freedesktop.org reports :

Ilja van Sprundel, a security researcher with IOActive, has discovered a large number of issues in the way various X client libraries handle the responses they receive from servers, and has worked with X.Org's security team to analyze, confirm, and fix these issues.

Most of these issues stem from the client libraries trusting the server to send correct protocol data, and not verifying that the values will not overflow or cause other damage. Most of the time X clients & servers are run by the same user, with the server more privileged from the clients, so this is not a problem, but there are scenarios in which a privileged client can be connected to an unprivileged server, for instance, connecting a setuid X client (such as a screen lock program) to a virtual X server (such as Xvfb or Xephyr) which the user has modified to return invalid data, potentially allowing the user to escalate their privileges.

The vulnerabilities include :

Integer overflows calculating memory needs for replies.

Sign extension issues calculating memory needs for replies.

Buffer overflows due to not validating length or offset values in replies.

Integer overflows parsing user-specified files.

Unbounded recursion parsing user-specified files.

Memory corruption due to unchecked return values.

Fix integer overflow (CVE-2013-2064)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora 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-201405-07 (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 context-dependent attacker could execute arbitrary code with the       privileges of the process, cause a Denial of Service condition, or obtain       sensitive information.
  Workaround :

    There is no known workaround at this time.

Ilja van Sprundel discovered multiple security issues in various X.org libraries and components. An attacker could use these issues to cause applications to crash, resulting in a denial of service, or possibly execute arbitrary code.

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

Integer overflow in X.org libxcb 1.9 and earlier allows X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the read_packet function.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:1436 advisory.

    The X11 (Xorg) libraries provide library routines that are used within all     X Window applications.

    Multiple integer overflow flaws, leading to heap-based buffer overflows,     were found in the way various X11 client libraries handled certain protocol     data. An attacker able to submit invalid protocol data to an X11 server via     a malicious X11 client could use either of these flaws to potentially     escalate their privileges on the system. (CVE-2013-1981, CVE-2013-1982,     CVE-2013-1983, CVE-2013-1984, CVE-2013-1985, CVE-2013-1986, CVE-2013-1987,     CVE-2013-1988, CVE-2013-1989, CVE-2013-1990, CVE-2013-1991, CVE-2013-2003,     CVE-2013-2062, CVE-2013-2064)

    Multiple array index errors, leading to heap-based buffer out-of-bounds     write flaws, were found in the way various X11 client libraries handled     data returned from an X11 server. A malicious X11 server could possibly use     this flaw to execute arbitrary code with the privileges of the user running     an X11 client. (CVE-2013-1997, CVE-2013-1998, CVE-2013-1999, CVE-2013-2000,     CVE-2013-2001, CVE-2013-2002, CVE-2013-2066)

    A buffer overflow flaw was found in the way the XListInputDevices()     function of X.Org X11's libXi runtime library handled signed numbers.
    A malicious X11 server could possibly use this flaw to execute arbitrary     code with the privileges of the user running an X11 client. (CVE-2013-1995)

    A flaw was found in the way the X.Org X11 libXt runtime library used     uninitialized pointers. A malicious X11 server could possibly use this flaw     to execute arbitrary code with the privileges of the user running an X11     client. (CVE-2013-2005)

    Two stack-based buffer overflow flaws were found in the way libX11, the     Core X11 protocol client library, processed certain user-specified files.
    A malicious X11 server could possibly use this flaw to crash an X11 client     via a specially crafted file. (CVE-2013-2004)

    The xkeyboard-config package has been upgraded to upstream version 2.11,     which provides a number of bug fixes and enhancements over the previous     version. (BZ#1077471)

    This update also fixes the following bugs:

    * Previously, updating the mesa-libGL package did not update the libX11     package, although it was listed as a dependency of mesa-libGL. This bug has     been fixed and updating mesa-libGL now updates all dependent packages as     expected. (BZ#1054614)

    * Previously, closing a customer application could occasionally cause the X     Server to terminate unexpectedly. After this update, the X Server no longer     hangs when a user closes a customer application. (BZ#971626)

    All X11 client libraries users are advised to upgrade to these updated     packages, which correct these issues and add these enhancements.

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.

Multiple integer overflow flaws, leading to heap-based buffer overflows, were found in the way various X11 client libraries handled certain protocol data. An attacker able to submit invalid protocol data to an X11 server via a malicious X11 client could use either of these flaws to potentially escalate their privileges on the system.
(CVE-2013-1981, CVE-2013-1982, CVE-2013-1983, CVE-2013-1984, CVE-2013-1985, CVE-2013-1986, CVE-2013-1987, CVE-2013-1988, CVE-2013-1989, CVE-2013-1990, CVE-2013-1991, CVE-2013-2003, CVE-2013-2062, CVE-2013-2064)

Multiple array index errors, leading to heap-based buffer out-of-bounds write flaws, were found in the way various X11 client libraries handled data returned from an X11 server. A malicious X11 server could possibly use this flaw to execute arbitrary code with the privileges of the user running an X11 client. (CVE-2013-1997, CVE-2013-1998, CVE-2013-1999, CVE-2013-2000, CVE-2013-2001, CVE-2013-2002, CVE-2013-2066)

A buffer overflow flaw was found in the way the XListInputDevices() function of X.Org X11's libXi runtime library handled signed numbers.
A malicious X11 server could possibly use this flaw to execute arbitrary code with the privileges of the user running an X11 client.
(CVE-2013-1995)

A flaw was found in the way the X.Org X11 libXt runtime library used uninitialized pointers. A malicious X11 server could possibly use this flaw to execute arbitrary code with the privileges of the user running an X11 client. (CVE-2013-2005)

Two stack-based buffer overflow flaws were found in the way libX11, the Core X11 protocol client library, processed certain user-specified files. A malicious X11 server could possibly use this flaw to crash an X11 client via a specially crafted file. (CVE-2013-2004)

The xkeyboard-config package has been upgraded to upstream version 2.11, which provides a number of bug fixes and enhancements over the previous version.

This update also fixes the following bugs :

  - Previously, updating the mesa-libGL package did not     update the libX11 package, although it was listed as a     dependency of mesa-libGL. This bug has been fixed and     updating mesa-libGL now updates all dependent packages     as expected.

  - Previously, closing a customer application could     occasionally cause the X Server to terminate     unexpectedly. After this update, the X Server no longer     hangs when a user closes a customer application.

This update of libxcb fixes a integer overflow issue :

  -     U_0001-integer-overflow-in-read_packet-CVE-2013-2064.pat     ch 

  - fixes integer overflow in read_packet() [CVE-2013-2064]     (bnc#821584, bnc#815451)

Ilja van Sprundel of IOActive discovered several security issues in multiple components of the X.org graphics stack and the related libraries: Various integer overflows, sign handling errors in integer conversions, buffer overflows, memory corruption and missing input sanitising may lead to privilege escalation or denial of service.

This update for xorg-x11-libxcb addresses the following security issues :

  - Fix a deadlock with multi-threaded applications running     on real time kernels. (bnc#818829)

  - Fix an integer overflow in read_packet(). (bnc#821584,     CVE-2013-2064)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
66798	FreeBSD : xorg -- protocol handling issues in X Window System client libraries (2eebebff-cd3b-11e2-8f09-001b38c3836c)	Nessus	FreeBSD Local Security Checks	2013/6/5	2021/1/6	medium
67355	Fedora 18 : libxcb-1.9-3.fc18 (2013-9156)	Nessus	Fedora Local Security Checks	2013/7/12	2021/1/11	medium
74028	GLSA-201405-07 : X.Org X Server: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2014/5/16	2021/1/6	medium
66819	Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : libxcb vulnerability (USN-1855-1)	Nessus	Ubuntu Local Security Checks	2013/6/6	2019/9/19	medium
78348	Amazon Linux AMI : libxcb (ALAS-2014-405)	Nessus	Amazon Linux Local Security Checks	2014/10/12	2018/4/18	medium
78411	RHEL 6 : X11 client libraries (RHSA-2014:1436)	Nessus	Red Hat Local Security Checks	2014/10/14	2025/3/21	critical
78841	Scientific Linux Security Update : X11 client libraries on SL6.x i386/x86_64 (20141014)	Nessus	Scientific Linux Local Security Checks	2014/11/4	2021/1/14	medium
75027	openSUSE Security Update : libxcb (openSUSE-SU-2013:1007-1)	Nessus	SuSE Local Security Checks	2014/6/13	2021/1/19	medium
66570	Debian DSA-2686-1 : libxcb - several vulnerabilities	Nessus	Debian Local Security Checks	2013/5/24	2021/1/11	medium
67114	SuSE 11.2 Security Update : xorg-x11-libxcb (SAT Patch Number 7760)	Nessus	SuSE Local Security Checks	2013/6/29	2021/1/19	medium

检测

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