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USN-546-2: Firefox regression

4 December 2007

Firefox regression




USN-546-1 fixed vulnerabilities in Firefox. The upstream update included
a faulty patch which caused the drawImage method of the canvas element to
fail. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Firefox incorrectly associated redirected sites
as the origin of "jar:" contents. A malicious web site could exploit this
to modify or steal confidential data (such as passwords) from other web
sites. (CVE-2007-5947)

Various flaws were discovered in the layout and JavaScript engines. By
tricking a user into opening a malicious web page, an attacker could
execute arbitrary code with the user's privileges. (CVE-2007-5959)

Gregory Fleischer discovered that it was possible to use JavaScript to
manipulate Firefox's Referer header. A malicious web site could exploit
this to conduct cross-site request forgeries against sites that relied
only on Referer headers for protection from such attacks. (CVE-2007-5960)

Update instructions

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

Ubuntu 7.10
Ubuntu 7.04
Ubuntu 6.10

After a standard system upgrade you need to restart Firefox to effect
the necessary changes.