Microsoft Internet Explorer HTTP 1.1 compression long URL buffer overflow

ie-long-url-bo (28522)

High Risk

Description:

Microsoft Internet Explorer is vulnerable to a buffer overflow, caused by improper bounds checking of an overly long URL when viewing a Web site using HTTP 1.1 compression. A remote attacker could exploit this vulnerability to cause the victim's browser to crash or execute arbitrary code on the victim's system, if the attacker could persuade the victim to visit a malicious Web page.

Note: This vulnerability was introduced with the release of the MS06-042 update for Internet Explorer on August 8, 2006.

Platforms Affected:

• Microsoft, Internet Explorer 6 SP1
• Microsoft, Windows 2000 Advanced Server
• Microsoft, Windows 2000 SP4
• Microsoft, Windows 2000 Professional
• Microsoft, Windows XP Home
• Microsoft, Windows XP Professional

Remedy:

Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.

As a workaround, disable HTTP 1.1 in Internet Explorer. Refer to Microsoft Security Advisory (923762) for more information. See References.

Consequences:

Gain Access

References:

• BugTraq Mailing List, Fri Aug 25 2006 - 01:55:02 CDT, NSFOCUS SA2006-08 : Microsoft IE6 urlmon.dll Long URL Buffer Overflow Vulnerability at http://archives.neohapsis.com/archives/bugtraq/2006-08/0478.html.
• Full-Disclosure Mailing List, Tue Aug 22 2006 - 15:37:36 CDT, EEYE:ALERT: MS06-042 Related Internet Explorer 'Crash' is Exploitable at http://archives.neohapsis.com/archives/fulldisclosure/2006-08/0595.html.
• Microsoft Knowledgebase Article: 923762, Long URLs to sites using HTTP 1.1 and compression Could Cause Internet Explorer 6 Service Pack 1 to Unexpectedly Exit at http://support.microsoft.com/kb/923762.
• Microsoft Security Advisory (923762), Long URLs to sites using HTTP 1.1 and compression Could Cause Internet Explorer 6 Service Pack 1 to Unexpectedly Exit at http://www.microsoft.com/technet/security/advisory/923762.mspx.
• Microsoft Security Bulletin MS06-042, Cumulative Security Update for Internet Explorer (918899) at http://www.microsoft.com/technet/security/bulletin/MS06-042.mspx.
• Microsoft Security Bulletin MS06-067, Cumulative Security Update for Internet Explorer (922760) at http://www.microsoft.com/technet/security/bulletin/ms06-067.mspx.
• Microsoft Security Bulletin MS06-072, Cumulative Security Update for Internet Explorer (925454) at http://www.microsoft.com/technet/security/Bulletin/MS06-072.mspx.
• Microsoft Security Bulletin MS07-016, Cumulative Security Update for Internet Explorer (928090) at http://www.microsoft.com/technet/security/Bulletin/ms07-016.mspx.
• Microsoft Security Bulletin MS07-027, Cumulative Security Update for Internet Explorer (931768) at http://www.microsoft.com/technet/security/bulletin/ms07-027.mspx.
• Microsoft Security Bulletin MS07-033, Cumulative Security Update for Internet Explorer (933566) at http://www.microsoft.com/technet/security/bulletin/ms07-033.mspx.
• Microsoft Security Bulletin MS07-045, Cumulative Security Update for Internet Explorer (937143) at http://www.microsoft.com/technet/security/bulletin/ms07-045.mspx.
• Microsoft Security Bulletin MS07-057, Cumulative Security Update for Internet Explorer (939653) at http://www.microsoft.com/technet/security/Bulletin/MS07-057.mspx.
• Microsoft Security Bulletin MS07-069, Cumulative Security Update for Internet Explorer (942615) at http://www.microsoft.com/technet/security/bulletin/ms07-069.mspx.
• Microsoft Security Bulletin MS08-010, Cumulative Security Update for Internet Explorer (944533) at http://www.microsoft.com/technet/security/bulletin/ms08-010.mspx.
• Microsoft Security Bulletin MS08-024, Cumulative Security Update for Internet Explorer (947864) at http://www.microsoft.com/technet/security/bulletin/ms08-024.mspx.
• Microsoft Security Bulletin MS08-031, Cumulative Security Update for Internet Explorer (950759) at http://www.microsoft.com/technet/security/Bulletin/MS08-031.mspx.
• Microsoft Security Bulletin MS08-045, Cumulative Security Update for Internet Explorer (953838) at http://www.microsoft.com/technet/security/bulletin/ms08-045.mspx.
• BID-19667: Microsoft Internet Explorer HTTP 1.1 and Compression Long URI Buffer Overflow Vulnerability
• CVE-2006-3869: Heap-based buffer overflow in URLMON.DLL in Microsoft Internet Explorer 6 SP1 on Windows 2000 and XP SP1, with versions the MS06-042 patch before 20060824, allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a long URL on a website that uses HTTP 1.1 compression.
• FrSIRT/ADV-2006-3356: Microsoft Internet Explorer Long URL Parsing Remote Buffer Overflow Vulnerabilities
• OSVDB ID: 28132: Microsoft IE HTTP 1.1 URL Parsing Overflow
• SA21557: Internet Explorer URL Compression Buffer Overflow
• SECTRACK ID: 1016731: Microsoft Internet Explorer URL Buffer Overflow in Processing HTTP 1.1 Protocol with Compression Lets Remote Users Execute Arbitrary Code
• US-CERT VU#821156: Microsoft Internet Explorer long URL buffer overflow

Reported:

Aug 22, 2006

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