Microsoft IIS ASP chunked encoding heap buffer overflow
| iis-asp-chunked-encoding-bo (8795) |  High Risk |
Description:
Microsoft Internet Information Server (IIS) is vulnerable to a buffer overflow in the function that enables the chunked encoding data transfer mechanism, which is part of the ISAPI (Internet Services Application Programming Interface) extension that implements Active Server Pages (ASP). Chunked encoding is a process by which a client generates a variable sized "chunk" of data and notifies the Web server of the data's size before transferring it, so that the Web server can allocate a buffer of the correct size. By sending a specially-crafted "chunk" of data that causes the incorrect buffer size to be allocated, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the IIS service to fail.
Consequences:
Gain Access
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS02-018. See References.
For IIS:
Microsoft originally provided a patch for this vulnerability in MS02-018, but it was superseded by the patch released with MS02-062, and then superseded by the patch released with MS03-018. See References.
Note: This vulnerability also affects serveral Cisco products running IIS. For affected products and upgrade or patch information refer to Cisco Security Advisory: Cisco Security Advisory: Microsoft IIS Vulnerabilities in Cisco Products - MS02-018. See References.
References:
- BugTraq Mailing List, Sat May 04 2002 - 10:42:52 CDT: Windows 2000 Server IIS 5.0 .ASP Overflow Exploit.
- CERT Advisory CA-2002-09: Multiple Vulnerabilities in Microsoft IIS.
- CIAC Information Bulletin M-066: Microsoft Cumulative Patch for Internet Information Services (IIS) Vulnerabilities.
- Cisco Systems Inc. Security Advisory, 2002 April 15 18:00 (UTC -0400): Microsoft IIS Vulnerabilities in Cisco Products - MS02-018.
- eEye Digital Security Advisory AD20020410: Windows 2000 and NT4 IIS .ASP Remote Buffer Overflow.
- Internet Security Systems Security Alert #114: Multiple Remote Vulnerabilities in Microsoft IIS.
- Microsoft Knowledge Base Article 319688: MS02-018: Patch Available for Chunked Encoding Transfer Mechanism Vulnerability.
- Microsoft Knowledge Base Article 319733: MS02-018: April 2002 Cumulative Patch for Internet Information Services.
- Microsoft Security Bulletin MS02-018: Cumulative Patch for Internet Information Services (Q319733).
- Microsoft Security Bulletin MS02-062: Cumulative Patch for Internet Information Service (Q327696).
- Microsoft Security Bulletin MS03-018: Cumulative Patch for Internet Information Service (811114).
- National Infrastructure Protection Center Advisory 02-002: Multiple Remote Vulnerabilities in Microsoft's Internet Information Services (IIS).
- VulnWatch Mailing List, Fri Mar 21 2003 - 12:36:33 CST: iis 0day exploit.
- BID-4485: Microsoft IIS Chunked Encoding Transfer Heap Overflow Vulnerability
- CVE-2002-0079: Buffer overflow in the chunked encoding transfer mechanism in Internet Information Server (IIS) 4.0 and 5.0 Active Server Pages allows attackers to cause a denial of service or execute arbitrary code.
- US-CERT VU#610291: Microsoft Internet Information Server (IIS) 4.0 and 5.0 buffer overflow in chunked encoding transfer mechanism for ASP
Platforms Affected:
- Microsoft Internet Information Server 4.0
- Microsoft Internet Information Server 5.0
Reported:
Apr 10, 2002
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For corrections or additions please email xforce@iss.net