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Internet Explorer "document.open()" Method Spoofing Vulnerability
Secunia Advisory: SA26069
Release Date: 2007-07-16
Last Update: 2007-10-09
Popularity: 14,682 views

Critical:
Less critical
Impact: Spoofing
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft Internet Explorer 7.x

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CVE reference:CVE-2007-3826


Description:
Michal Zalewski has discovered a vulnerability in Internet Explorer, which can be exploited by a malicious website to spoof the address bar.

The vulnerability is caused due to an error in the handling of the "document.open()" method and can be exploited to spoof the address bar if e.g. the user enters a new website manually in the address bar, which is commonly exercised as best practice.

The vulnerability is confirmed on a fully patched Windows XP SP2 system running Internet Explorer 7. Other versions may also be affected.

Solution:
Apply patches.

Windows XP SP2 and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=4CA0AC93-BF51-40FE-A1BA-CB3E0A36D8B5

Windows XP Professional x64 Edition (optionally with SP2) and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=DBD284D0-2664-42A4-AD16-A0535244C81C

Windows Server 2003 SP1/SP2 and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=0A31C451-32F4-4551-AE45-D600F8B3B11B

Windows Server 2003 x64 Edition (optionally with SP2) and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=C1915633-D181-4CA1-A4F0-7CA0F865AA72

Windows Server 2003 with SP1/SP2 for Itanium-based systems and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=093A2250-3BE3-494F-80E0-89CA7217030F

Windows Vista and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=86392E8D-098C-427F-A233-699CDB9375AE

Windows Vista x64 Edition and Internet Explorer 7:
http://www.microsoft.com/downloads/de...=62490E6D-0A21-4A15-90BD-63CA8F8886B6

Provided and/or discovered by:
Michal Zalewski

Changelog:
2007-07-19: Added CVE reference.
2007-10-09: Updated "Solution" section. Added link to Microsoft security bulletin.

Original Advisory:
MS07-057 (KB939653):
http://www.microsoft.com/technet/security/Bulletin/MS07-057.mspx

http://lists.grok.org.uk/pipermail/full-disclosure/2007-July/064636.html


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