Internet Explorer URL Compression Buffer Overflow - Secunia Advisories - Vulnerability Intelligence

Internet Explorer URL Compression Buffer Overflow
Secunia Advisory:	SA21557	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2006-08-23
Last Update:	2006-08-27
Popularity:	26,865 views

Critical:	Highly critical
Impact:	System access
Where:	From remote
Solution Status:	Vendor Patch

Software:	Microsoft Internet Explorer 6.x

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2006-3869

Description: A vulnerability has been reported in Internet Explorer, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused due to a boundary error in the "CMimeFt::Start()" function within urlmon.dll when processing URLs on a website using HTTP 1.1 and compression. This can be exploited to cause a heap-based buffer overflow via an overly long URL (more than 260 bytes). Successful exploitation allows execution of arbitrary code when a user is e.g. tricked into visiting a malicious website. The vulnerability affects Internet Explorer 6 SP1 on Windows 2000 and Windows XP SP1 and was introduced by the MS06-042 patches. Solution: Apply patch. Internet Explorer 6 SP1 on Windows 2000 SP4 or Windows XP SP1: http://www.microsoft.com/downloads/de...=C335CAA9-B9E6-403D-A039-2D3DCA723653 Provided and/or discovered by: Independently discovered by: * Dejan Kovacevic, Bold Internet Solutions. * Derek Soeder, eEye Digital Security. * Hu Qianwei, NSFocus Security Team. Changelog: 2006-08-23: Added additional information. 2006-08-25: Added details and updated "Solution" section. 2006-08-27: Updated link to vendor advisory. Original Advisory: MS06-042 (KB918899): http://www.microsoft.com/technet/security/bulletin/MS06-042.mspx Microsoft: http://www.microsoft.com/technet/security/advisory/923762.mspx http://support.microsoft.com/kb/923762/ http://blogs.technet.com/msrc/archive/2006/08/24/449860.aspx eEye Digital Security: http://research.eeye.com/html/advisories/published/AD20060824.html NSFocus Security Team: http://www.nsfocus.com/english/homepage/research/0608.htm Other References: US-CERT VU#821156: http://www.kb.cert.org/vuls/id/821156

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