firefox 的更新现在可用于 Red Hat Enterprise Linux 5、Red Hat Enterprise Linux 6 和 Red Hat Enterprise Linux 7。

Red Hat 产品安全团队已将此更新评级为具有重要安全影响。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，其针对每个漏洞给出了详细的严重性等级。

Mozilla Firefox 是一款开源 Web 浏览器。

此更新将 Firefox 升级到 45.2.0 ESR 版。

安全补丁：

* 在处理畸形 Web 内容时发现多个缺陷。包含恶意内容的网页可导致 Firefox 崩溃，或者可能以运行 Firefox 的用户的权限执行任意代码。（CVE-2016-2818、CVE-2016-2819、CVE-2016-2821、CVE-2016-2822、CVE-2016-2828、CVE-2016-2831）

Red Hat 在此感谢 Mozilla 项目报告这些问题。上游感谢原始报告者 sushi Anton Larsson、firehack、Jordi Chancel、Christian Holler、Sylvestre Ledru、Tyson Smith、jomo、Jesse Ruderman、Julian Seward、Timothy Nikkel、Karl Tomlinson、Olli Pettay 和 Gary Kwong。

远程 Mac OS X 主机上安装的 Firefox ESR 版本为低于 45.2 的 45.x 版。因此，它受到多种漏洞的影响：

- 存在多种内存损坏问题，未经认证的远程攻击者可利用这些问题执行任意代码。(CVE-2016-2818)

- 存在一个溢出情况，其会于在外部上下文（例如在 <svg> 节点之下）中处理 HTML5 拆分时触发。未经认证的远程攻击者可利用此漏洞造成基于堆的缓冲区溢出，从而导致执行任意代码。
 (CVE-2016-2819)

- 存在一个释放后使用错误，其会于在“可编辑内容”模式中删除 DOM 表元素时触发。
 未经认证的远程攻击者可利用此问题取消引用已经释放的内存，从而导致执行任意代码。(CVE-2016-2821)

- 存在一个欺骗漏洞，这是因为不当处理 SELECT 元素所导致。未经认证的远程攻击者可利用此漏洞伪造地址栏的内容。(CVE-2016-2822)

- 存在一个释放后使用错误，其会在破坏于处理 WebGL 内容期间使用的纹理的回收池时触发。未经认证的远程攻击者可利用此问题取消引用已经释放的内存，从而导致执行任意代码。
 (CVE-2016-2828)

- 存在一个缺陷，其会在结合关闭窗口处理配对全屏与指针锁定请求时触发。未经认证的远程攻击者可利用此缺陷创建未经授权的指针锁定，进而导致拒绝服务情况。
 此外，攻击者可利用此问题发动欺骗和点击劫持攻击。(CVE-2016-2831)

Christian Holler、Gary Kwong、Jesse Ruderman、Tyson Smith、Timothy Nikkel、Sylvestre Ledru、Julian Seward、Olli Pettay、Karl Tomlinson、Christoph Diehl、Julian Hector、Jan de Mooij、Mats Palmgren 和 Tooru Fujisawa 在 Firefox 中发现多个内存安全问题。如果用户受到诱骗打开特制的网站，攻击者可能利用这些漏洞，通过应用程序崩溃造成拒绝服务或执行任意代码。（CVE-2016-2815、CVE-2016-2818）

在某些情况下解析 HTML5 拆分时，发现一个缓冲区溢出问题。如果用户受到诱骗打开特制的网站，攻击者可能利用此漏洞，通过应用程序崩溃造成拒绝服务或是执行任意代码。
(CVE-2016-2819)

在某些情况下使用可编辑内容模式时，发现一个释放后使用问题。如果用户受到诱骗打开特制的网站，攻击者可能利用此漏洞，通过应用程序崩溃造成拒绝服务或是执行任意代码。
(CVE-2016-2821)

Jordi Chancel 发现一种可在 <select> 元素中使用永久菜单并置于任意位置的方法。如果用户受到诱骗打开特别构建的网站，攻击者可能利用此问题伪造地址栏内容。
(CVE-2016-2822)

Armin Razmdjou 发现，创建无效的 data: URI 后，location.host 属性可设置为任意字符串。如果用户受到诱骗打开特别构建的的网站，攻击者可能利用此问题绕过某些同源保护。
(CVE-2016-2825)

在某些情况下处理 WebGL 内容时，发现一个释放后使用问题。如果用户受到诱骗打开特制的网站，攻击者可能利用此漏洞，通过应用程序崩溃造成拒绝服务或是执行任意代码。
(CVE-2016-2828)

Tim McCormack 发现，页面快速连续请求多个权限时，权限通知可显示错误的图标。攻击者可能利用此问题，诱骗用户同意访问错误的资源。
(CVE-2016-2829)

已发现在某些情况下，无须用户同意即可在全屏窗口中创建指针锁定，而且必须退出 Firefox 才能取消此指针锁定。如果用户受到诱骗打开特别构建的网站，攻击者可能利用此问题，造成拒绝服务或发动点击劫持攻击。(CVE-2016-2831)

John Schoenick 发现，CSS 伪类可泄漏关于已安装但已禁用的插件的信息。攻击者可能利用此问题来识别用户。(CVE-2016-2832)

Matt Wobensmith 发现，在策略指定的情况下，内容安全策略 (CSP) 未阻断跨域 Java 小程序的加载。攻击者可能利用此问题，绕过 CSP 保护并发动跨站脚本 (XSS) 攻击。
(CVE-2016-2833)

此外，在 NSS 中发现多个不明安全问题。(CVE-2016-2834)

请注意，Tenable Network Security 已直接从 Ubuntu 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，尽可能进行自动清理和排版。

已在 Icedove（Debian 版本的 Mozilla Thunderbird 邮件客户端）中发现多种安全问题：多种内存安全错误可能导致任意代码执行或拒绝服务。

Versions of Mozilla Firefox earlier than 45.2 are unpatched for the following vulnerabilities :

 - Multiple memory corruption issues exist that allow an unauthenticated, remote attacker to execute arbitrary code. (CVE-2016-2815, CVE-2016-2818)
 - An overflow condition exists that is triggered when handling HTML5 fragments in foreign contexts (e.g., under <svg> nodes).  An unauthenticated, remote attacker can exploit this to cause a heap-based buffer overflow, resulting in the execution of arbitrary code. (CVE-2016-2819)
 - A use-after-free error exists that is triggered when deleting DOM table elements in 'contenteditable' mode.  An unauthenticated, remote attacker can exploit this to dereference already freed memory, resulting in the execution of arbitrary code. (CVE-2016-2821)
 - A spoofing vulnerability exists due to improper handling of SELECT elements.  An unauthenticated, remote attacker can exploit this to spoof the contents of the address bar. (CVE-2016-2822)
 - An out-of-bounds write flaw in 'TSymbolTableLevel' is triggered when size values for array writes are not properly checked during WebGL shader operations. This may allow a context-dependent attacker to potentially execute arbitrary code. (CVE-2016-2824)
 - A flaw exists in the Windows updater utility's 'toolkit/mozapps/update/updater/updater.cpp' extraction of files from MAR archives.  These files are not properly locked for writing, which may allow a local attacker to replace these files and potentially leverage them to gain elevated privileges. (CVE-2016-2826)
 - A use-after-free error exists that is triggered when destroying the recycle pool of a texture used during the processing of WebGL content.  An unauthenticated, remote attacker can exploit this to dereference already freed memory, resulting in the execution of arbitrary code. (CVE-2016-2828)
 - A flaw exists that is triggered when handling paired fullscreen and pointerlock requests in combination with closing windows.  An unauthenticated, remote attacker can exploit this to create an unauthorized pointerlock, resulting in a denial of service condition.  Additionally, an attacker can exploit this to conduct spoofing and clickjacking attacks. (CVE-2016-2831)

Versions of Mozilla Firefox earlier than 47.0 are unpatched for the following vulnerabilities :

 - Multiple memory corruption issues exist that allow an unauthenticated, remote attacker to execute arbitrary code. (CVE-2016-2815, CVE-2016-2818)
 - An overflow condition exists that is triggered when handling HTML5 fragments in foreign contexts (e.g., under <svg> nodes).  An unauthenticated, remote attacker can exploit this to cause a heap-based buffer overflow, resulting in the execution of arbitrary code. (CVE-2016-2819)
 - A use-after-free error exists that is triggered when deleting DOM table elements in 'contenteditable' mode.  An unauthenticated, remote attacker can exploit this to dereference already freed memory, resulting in the execution of arbitrary code. (CVE-2016-2821)
 - A spoofing vulnerability exists due to improper handling of SELECT elements.  An unauthenticated, remote attacker can exploit this to spoof the contents of the address bar. (CVE-2016-2822)
 - A same-origin bypass vulnerability exists that is triggered when handling 'location.host' property values set after the creation of invalid 'data:' URIs.  An unauthenticated, remote attacker can exploit this to partially bypass same-origin policy protections. (CVE-2016-2825)
 - A use-after-free error exists that is triggered when destroying the recycle pool of a texture used during the processing of WebGL content.  An unauthenticated, remote attacker can exploit this to dereference already freed memory, resulting in the execution of arbitrary code. (CVE-2016-2828)
 - A flaw exists in 'browser/modules/webrtcUI.jsm' that is triggered when handling a large number of permission requests over a small period of time.  An unauthenticated, remote attacker can exploit this to cause the incorrect icon to be displayed in a given permission request, potentially resulting in a user approving unintended permission requests. (CVE-2016-2829)
 - A flaw exists that is triggered when handling paired fullscreen and pointerlock requests in combination with closing windows.  An unauthenticated, remote attacker can exploit this to create an unauthorized pointerlock, resulting in a denial of service condition.  Additionally, an attacker can exploit this to conduct spoofing and clickjacking attacks. (CVE-2016-2831)
 - An information disclosure vulnerability exists that is triggered when handling CSS pseudo-classes.  An unauthenticated, remote attacker can exploit this disclose a list of installed plugins. (CVE-2016-2832)
 - A Content Security Policy (CSP) bypass exists that is triggered when handling specially crafted cross-domain Java applets.  An unauthenticated, remote attacker can exploit this to bypass the CSP and conduct cross-site scripting attacks. (CVE-2016-2833)
 - Multiple unspecified flaws exist in the Mozilla Network Security Services (NSS) component that allow an attacker to have an unspecified impact. (CVE-2016-2834)

ID	名稱	產品	系列	已發布	已更新	嚴重性
91536	RHEL 5/6/7：firefox (RHSA-2016:1217)	Nessus	Red Hat Local Security Checks	2016/6/9	2020/5/29	high
91544	Firefox ESR 45.x < 45.2 多种漏洞 (Mac OS X)	Nessus	MacOS X Local Security Checks	2016/6/9	2019/11/19	high
91557	Ubuntu 14.04 LTS / 16.04 LTS：Firefox 漏洞 (USN-2993-1)	Nessus	Ubuntu Local Security Checks	2016/6/10	2024/8/27	high
92957	Debian DSA-3647-1：icedove - 安全更新	Nessus	Debian Local Security Checks	2016/8/15	2021/1/11	high
9382	Mozilla Firefox ESR < 45.2 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	2016/6/24	2019/11/6	high
9383	Mozilla Firefox < 47.0 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	2016/6/24	2019/3/6	high

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