[NT] Microsoft IE6 urlmon.dll Long URL Buffer Overflow

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Microsoft IE6 urlmon.dll Long URL Buffer Overflow
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SUMMARY

NSFocus Security Team discovered a buffer overflow in IE 6.0SP1 which
allows remote code execution via an over-long URL.

DETAILS

Security Bulletin MS06-042 released by Microsoft on August 8th, 2006 fixed
multiple vulnerabilities, but the update for IE 6 introduced a new
vulnerability.

When visiting websites with HTTP/1.1 protocol and data compression
enabled, a buffer overflow might occur if an over-long URL is passed to IE
6. This overflow arises due to an incorrect call to function lstrncpyA,
possibly resulting in heap data structure corruption. Carefully crafted
data might lead to arbitrary code execution.

Attackers might craft a malicious WEB page and allure users to visit it in
order to run arbitrary code with the users' privilege. If the user is the
administrator, the attacker might gain complete control over the system.
Attackers might host malicious web servers of their own, or exploit
certain servers that enable HTTP/1.1 protocol and data compression in
order to launch attacks.

Workaround:
Temporarily disable HTTP 1.1 support in IE.

Vendor Status:
2006.08.10 - Informed the vendor
2006.08.17 - Vendor confirmed the vulnerability
2006.08.24 - Microsoft released related patch and re-released MS06-042.

Detailed Microsoft Security Bulletin is available at:
<http://www.microsoft.com/technet/security/bulletin/MS06-042.mspx>
http://www.microsoft.com/technet/security/bulletin/MS06-042.mspx

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3869>
CVE-2006-3869


ADDITIONAL INFORMATION

The information has been provided by <mailto:security@xxxxxxxxxxx>
NSFOCUS Security Team.
The original article can be found at:
<http://www.nsfocus.com/english/homepage/research/0608.htm>
http://www.nsfocus.com/english/homepage/research/0608.htm



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