Bug: MSIE7 browser entrapment vulnerability (probably Firefox, too) ( Ascii Version )

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MSIE7 browser entrapment vulnerability (probably Firefox, too)

Published
Credit
Risk
2007.03.02
Michal Zalewski
Low
CWE
CVE
Local
Remote
CWE-DesignError
CVE-2007-1095
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

There is a cool combination-type vulnerability in MSIE7 that allows the
attacker to:

a) Trap the visitor in a Matrix-esque tarpit webpage that cannot be left
by normal means (this is a known brain-damaged design of onUnload
Javascript handlers),

b) Spoof transitions between pages so that the user thinks he actually
managed to leave the affected site, and so that the URL bar displays
other addresses we didn't actually go to.

This opens a plethora of spoofing / phishing scenarios, and is generally
quite nasty. More information and a pretty demo is available here:

http://lcamtuf.coredump.cx/ietrap/

Firefox isn't outright vulnerable to this problem, but judging from its
behavior, it is likely to be susceptible to a variant of this bug (it
exhibits the same behavior, but we end up with a corrupted page instead);
I will research it once I get some sleep.

Cheers,
/mz

See this note in TXT Version

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Ascii Version