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).

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)

Alan Coopersmith reports :

Ilja van Sprundel, a security researcher with IOActive, has discovered a large number of issues in the way the X server code base handles requests from X clients, and has worked with X.Org's security team to analyze, confirm, and fix these issues.

The vulnerabilities could be exploited to cause the X server to access uninitialized memory or overwrite arbitrary memory in the X server process. This can cause a denial of service (e.g., an X server segmentation fault), or could be exploited to achieve arbitrary code execution.

The GLX extension to the X Window System allows an X client to send X protocol to the X server, to request that the X server perform OpenGL rendering on behalf of the X client. This is known as 'GLX indirect rendering', as opposed to 'GLX direct rendering' where the X client submits OpenGL rendering commands directly to the GPU, bypassing the X server and avoiding the X server code for GLX protocol handling.

Most GLX indirect rendering implementations share some common ancestry, dating back to 'Sample Implementation' code from Silicon Graphics, Inc (SGI), which SGI originally commercially licensed to other Unix workstation and graphics vendors, and later released as open source, so those vulnerabilities may affect other licensees of SGI's code base beyond those running code from the X.Org Foundation or the XFree86 Project.

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

    [1.15.0-7.0.1.el7_0.3]
    - Invalid BUG_RETURN_VAL fix, upstream patch (orabug 18896390)

    [1.15.0-7.3]
    - CVE fixes for: CVE-2014-8099, CVE-2014-8098, CVE-2014-8097, CVE-2014-8096,       CVE-2014-8095, CVE-2014-8094, CVE-2014-8093, CVE-2014-8092, CVE-2014-8091,       CVE-2014-8101, CVE-2014-8100, CVE-2014-8103, CVE-2014-8102

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.

This X.Org update fixes the following 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: X11 core protocol requests CVE-2014-8093:
    GLX extension CVE-2014-8094: DRI2 extension

  - out of bounds access due to not validating length or     offset values in requests: CVE-2014-8095: XInput     extension CVE-2014-8096: XC-MISC extension     CVE-2014-8097: DBE extension CVE-2014-8098: GLX     extension CVE-2014-8099: XVideo extension CVE-2014-8100:
    Render extension CVE-2014-8101: RandR extension     CVE-2014-8102: XFixes extension CVE-2014-8103: DRI3 and     Present extensions

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 host is affected by the vulnerability described in GLSA-201504-06 (X.Org X Server: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in X.Org X Server. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could possibly execute arbitrary code with the       privileges of the process or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
79882	Debian DSA-3095-1 : xorg-server - security update	Nessus	Debian Local Security Checks	2014/12/15	2021/1/11	medium
80206	Slackware 14.1 / current : xorg-server (SSA:2014-356-03)	Nessus	Slackware Local Security Checks	2014/12/23	2021/1/14	medium
80275	openSUSE Security Update : xorg-x11-server (openSUSE-SU-2014:1719-1)	Nessus	SuSE Local Security Checks	2014/12/29	2021/1/19	medium
80547	SuSE 11.3 Security Update : xorg-x11-server (SAT Patch Number 10108)	Nessus	SuSE Local Security Checks	2015/1/15	2021/1/19	medium
82372	Mandriva Linux Security Advisory : x11-server (MDVSA-2015:119)	Nessus	Mandriva Local Security Checks	2015/3/30	2021/1/14	medium
80557	Amazon Linux AMI : xorg-x11-server (ALAS-2015-470)	Nessus	Amazon Linux Local Security Checks	2015/1/16	2018/4/18	medium
79955	FreeBSD : xserver -- multiple issue with X client request handling (27b9b2f0-8081-11e4-b4ca-bcaec565249c)	Nessus	FreeBSD Local Security Checks	2014/12/15	2021/1/6	medium
80001	Oracle Linux 6 / 7 : xorg-x11-server (ELSA-2014-1983)	Nessus	Oracle Linux Local Security Checks	2014/12/15	2024/11/1	critical
83664	SUSE SLED12 / SLES12 Security Update : xorg-x11-server (SUSE-SU-2015:0047-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/6	medium
84071	GLSA-201504-06 : X.Org X Server: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2015/6/10	2021/1/11	medium

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