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[USN-1277-1] Firefox vulnerabilities

Posted on 23 November 2011
Ubuntu Security

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

firefox vulnerabilities
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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 trigge=
r
this crash without the use of debugging APIs, which might allow malicious=

websites to exploit this vulnerability. An attacker could possibly use th=
is
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 fi=
le
with many functions would cause Firefox to crash. An attacker might be ab=
le
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 us=
e
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 us=
e
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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