Multiple integer overflow flaws and out-of-bounds write flaws were found in the way the X.Org server calculated memory requirements for certain X11 core protocol and GLX extension requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server or, potentially, execute arbitrary code with root privileges. (CVE-2014-8092 , CVE-2014-8093 , CVE-2014-8098)

It was found that the X.Org server did not properly handle SUN-DES-1 (Secure RPC) authentication credentials. A malicious, unauthenticated client could use this flaw to crash the X.Org server by submitting a specially crafted authentication request. (CVE-2014-8091)

Multiple out-of-bounds access flaws were found in the way the X.Org server calculated memory requirements for certain requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server, or leak memory contents to the client.
(CVE-2014-8097)

An integer overflow flaw was found in the way the X.Org server calculated memory requirements for certain DRI2 extension requests. A malicious, authenticated client could use this flaw to crash the X.Org server. (CVE-2014-8094)

Multiple out-of-bounds access flaws were found in the way the X.Org server calculated memory requirements for certain requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server. (CVE-2014-8095 , CVE-2014-8096 , CVE-2014-8099 , CVE-2014-8100 , CVE-2014-8101 , CVE-2014-8102 , CVE-2014-8103)

Ilja van Sprundel of IOActive discovered several security issues in the X.org X server, which may lead to privilege escalation or denial of service.

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

This X.Org update fixes the following security and non security issues :

  - Add and update security patches. (bnc#907268,     CVE-2014-8091, CVE-2014-8092, CVE-2014-8093,     CVE-2014-8094, CVE-2014-8095, CVE-2014-8096,     CVE-2014-8097, CVE-2014-8098, CVE-2014-8099,     CVE-2014-8100, CVE-2014-8101, CVE-2014-8102,     CVE-2014-8103)     http://lists.x.org/archives/xorg-announce/2014-December/     002501.html

  - Fixes rendering of some icewm and xfwm themes.
    (bnc#908258, bnc#856931)

The XOrg X11 server was updated to fix 12 security issues :

  - Denial of service due to unchecked malloc in client     authentication. (CVE-2014-8091)

  - Integer overflows calculating memory needs for requests.
    (CVE-2014-8092)

  - Integer overflows calculating memory needs for requests     in GLX extension. (CVE-2014-8093)

  - Integer overflows calculating memory needs for requests     in DRI2 extension. (CVE-2014-8094)

  - Out of bounds access due to not validating length or     offset values in requests in XInput extension.
    (CVE-2014-8095)

  - Out of bounds access due to not validating length or     offset values in requests in XC-MISC extension.
    (CVE-2014-8096)

  - Out of bounds access due to not validating length or     offset values in requests in DBE extension.
    (CVE-2014-8097)

  - Out of bounds access due to not validating length or     offset values in requests in GLX extension.
    (CVE-2014-8098)

  - Out of bounds access due to not validating length or     offset values in requests in XVideo extension.
    (CVE-2014-8099)

  - Out of bounds access due to not validating length or     offset values in requests in Render extension.
    (CVE-2014-8100)

  - Out of bounds access due to not validating length or     offset values in requests in RandR extension.
    (CVE-2014-8101)

  - Out of bounds access due to not validating length or     offset values in requests in XFixes extension     (CVE-2014-8102). Additionally, these non-security issues     were fixed :

  - Fix crash in RENDER protocol, PanoramiX wrappers.
    (bnc#864911)

  - Some formats used for pictures did not work with the     chosen framebuffer format. (bnc#886213)

Updated x11-server packages fix security vulnerabilities :

Ilja van Sprundel of IOActive discovered several security issues in the X.org X server, which may lead to privilege escalation or denial of service (CVE-2014-8091, CVE-2014-8092, CVE-2014-8093, CVE-2014-8094, CVE-2014-8095, CVE-2014-8096, CVE-2014-8097, CVE-2014-8098, CVE-2014-8099, CVE-2014-8100, CVE-2014-8101, CVE-2014-8102).

Olivier Fourdan from Red Hat has discovered a protocol handling issue in the way the X server code base handles the XkbSetGeometry request, where the server trusts the client to send valid string lengths. A malicious client with string lengths exceeding the request length can cause the server to copy adjacent memory data into the XKB structs.
This data is then available to the client via the XkbGetGeometry request. This can lead to information disclosure issues, as well as possibly a denial of service if a similar request can cause the server to crash (CVE-2015-0255).

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2436-1 advisory.

    Ilja van Sprundel discovered a multitude of security issues in the X.Org X server. An attacker able to     connect to an X server, either locally or remotely, could use these issues to cause the X server to crash     or execute arbitrary code resulting in possible privilege escalation.

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.

Updated xorg-x11-server packages that fix multiple security issues are now available for Red Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

X.Org is an open source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.

Multiple integer overflow flaws and out-of-bounds write flaws were found in the way the X.Org server calculated memory requirements for certain X11 core protocol and GLX extension requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server or, potentially, execute arbitrary code with root privileges. (CVE-2014-8092, CVE-2014-8093, CVE-2014-8098)

It was found that the X.Org server did not properly handle SUN-DES-1 (Secure RPC) authentication credentials. A malicious, unauthenticated client could use this flaw to crash the X.Org server by submitting a specially crafted authentication request. (CVE-2014-8091)

Multiple out-of-bounds access flaws were found in the way the X.Org server calculated memory requirements for certain requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server, or leak memory contents to the client.
(CVE-2014-8097)

An integer overflow flaw was found in the way the X.Org server calculated memory requirements for certain DRI2 extension requests. A malicious, authenticated client could use this flaw to crash the X.Org server. (CVE-2014-8094)

Multiple out-of-bounds access flaws were found in the way the X.Org server calculated memory requirements for certain requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server. (CVE-2014-8095, CVE-2014-8096, CVE-2014-8099, CVE-2014-8100, CVE-2014-8101, CVE-2014-8102, CVE-2014-8103)

All xorg-x11-server users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:1983 advisory.

    X.Org is an open source implementation of the X Window System. It provides     the basic low-level functionality that full-fledged graphical user     interfaces are designed upon.

    Multiple integer overflow flaws and out-of-bounds write flaws were found in     the way the X.Org server calculated memory requirements for certain X11     core protocol and GLX extension requests. A malicious, authenticated client     could use either of these flaws to crash the X.Org server or, potentially,     execute arbitrary code with root privileges. (CVE-2014-8092, CVE-2014-8093,     CVE-2014-8098)

    It was found that the X.Org server did not properly handle SUN-DES-1     (Secure RPC) authentication credentials. A malicious, unauthenticated     client could use this flaw to crash the X.Org server by submitting a     specially crafted authentication request. (CVE-2014-8091)

    Multiple out-of-bounds access flaws were found in the way the X.Org server     calculated memory requirements for certain requests. A malicious,     authenticated client could use either of these flaws to crash the X.Org     server, or leak memory contents to the client. (CVE-2014-8097)

    An integer overflow flaw was found in the way the X.Org server calculated     memory requirements for certain DRI2 extension requests. A malicious,     authenticated client could use this flaw to crash the X.Org server.
    (CVE-2014-8094)

    Multiple out-of-bounds access flaws were found in the way the X.Org server     calculated memory requirements for certain requests. A malicious,     authenticated client could use either of these flaws to crash the X.Org     server. (CVE-2014-8095, CVE-2014-8096, CVE-2014-8099, CVE-2014-8100,     CVE-2014-8101, CVE-2014-8102, CVE-2014-8103)

    All xorg-x11-server users are advised to upgrade to these updated packages,     which contain backported patches to correct these issues.

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

Andreas Cord-Landwehr reported an issue where the X.Org Xserver would often crash with an arithmetic exception when maximizing application windows.

This issue (CVE-2015-3418) is a regression which got introduced by fixing CVE-2014-8092. The above referenced version of xorg-server in Debian squeeze-lts fixes this regression in the following way :

The length checking code validates PutImage height and byte width by making sure that byte-width >= INT32_MAX / height. If height is zero, this generates a divide by zero exception. Allow zero height requests explicitly, bypassing the INT32_MAX check (in dix/dispatch.c).

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.

ID	Name	Product	Family	Published	Updated	Severity
80557	Amazon Linux AMI : xorg-x11-server (ALAS-2015-470)	Nessus	Amazon Linux Local Security Checks	1/16/2015	4/18/2018	medium
79882	Debian DSA-3095-1 : xorg-server - security update	Nessus	Debian Local Security Checks	12/15/2014	1/11/2021	medium
80206	Slackware 14.1 / current : xorg-server (SSA:2014-356-03)	Nessus	Slackware Local Security Checks	12/23/2014	1/14/2021	medium
80275	openSUSE Security Update : xorg-x11-server (openSUSE-SU-2014:1719-1)	Nessus	SuSE Local Security Checks	12/29/2014	1/19/2021	medium
80547	SuSE 11.3 Security Update : xorg-x11-server (SAT Patch Number 10108)	Nessus	SuSE Local Security Checks	1/15/2015	1/19/2021	medium
82372	Mandriva Linux Security Advisory : x11-server (MDVSA-2015:119)	Nessus	Mandriva Local Security Checks	3/30/2015	1/14/2021	medium
79852	Ubuntu 14.04 LTS : X.Org X server vulnerabilities (USN-2436-1)	Nessus	Ubuntu Local Security Checks	12/10/2014	8/27/2024	critical
79879	CentOS 6 / 7 : xorg-x11-server (CESA-2014:1983)	Nessus	CentOS Local Security Checks	12/15/2014	1/4/2021	medium
80011	RHEL 6 / 7 : xorg-x11-server (RHSA-2014:1983)	Nessus	Red Hat Local Security Checks	12/15/2014	3/21/2025	high
82103	Debian DLA-120-2 : xorg-server regression update	Nessus	Debian Local Security Checks	3/26/2015	1/11/2021	high

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