Ubuntu Security Notice USN-1277-2
November 23, 2011
mozvoikko, ubufox update
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
This update provides packages compatible with Firefox 8.
- mozvoikko: Finnish spell-checker extension for Firefox
- ubufox: Ubuntu Firefox specific configuration defaults and apt support
USN-1277-1 fixed vulnerabilities in Firefox. This update provides updated
Mozvoikko and ubufox packages for use with Firefox 8.
Original advisory details:
Yosuke Hasegawa discovered that the Mozilla browser engine mishandled
invalid sequences in the Shift-JIS encoding. It may be possible to trigger
this crash without the use of debugging APIs, which might allow malicious
websites to exploit this vulnerability. An attacker could possibly use this
flaw this to steal data or inject malicious scripts into web content.
with many functions would cause Firefox to crash. An attacker might be able
to exploit this without using the debugging APIs, which could potentially
remotely crash the browser, resulting in a denial of service.
Jason Orendorff, Boris Zbarsky, Gregg Tavares, Mats Palmgren, Christian
Holler, Jesse Ruderman, Simona Marcu, Bob Clary, and William McCloskey
discovered multiple memory safety bugs in the browser engine used in
Firefox and other Mozilla-based products. An attacker might be able to use
these flaws to execute arbitrary code with the privileges of the user
invoking Firefox or possibly crash the browser resulting in a denial of
It was discovered that Firefox could be caused to crash under certain
conditions, due to an unchecked allocation failure, resulting in a denial
of service. It might also be possible to execute arbitrary code with the
privileges of the user invoking Firefox. (CVE-2011-3652)
Aki Helin discovered that Firefox does not properly handle links from SVG
mpath elements to non-SVG elements. An attacker could use this
vulnerability to crash Firefox, resulting in a denial of service, or
possibly execute arbitrary code with the privileges of the user invoking
It was discovered that an internal privilege check failed to respect the
NoWaiverWrappers introduced with Firefox 4. An attacker could possibly use
this to gain elevated privileges within the browser for web content.
The problem can be corrected by updating your system to the following
After a standard system update you need to restart Firefox to make
all the necessary changes.