SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionUSN-1400-1 fixed vulnerabilities in Firefox. Firefox 11 started using GSettings to access the system proxy settings. If there is a GSettings proxy settings schema, Firefox will consume it. The GSettings proxy settings schema that was shipped by default was unused by other applications and broke Firefox's ability to use system proxy settings.
This update removes the unused schema. We apologize for the inconvenience.
Atte Kettunen discovered a use-after-free vulnerability in Firefox's handling of SVG animations. An attacker could potentially exploit this to execute arbitrary code with the privileges of the user invoking Firefox. (CVE-2012-0457)
Atte Kettunen discovered an out of bounds read vulnerability in Firefox's handling of SVG Filters. An attacker could potentially exploit this to make data from the user's memory accessible to the page content. (CVE-2012-0456)
Mike Brooks discovered that using carriage return line feed (CRLF) injection, one could introduce a new Content Security Policy (CSP) rule which allows for cross-site scripting (XSS) on sites with a separate header injection vulnerability. With cross-site scripting vulnerabilities, if a user were tricked into viewing a specially crafted page, a remote attacker could exploit this to modify the contents, or steal confidential data, within the same domain.
Daniel Glazman discovered that the Cascading Style Sheets (CSS) implementation is vulnerable to crashing due to modification of a keyframe followed by access to the cssText of the keyframe. If the user were tricked into opening a specially crafted web page, an attacker could exploit this to cause a denial of service via application crash, or potentially execute code with the privileges of the user invoking Firefox. (CVE-2012-0459)
Matt Brubeck discovered that Firefox did not properly restrict access to the window.fullScreen object. If the user were tricked into opening a specially crafted web page, an attacker could potentially use this vulnerability to spoof the user interface. (CVE-2012-0460)
Bob Clary, Christian Holler, Jesse Ruderman, Michael Bebenita, David Anderson, Jeff Walden, Vincenzo Iozzo, and Willem Pinckaers discovered memory safety issues affecting Firefox. If the user were tricked into opening a specially crafted page, an attacker could exploit these to cause a denial of service via application crash, or potentially execute code with the privileges of the user invoking Firefox. (CVE-2012-0461, CVE-2012-0462, CVE-2012-0464).
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected gsettings-desktop-schemas package.