更新后的 gdk-pixbuf2 程序包修复了一个安全问题，现在可用于 Red Hat Enterprise Linux 6 和 7。

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。

gdk-pixbuf 是一个图像加载库，可通过可加载模块对其进行扩展，以支持新的图像格式。用于 GTK+ 或 clutter 等工具包。

发现 gdk-pixbuf（GNOME 的图像加载库）缩放特定的位图格式图像的方式中存在整数溢出，可导致基于堆的缓冲区溢出。攻击者可使用特别构建的 BMP 图像文件，在针对 gdk-pixbuf 库编译的应用程序处理该文件时造成该应用程序崩溃，或以运行该应用程序的用户的权限执行任意代码。(CVE-2015-4491)

Red Hat 在此感谢 Mozilla 项目报告此问题。上游感谢原始报告者 Gustavo Grieco。

建议所有 gdk-pixbuf2 用户升级这些更新后的程序包，其中包含用于修正此问题的向后移植的修补程序。

更新 gdk pixbuf 库以修复三个安全问题。

修复了这些安全问题：

- CVE-2015-7673：修复缩放 gif 时存在的更多溢出 (bsc#948791)

- CVE-2015-4491：在缩放时检查分配内存之前的溢出 (bsc#942801)

- CVE-2015-7673：修复缩放 TGA 文件时存在的溢出和 DoS (bsc#948790)。

- CVE-2015-7674：修复缩放 GIF 文件时存在的溢出 (bsc#948791)。

请注意，Tenable Network Security 已直接从 SUSE 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。

远程主机受到 GLSA-201512-05 中所述漏洞的影响（gdk-pixbuf：多种漏洞）

已在 gdk-pixbuf 中发现三个基于堆的缓冲区溢出漏洞。请检查下面引用的 CVE 标识符以了解详细信息。
 影响：

远程攻击者可诱骗用户在与 gdk-pixbuf 链接的应用程序中打开特别构建的图像文件，这可能导致以该进程的权限执行任意代码，或造成拒绝服务情况。
 变通方案：

目前无任何已知的变通方案。

The version of Mozilla Firefox is prior to 40.0 and is affected by multiple vulnerabilities : 

 - Multiple memory corruption issues exist that allow a remote attacker, via a specially crafted web page, to corrupt memory and potentially execute arbitrary code. (CVE-2015-4473) 
 - Multiple memory corruption issues exist that allow a remote attacker, via a specially crafted web page, to corrupt memory and potentially execute arbitrary code. (CVE-2015-4474) 
 - An out-of-bounds read error exists in the 'PlayFromAudioQueue()' function due to improper handling of mismatched sample formats. A remote attacker can exploit this, via a specially crafted MP3 file, to disclose memory contents or execute arbitrary code. (CVE-2015-4475) 
 - A use-after-free error exists in the Web Audio API during MediaStream playback. A remote attacker can exploit this to dereference already freed memory, resulting in the potential execution of arbitrary code. (CVE-2015-4477) 
 - A same-origin policy bypass vulnerability exists due to non-configurable properties being redefined in violation of the ECMAScript 6 standard during JSON parsing. A remote attacker can exploit this, by editing these properties to arbitrary values, to bypass the same-origin policy. (CVE-2015-4478) 
 - Multiple integer overflow conditions exist due to improper validation of user-supplied input when handling 'saio' chunks in MPEG4 video. A remote attacker can exploit this, via a specially crafted MPEG4 file, to execute arbitrary code. (CVE-2015-4479) 
 - An integer overflow condition exists in the bundled libstagefright component when handling H.264 media content. A remote attacker can exploit this, via a specially crafted MPEG4 file, to execute arbitrary code. (CVE-2015-4480) 
 - An arbitrary file overwrite vulnerability exists in the Mozilla Maintenance Service due to a race condition. An attacker can exploit this, via the use of a hard link, to overwrite arbitrary files with log output. (CVE-2015-4481) 
 - An out-of-bounds write error exists due to an array indexing flaw in the 'mar_consume_index()' function when handling index names in MAR files. An attacker can exploit this to execute arbitrary code. (CVE-2015-4482) 
 - A security bypass vulnerability exists due to a flaw in the 'ShouldLoad()' function that occurs during the handling of POST requests to URLs using the 'feed:' URI handler. An attacker can exploit this to bypass the mixed content blocker. (CVE-2015-4483) 
 - A denial of service vulnerability exists when handling JavaScript using shared memory without properly gating access to Atomics and SharedArrayBuffer views. An attacker can exploit this to crash the program, resulting in a denial of service condition. (CVE-2015-4484) 
 - A heap-based buffer overflow condition exists in the  'resize_context_buffers()' function due to improper validation of user-supplied input. A remote attacker can exploit this, via specially crafted WebM content, to cause a heap-based buffer overflow, resulting in the execution of arbitrary code. (CVE-2015-4485) 
 - A heap-based buffer overflow condition exists in the 'decrease_ref_count()' function due to improper validation of user-supplied input. A remote attacker can exploit this, via specially crafted WebM content, to cause a heap-based buffer overflow, resulting in the execution of arbitrary code. (CVE-2015-4486) 
 - A buffer overflow condition exists in the 'ReplacePrep()' function. A remote attacker can exploit this to cause a buffer overflow, resulting in the execution of arbitrary code. (CVE-2015-4487) 
 - A use-after-free error exists in the 'operator=()' function. An attacker can exploit this to dereference already freed memory, resulting in the execution of arbitrary code. (CVE-2015-4488) 
 - A memory corruption issue exists in the 'nsTArray_Impl()' function due to improper validation of user-supplied input during self-assignment. An attacker can exploit this to corrupt memory, resulting in the execution of arbitrary code. (CVE-2015-4489) 
 - A security bypass vulnerability exists due to a discrepancy in the implementation of Content Security Policy and the CSP specification. The specification states that 'blob:', 'data:', and 'filesystem:' URLs should be excluded in case of a wildcard when matching source expressions, but Mozilla's implementation allows these in the case of an asterisk wildcard. A remote attacker can exploit this to bypass restrictions. (CVE-2015-4490) 
 - A use-after-free error exists in the 'XMLHttpRequest::Open()' function due to improper handling of recursive calls. An attacker can exploit this to dereference already freed memory, resulting in the execution of arbitrary code. (CVE-2015-4492) 
 - An integer underflow condition exists in the bundled libstagefright library. An attacker can exploit this to crash the application, resulting in a denial of service condition. (CVE-2015-4493) 
 - A flaw in the same origin policy in which an attacker can inject script code into a non-privileged part of browser's built-in PDF reader, resulting in gaining access to sensitive local files. (CVE-2015-4495)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
86499	CentOS 6 / 7：gdk-pixbuf2 (CESA-2015:1694)	Nessus	CentOS Local Security Checks	2015/10/22	2021/1/4	medium
87215	SUSE SLED12 / SLES12 安全更新：gdk-pixbuf (SUSE-SU-2015:2195-1)	Nessus	SuSE Local Security Checks	2015/12/7	2021/1/6	medium
87546	GLSA-201512-05：gdk-pixbuf：多种漏洞	Nessus	Gentoo Local Security Checks	2015/12/22	2021/1/11	medium
8856	Mozilla Firefox < 40.0 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	2015/9/9	2019/3/6	critical

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