bugtraq - Firefox 3.6.13 pseudo-URL SOP check bug (CVE-2010-3774)

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Message-ID: <AANLkTimO=LCnt9Z1Ph8ZZzCL=WxM_ktMqUgX+Ur2teWz@mail.gmail.com>
Date: Thu, 9 Dec 2010 10:58:45 -0800
From: Michal Zalewski <lcamtuf@...edump.cx>
To: bugtraq <bugtraq@...urityfocus.com>,
	full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Firefox 3.6.13 pseudo-URL SOP check bug (CVE-2010-3774)

Hi folks,

Firefox 3.6.13 fixes an interesting bug in their same-origin policy
logic for pseudo-URLs that do not have any inherent origin associated
with them. These documents are normally expected to inherit the
context from their parent, or be assigned a unique one. This didn't
work as expected in Firefox, apparently due to a code refactoring in
2008. The vulnerability permits malicious websites to access and
modify the contents of special pages such as about:neterror or
about:config, which has consequences ranging from content spoofing to
complete subversion of the browser security model.

More info: http://lcamtuf.blogspot.com/2010/12/firefox-3613-damn-you-corner-cases.html
Whimsical PoC: http://lcamtuf.coredump.cx/ffabout/

PS. I posted a couple of probably interesting browser security
write-ups on my blog of recent, recapping the status quo in areas such
as HTTP cookie security. Some readers might find them interesting /
useful - say: http://lcamtuf.blogspot.com/2010/10/http-cookies-or-how-not-to-design.html

Cheers,
/mz