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Update: Firefox update will patch CSRF bug, Mozilla says

Gregg Keizer | Feb. 23, 2011
Delayed Firefox 3.6.14, 3.5.17 to ship March 1, fix cross-site request forgery bug that can be exploited via Flash

FRAMINGHAM 23 FEBRUARY 2011 - Mozilla said late Wednesday that it will ship security updates to Firefox 3.5 and Firefox 3.6 next week that will include a patch for a bug that can be exploited using a malicious Adobe Flash file.

(Editor's note: An earlier version of this story, published before Mozilla responded to a request for comment, said company meeting notes suggested that the Firefox security updates would not include the patch.)

Firefox 3.5.17 and Firefox 3.6.14 will now appear Tuesday, March 1, Mozilla disclosed in meeting notes published today.

Originally slated for release Feb. 14, the security updates were held while Mozilla developers investigated a bug that affected some, though not all, users of the betas. According to Mozilla, the bug caused some copies of the updates to repeatedly crash. Mozilla then backed out a recent fix to retest the betas.

Around the same time, another problem -- a separate cross-site request forgery (CSRF) vulnerability -- surfaced that Mozilla needed to patch. "Adobe is pressing for a release due to a public CSRF issue," Mozilla said last week.

The vulnerability is in Firefox, but Adobe's involved because the vulnerability can be exploited using a malformed Flash file.

According to patch information posted Feb. 8 by the open-source Ruby on Rails Web development framework, and a follow-up message two days later on a security mailing list, the CSRF bug can be exploited by "Certain combinations of browser plug-ins and HTTP redirects."

An attacker could exploit the vulnerability to bypass the built-in CSRF protections of Ruby on Rails -- and that of Django, another Web development platform, which also patched its products earlier this month -- and successfully attack a Web application built with those tools.

The security mailing list message posted Feb. 10 spelled out several affected browsers, including Firefox -- including an earlier beta of Firefox 4 -- as well as Google's Chrome and Apple's Safari on both Windows and Mac OS.

That same message also said that a Google security researcher had first reported the CSRF vulnerability.

Last week, an Adobe spokeswoman said she knew nothing about a potential zero-day that would impact its software and/or Firefox.

Mozilla will patch the CSRF flaw in both Firefox 2.5.17 and Firefox 3.6.14 when they ship next week, a spokeswoman for that company confirmed late Wednesday.

The timing of the update may help Firefox survive the Pwn2Own, the hacking contest that kicks off March 9 at the CanSecWest security conference in Vancouver, British Columbia.


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