Qt 是一个软件工具包，可简化编写和维护 X Window System 的 GUI（图形用户界面）应用程序的任务。HarfBuzz 是一款 OpenType 文本字型引擎。

Qt 的 harfbuzz 模块中发现缓冲区溢出缺陷。如果用户使用链接 Qt 的应用程序来加载特别构建的字体文件，则可能导致应用程序崩溃或可能以运行该应用程序的用户的权限来执行任意代码。(CVE-2011-3922)

在 Qt 处理带有 IP 地址通配符的 X.509 证书的方式中发现一个缺陷。如果攻击者可获取通用名中带 IP 通配符的证书，则可能利用此缺陷冒充在使用 Qt 的客户端应用程序的 SSL 服务器。此更新还通过禁止通配符匹配多个主机名组件，引入了对主机名通配符证书更严格的处理。(CVE-2010-5076)

此更新还修复以下缺陷：

- Phonon API 允许过早释放媒体对象。结果，GStreamer 可能由于无法访问释放的媒体对象而意外终止。此更新修改了底层 Phonon API 代码，所以不再出现该问题。

- 以前，Qt 可输出“无法识别的 OpenGL 版本”错误并恢复为 OpenGL-version-1 兼容模式。这是因为如果系统使用的 OpenGL 版本在使用的 Qt 版本之后发布，则 Qt 无法识别系统上安装的 OpenGL 版本。此更新增加了用于为 Qt 识别 OpenGL 版本的代码，并且如果 OpenGL 版本未知，Qt 将假设提供的是 OpenGL 的最新已知版本。

- 以前，Qt 中包含内编译的受信任 CA（证书颁发机构）证书列表，如果 Qt 无法打开系统的 ca-bundle.crt 文件，可能是因为使用了该列表。通过此更新，Qt 中不再包含内编译的 CA 证书，仅使用系统捆绑包。

Qt 用户应升级这些更新后的程序包，其中包含用于修正这些问题的向后移植的修补程序。必须重新启动所有链接 Qt 库且正在运行的应用程序才能使此更新生效。

A stack-based buffer overflow in the glyph handling of libqt4's harfbuzz has been fixed. CVE-2011-3922 has been assigned to this issue.

Updated qt packages that fix two security issues and three bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team 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.

Qt is a software toolkit that simplifies the task of writing and maintaining GUI (Graphical User Interface) applications for the X Window System. HarfBuzz is an OpenType text shaping engine.

A buffer overflow flaw was found in the harfbuzz module in Qt. If a user loaded a specially crafted font file with an application linked against Qt, it could cause the application to crash or, possibly, execute arbitrary code with the privileges of the user running the application. (CVE-2011-3922)

A flaw was found in the way Qt handled X.509 certificates with IP address wildcards. An attacker able to obtain a certificate with a Common Name containing an IP wildcard could possibly use this flaw to impersonate an SSL server to client applications that are using Qt.
This update also introduces more strict handling for hostname wildcard certificates by disallowing the wildcard character to match more than one hostname component. (CVE-2010-5076)

This update also fixes the following bugs :

* The Phonon API allowed premature freeing of the media object.
Consequently, GStreamer could terminate unexpectedly as it failed to access the released media object. This update modifies the underlying Phonon API code and the problem no longer occurs. (BZ#694684)

* Previously, Qt could output the 'Unrecognized OpenGL version' error and fall back to OpenGL-version-1 compatibility mode. This happened because Qt failed to recognize the version of OpenGL installed on the system if the system was using a version of OpenGL released later than the Qt version in use. This update adds the code for recognition of OpenGL versions to Qt and if the OpenGL version is unknown, Qt assumes that the last-known version of OpenGL is available. (BZ#757793)

* Previously Qt included a compiled-in list of trusted CA (Certificate Authority) certificates, that could have been used if Qt failed to open a system's ca-bundle.crt file. With this update, Qt no longer includes compiled-in CA certificates and only uses the system bundle.
(BZ#734444)

Users of Qt should upgrade to these updated packages, which contain backported patches to correct these issues. All running applications linked against Qt libraries must be restarted for this update to take effect.

Qt is a software toolkit that simplifies the task of writing and maintaining GUI (Graphical User Interface) applications for the X Window System. HarfBuzz is an OpenType text shaping engine.

A buffer overflow flaw was found in the harfbuzz module in Qt. If a user loaded a specially crafted font file with an application linked against Qt, it could cause the application to crash or, possibly, execute arbitrary code with the privileges of the user running the application. (CVE-2011-3922)

A flaw was found in the way Qt handled X.509 certificates with IP address wildcards. An attacker able to obtain a certificate with a Common Name containing an IP wildcard could possibly use this flaw to impersonate an SSL server to client applications that are using Qt.
This update also introduces more strict handling for hostname wildcard certificates by disallowing the wildcard character to match more than one hostname component. (CVE-2010-5076)

This update also fixes the following bugs :

  - The Phonon API allowed premature freeing of the media     object. Consequently, GStreamer could terminate     unexpectedly as it failed to access the released media     object. This update modifies the underlying Phonon API     code and the problem no longer occurs.

  - Previously, Qt could output the 'Unrecognized OpenGL     version' error and fall back to OpenGL-version-1     compatibility mode. This happened because Qt failed to     recognize the version of OpenGL installed on the system     if the system was using a version of OpenGL released     later than the Qt version in use. This update adds the     code for recognition of OpenGL versions to Qt and if the     OpenGL version is unknown, Qt assumes that the     last-known version of OpenGL is available.

  - Previously Qt included a compiled-in list of trusted CA     (Certificate Authority) certificates, that could have     been used if Qt failed to open a system's ca-bundle.crt     file. With this update, Qt no longer includes     compiled-in CA certificates and only uses the system     bundle.

Users of Qt should upgrade to these updated packages, which contain backported patches to correct these issues. All running applications linked against Qt libraries must be restarted for this update to take effect.

From Red Hat Security Advisory 2012:0880 :

Updated qt packages that fix two security issues and three bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team 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.

Qt is a software toolkit that simplifies the task of writing and maintaining GUI (Graphical User Interface) applications for the X Window System. HarfBuzz is an OpenType text shaping engine.

A buffer overflow flaw was found in the harfbuzz module in Qt. If a user loaded a specially crafted font file with an application linked against Qt, it could cause the application to crash or, possibly, execute arbitrary code with the privileges of the user running the application. (CVE-2011-3922)

A flaw was found in the way Qt handled X.509 certificates with IP address wildcards. An attacker able to obtain a certificate with a Common Name containing an IP wildcard could possibly use this flaw to impersonate an SSL server to client applications that are using Qt.
This update also introduces more strict handling for hostname wildcard certificates by disallowing the wildcard character to match more than one hostname component. (CVE-2010-5076)

This update also fixes the following bugs :

* The Phonon API allowed premature freeing of the media object.
Consequently, GStreamer could terminate unexpectedly as it failed to access the released media object. This update modifies the underlying Phonon API code and the problem no longer occurs. (BZ#694684)

* Previously, Qt could output the 'Unrecognized OpenGL version' error and fall back to OpenGL-version-1 compatibility mode. This happened because Qt failed to recognize the version of OpenGL installed on the system if the system was using a version of OpenGL released later than the Qt version in use. This update adds the code for recognition of OpenGL versions to Qt and if the OpenGL version is unknown, Qt assumes that the last-known version of OpenGL is available. (BZ#757793)

* Previously Qt included a compiled-in list of trusted CA (Certificate Authority) certificates, that could have been used if Qt failed to open a system's ca-bundle.crt file. With this update, Qt no longer includes compiled-in CA certificates and only uses the system bundle.
(BZ#734444)

Users of Qt should upgrade to these updated packages, which contain backported patches to correct these issues. All running applications linked against Qt libraries must be restarted for this update to take effect.

fix stack based overflow in harbuzz parser

Versions of Google Chrome earlier than 16.0.912.75 are potentially affected by multiple vulnerabilities :

  - A heap-based buffer overflow exists in libxml. (CVE-2011-3919)

  - A use-after-free error exists related to animation frames. (CVE-2011-3921)

  - A stack-based-buffer overflow exists related to glyph processing. (CVE-2011-3922)

ID	名稱	產品	系列	已發布	已更新	嚴重性
61347	Scientific Linux 安全更新：SL6.x i386/x86_64 中的 qt	Nessus	Scientific Linux Local Security Checks	2012/8/1	2021/1/14	high
57596	SuSE 11.1 Security Update : libqt4 (SAT Patch Number 5624)	Nessus	SuSE Local Security Checks	2012/1/19	2021/1/19	high
59928	CentOS 6 : qt (CESA-2012:0880)	Nessus	CentOS Local Security Checks	2012/7/11	2021/1/4	high
61347	Scientific Linux Security Update : qt on SL6.x i386/x86_64 (20120620)	Nessus	Scientific Linux Local Security Checks	2012/8/1	2021/1/14	high
68557	Oracle Linux 6 : qt (ELSA-2012-0880)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2021/1/14	high
74789	openSUSE Security Update : libqt4 (openSUSE-2012-72)	Nessus	SuSE Local Security Checks	2014/6/13	2021/1/19	high
800946	Google Chrome < 16.0.912.75 Multiple Vulnerabilities	Log Correlation Engine	Web Clients	2012/1/11		high

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