 16.04 LTS : X.Org X server vulnerabilities (USN-3456-1)	Nessus	Ubuntu Local Security Checks	critical
103882	Debian DSA-4000-1 : xorg-server - security update	Nessus	Debian Local Security Checks	critical
103842	FreeBSD : xorg-server -- multiple vulnabilities (7274e0cc-575f-41bc-8619-14a41b3c2ad0)	Nessus	FreeBSD Local Security Checks	critical

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CVE-2017-12185

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