Even though Firefox 1.0.1 patched one of the key bugs behind my
firescrolling exploit (the ability of plugins to load chrome files in a
hidden frame) the ability to hijack a drag and drop operation and open a
privileged xul file is still available.
The demo opens "chrome://global/content/alerts/alert.xul" when dragging the
scrollbar the first time. This XUL file automaticly runs an inline script to
turn the window into a tray notification alert. This demo is just an example
of an annoying usage, but if the browser or an extension contains an inline
script that uses an eval/setTimeout with a parameter an attacker can
influence it turns into an arbitrary code execution bug. Also update or
uninstall scripts could be a valuable target. I doubt most extension
developers think about problems that could occure if a XUL file in their
extensions is opened directly.
__Proof-of-Concept
http://www.mikx.de/firescrolling2/
__Status
The bug is fixed in Firefox 1.0.2.
2005-03-09 Vendor informed (bugzilla.mozilla.org #285438)
2005-03-11 Vendor confirmed bug
2005-03-23 Vendor published fixed version and advisory
2005-03-24 Public disclosure
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2005-0401 to this issue.
__Affected Software
Tested with Firefox 1.0.1
__Contact Informations
Michael Krax <mikx (at) mikx (dot) de [email concealed]>
http://www.mikx.de/?p=12
Even though Firefox 1.0.1 patched one of the key bugs behind my
firescrolling exploit (the ability of plugins to load chrome files in a
hidden frame) the ability to hijack a drag and drop operation and open a
privileged xul file is still available.
The demo opens "chrome://global/content/alerts/alert.xul" when dragging the
scrollbar the first time. This XUL file automaticly runs an inline script to
turn the window into a tray notification alert. This demo is just an example
of an annoying usage, but if the browser or an extension contains an inline
script that uses an eval/setTimeout with a parameter an attacker can
influence it turns into an arbitrary code execution bug. Also update or
uninstall scripts could be a valuable target. I doubt most extension
developers think about problems that could occure if a XUL file in their
extensions is opened directly.
__Proof-of-Concept
http://www.mikx.de/firescrolling2/
__Status
The bug is fixed in Firefox 1.0.2.
2005-03-09 Vendor informed (bugzilla.mozilla.org #285438)
2005-03-11 Vendor confirmed bug
2005-03-23 Vendor published fixed version and advisory
2005-03-24 Public disclosure
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2005-0401 to this issue.
__Affected Software
Tested with Firefox 1.0.1
__Contact Informations
Michael Krax <mikx (at) mikx (dot) de [email concealed]>
http://www.mikx.de/?p=12
mikx
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