Firelinking [Firefox 1.0.2]
From: mikx (mikx_at_MIKX.DE)
Date: 04/18/05
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Date: Mon, 18 Apr 2005 12:58:45 +0200 To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM
__Notice
I really wonder why the Mozilla Foundation decided to release a serious
security update on a friday night and to disclose the link to my
proof-of-concept code so quickly. It wasn't intendet from my side to release
this as a 0day exploit. Please complain to security@mozilla.org if you
disagree with their release policy.
__Summary
The link tag allows to load a custom image as the icon for a website,
displayed in the location bar and in the tab title.
By setting the href attribute of this tag to a javascript url, it is
possible to call chrome functions and run arbitrary code without user
interaction.
__Proof-of-Concept
http://www.mikx.de/firelinking/
__Status
The bug is fixed in Firefox 1.0.3. Disable Javascript as a workaround.
2005-04-12 Vendor informed (bugzilla.mozilla.org #290036)
2005-04-12 Vendor confirmed bug
2005-04-15 Vendor published fix, advisory and link to PoC (mfsa2005-37)
2005-04-18 This advisory
__Affected Software
Tested with Firefox 1.0.2
__Contact Informations
Michael Krax <mikx@mikx.de>
http://www.mikx.de/?p=15
mikx
-- NTBugtraq Editor's Note: Most viruses these days use spoofed email addresses. As such, using an Anti-Virus product which automatically notifies the perceived sender of a message it believes is infected may well cause more harm than good. Someone who did not actually send you a virus may receive the notification and scramble their support staff to find an infection which never existed in the first place. Suggest such notifications be disabled by whomever is responsible for your AV, or at least that the idea is considered. --
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