Several flaws were discovered in the browser engine. These problems could allow an attacker to crash the browser and possibly execute arbitrary code with user privileges. (CVE-2008-5500)
Boris Zbarsky discovered that the same-origin check in Firefox could be bypassed by utilizing XBL-bindings. An attacker could exploit this to read data from other domains. (CVE-2008-5503)
18 December 2008
A security issue affects these releases of Ubuntu and its derivatives:
Several flaws were discovered in the browser engine. These problems could allow an attacker to crash the browser and possibly execute arbitrary code with user privileges. (CVE-2008-5500)
Boris Zbarsky discovered that the same-origin check in Firefox could be bypassed by utilizing XBL-bindings. An attacker could exploit this to read data from other domains. (CVE-2008-5503)
Several problems were discovered in the JavaScript engine. An attacker could exploit feed preview vulnerabilities to execute scripts from page content with chrome privileges. (CVE-2008-5504)
Marius Schilder discovered that Firefox did not properly handle redirects to an outside domain when an XMLHttpRequest was made to a same-origin resource. It’s possible that sensitive information could be revealed in the XMLHttpRequest response. (CVE-2008-5506)
Chris Evans discovered that Firefox did not properly protect a user’s data when accessing a same-domain Javascript URL that is redirected to an unparsable Javascript off-site resource. If a user were tricked into opening a malicious website, an attacker may be able to steal a limited amount of private data. (CVE-2008-5507)
Chip Salzenberg, Justin Schuh, Tom Cross, and Peter William discovered Firefox did not properly parse URLs when processing certain control characters. (CVE-2008-5508)
Kojima Hajime discovered that Firefox did not properly handle an escaped null character. An attacker may be able to exploit this flaw to bypass script sanitization. (CVE-2008-5510)
Several flaws were discovered in the Javascript engine. If a user were tricked into opening a malicious website, an attacker could exploit this to execute arbitrary Javascript code within the context of another website or with chrome privileges. (CVE-2008-5511, CVE-2008-5512)
Flaws were discovered in the session-restore feature of Firefox. If a user were tricked into opening a malicious website, an attacker could exploit this to perform cross-site scripting attacks or execute arbitrary Javascript code with chrome privileges. (CVE-2008-5513)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to restart Firefox to effect the necessary changes.
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