xorg-x11-libs 的此更新修复了多个整数和缓冲区溢出问题。（bnc#815451、bnc#821663）

用于修复 CVE-2013-1991 的更新

请注意，Tenable Network Security 已直接从 Fedora 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

libXxf86dga 的此更新修复了多个缓冲区和整数溢出问题。

- U_0001-integer-overflow-in-XDGAQueryModes-CVE-2013-1991- 1-2.patch、U_0002-integer-overflow-underflow-in-XDGASetMode-CVE-201 3-1.patch

- XDGAQueryModes() 中的整数溢出；XDGASetMode() 中的整数上溢和下溢 [CVE-2013-1991]（bnc#821663、bnc#815451）

- U_0001-buffer-overflow-in-XDGAQueryModes-CVE-2013-2000-1-2.patch、U_0002-buffer-overflow-in-XDGASetMode-CVE-2013-2000-2-2。
 patch

- XDGAQueryModes()、XDGASetMode() 中的缓冲区溢出 [CVE-2013-2000]（bnc#821663、bnc#815451）

更新后的 X11 客户端库程序包修复了多个安全问题和若干缺陷，并添加了多种增强，现在可用于 Red Hat Enterprise Linux 6。

Red Hat 产品安全团队将此更新评级为具有中等安全影响。可从“参考”部分中的 CVE 链接获取针对每个漏洞的通用漏洞评分系统 (CVSS) 基本分数，其给出了详细的严重性等级。

X11 (Xorg) 库提供在所有 X Window 应用程序中使用的库例程。

在多个 X11 客户端库处理某些协议数据的方式中发现多种整数溢出缺陷，会导致基于堆的缓冲区溢出。能够通过恶意 X11 客户端向 X11 服务器提交无效协议数据的攻击者可利用其中任一缺陷升级其在系统中的权限。
（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）

在多个 X11 客户端库处理从 X11 服务器返回的数据的方式中发现多种数组索引错误，会导致基于堆的缓冲区越界写入缺陷。恶意 X11 服务器可能利用此缺陷以运行 X11 客户端的用户的权限执行任意代码。（CVE-2013-1997、CVE-2013-1998、CVE-2013-1999、CVE-2013-2000、CVE-2013-2001、CVE-2013-2002、CVE-2013-2066）

在 X.Org X11 的 libXi 运行时库的 XListInputDevices() 函数处理签名数字的方式中发现一个缓冲区溢出缺陷。
恶意 X11 服务器可能利用此缺陷以运行 X11 客户端的用户的权限执行任意代码。
(CVE-2013-1995)

在 X.Org X11 libXt 运行时库使用未初始化的指针的方式中发现一个缺陷。恶意 X11 服务器可能利用此缺陷以运行 X11 客户端的用户的权限执行任意代码。(CVE-2013-2005)

在 libX11（核心 X11 协议客户端库）处理某些用户指定的文件的方式中发现两个基于堆栈的缓冲区溢出缺陷。恶意 X11 服务器可能利用此缺陷，通过特别构建的文件导致 X11 客户端崩溃。(CVE-2013-2004)

xkeyboard-config 程序包已升级到上游版本 2.11，其提供了对之前版本的多项缺陷补丁和增强。(BZ#1077471)

此更新还修复以下缺陷：

* 以前，更新 mesa-libGL 程序包时不会更新 libX11 程序包，尽管它被列为与 mesa-libGL 存在依存关系。
此缺陷已修复，现在更新 mesa-libGL 时会按预期更新所有相关的程序包。(BZ#1054614)

* 此前，关闭客户应用程序可能偶尔会导致 X Server 意外终止。在此更新后，X Server 不会再在用户关闭客户应用程序时挂起。
(BZ#971626)

建议所有 X11 客户端库用户升级这些更新后的程序包，其中修正了这些问题并添加这些增强。

IOActive 的 Ilja van Sprundel 发现 X.org 图形堆栈及其相关库的多个组件中存在多个安全问题：各种整数溢出、整数转换中的符号处理错误、缓冲区溢出、内存损坏和输入审查缺失，可能导致权限升级或拒绝服务。

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 of xorg-x11-libs fixes several integer and buffer overflow issues. (bnc#815451, bnc#821663)

update to fix CVE-2013-1991

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.

This update of libXxf86dga fixes several buffer and integer overflow issues.

  -     U_0001-integer-overflow-in-XDGAQueryModes-CVE-2013-1991-     1-2.patch,     U_0002-integer-overflow-underflow-in-XDGASetMode-CVE-201     3-1.patch

  - integer overflow in XDGAQueryModes(); integer overflow &     underflow in XDGASetMode() [CVE-2013-1991] (bnc#821663,     bnc#815451)

  -     U_0001-buffer-overflow-in-XDGAQueryModes-CVE-2013-2000-1
    -2.patch,     U_0002-buffer-overflow-in-XDGASetMode-CVE-2013-2000-2-2.
    patch

  - buffer overflow in XDGAQueryModes(), XDGASetMode()     [CVE-2013-2000] (bnc#821663, bnc#815451)

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.

  - libXxf86dga: Array Index error leading to heap-based OOB write (CVE-2013-2000)

  - Multiple integer overflows in X.org libXxf86dga 1.1.3 and earlier allow X servers to trigger allocation of     insufficient memory and a buffer overflow via vectors related to the (1) XDGAQueryModes and (2)     XDGASetMode functions. (CVE-2013-1991)

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

Updated X11 client libraries packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate 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.

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.

ID	Name	Product	Family	Published	Updated	Severity
67106	SuSE 11.2 安全更新：xorg-x11-libs（SAT 修补程序编号 7846）	Nessus	SuSE Local Security Checks	6/29/2013	1/19/2021	medium
67356	Fedora 18：libXxf86dga-1.1.3-5.20130524gita8dc6be32.fc18 (2013-9177)	Nessus	Fedora Local Security Checks	7/12/2013	1/11/2021	medium
75045	openSUSE 安全更新：libXxf86dga (openSUSE-SU-2013:1030-1)	Nessus	SuSE Local Security Checks	6/13/2014	1/19/2021	medium
78411	RHEL 6：X11 客户端库 (RHSA-2014:1436)	Nessus	Red Hat Local Security Checks	10/14/2014	1/14/2021	medium
66574	Debian DSA-2690-1：libxxf86dga - 多个漏洞	Nessus	Debian Local Security Checks	5/24/2013	1/11/2021	medium
66574	Debian DSA-2690-1 : libxxf86dga - several vulnerabilities	Nessus	Debian Local Security Checks	5/24/2013	1/11/2021	medium
67106	SuSE 11.2 Security Update : xorg-x11-libs (SAT Patch Number 7846)	Nessus	SuSE Local Security Checks	6/29/2013	1/19/2021	medium
67356	Fedora 18 : libXxf86dga-1.1.3-5.20130524gita8dc6be32.fc18 (2013-9177)	Nessus	Fedora Local Security Checks	7/12/2013	1/11/2021	medium
75045	openSUSE Security Update : libXxf86dga (openSUSE-SU-2013:1030-1)	Nessus	SuSE Local Security Checks	6/13/2014	1/19/2021	medium
199655	RHEL 5 : libxxf86dga (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	high
78411	RHEL 6 : X11 client libraries (RHSA-2014:1436)	Nessus	Red Hat Local Security Checks	10/14/2014	1/14/2021	medium

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