USN-975-2: Firefox and Xulrunner regression

16 September 2010

This update provides stability updates for Firefox and Xulrunner.

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USN-975-1 fixed vulnerabilities in Firefox and Xulrunner. Some users
reported stability problems under certain circumstances. This update fixes
the problem.

We apologize for the inconvenience.

Original advisory details:

Several dangling pointer vulnerabilities were discovered in Firefox. An
attacker could exploit this to crash the browser or possibly run arbitrary
code as the user invoking the program. (CVE-2010-2760, CVE-2010-2767,
CVE-2010-3167)

Blake Kaplan and Michal Zalewski discovered several weaknesses in the
XPCSafeJSObjectWrapper (SJOW) security wrapper. If a user were tricked into
viewing a malicious site, a remote attacker could use this to run arbitrary
JavaScript with chrome privileges. (CVE-2010-2762)

Matt Haggard discovered that Firefox did not honor same-origin policy when
processing the statusText property of an XMLHttpRequest object. If a user
were tricked into viewing a malicious site, a remote attacker could use
this to gather information about servers on internal private networks.
(CVE-2010-2764)

Chris Rohlf discovered an integer overflow when Firefox processed the HTML
frameset element. If a user were tricked into viewing a malicious site, a
remote attacker could use this to crash the browser or possibly run
arbitrary code as the user invoking the program. (CVE-2010-2765)

Several issues were discovered in the browser engine. If a user were
tricked into viewing a malicious site, a remote attacker could use this to
crash the browser or possibly run arbitrary code as the user invoking the
program. (CVE-2010-2766, CVE-2010-3168)

David Huang and Collin Jackson discovered that the tag could
override the charset of a framed HTML document in another origin. An
attacker could utilize this to perform cross-site scripting attacks.
(CVE-2010-2768)

Paul Stone discovered that with designMode enabled an HTML selection
containing JavaScript could be copied and pasted into a document and have
the JavaScript execute within the context of the site where the code was
dropped. An attacker could utilize this to perform cross-site scripting
attacks. (CVE-2010-2769)

A buffer overflow was discovered in Firefox when processing text runs. If a
user were tricked into viewing a malicious site, a remote attacker could
use this to crash the browser or possibly run arbitrary code as the user
invoking the program. (CVE-2010-3166)

Peter Van der Beken, Jason Oster, Jesse Ruderman, Igor Bukanov, Jeff
Walden, Gary Kwong and Olli Pettay discovered several flaws in the
browser engine. If a user were tricked into viewing a malicious site, a
remote attacker could use this to crash the browser or possibly run
arbitrary code as the user invoking the program. (CVE-2010-3169)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 9.10
Ubuntu 9.04
Ubuntu 8.04
Ubuntu 10.04

After a standard system update you need to restart Firefox and any
applications that use Xulrunner to make all the necessary changes.

References

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