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Ubuntu: New Linux packages fix security vulnerabilities

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. Marc Schoenefeld discovered that using Firebug to profile a JavaScript file 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.

Researchers 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 service. 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. 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 Firefox.

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.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1277-1
November 23, 2011

firefox vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04

Summary:

Multiple vulnerabilities have been fixed in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

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.
(CVE-2011-3648)

Marc Schoenefeld discovered that using Firebug to profile a JavaScript file
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.
(CVE-2011-3650)

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
service. (CVE-2011-3651)

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
Firefox. (CVE-2011-3654)

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.
(CVE-2011-3655)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 11.10:
 firefox                         8.0+build1-0ubuntu0.11.10.3

Ubuntu 11.04:
 firefox                         8.0+build1-0ubuntu0.11.04.3

After a standard system update you need to restart Firefox to make
all the necessary changes.

References:
 http://www.ubuntu.com/usn/usn-1277-1
 CVE-2011-3648, CVE-2011-3650, CVE-2011-3651, CVE-2011-3652,
 CVE-2011-3654, CVE-2011-3655, https://launchpad.net/bugs/887339

Package Information:
 https://launchpad.net/ubuntu/+source/firefox/8.0+build1-0ubuntu0.11.10.3
 https://launchpad.net/ubuntu/+source/firefox/8.0+build1-0ubuntu0.11.04.3
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