3301 : Microsoft IIS ASP Chunked Encoding Variant Heap Overflow
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
1	705	over 6 years ago	over 2 years ago	0 times	90%

Timeline

Discovery Date	Disclosure Date	Exploit Publish Date
2002-04-10	2002-04-10	2002-04-10

Description

A remote overflow exists in IIS Active Server Pages (ASP). IIS fails to allocate the proper size buffer resulting in a heap-based overflow. With a specially crafted request, an attacker can cause either a DoS or execution of arbitrary code, resulting in a loss of confidentiality, integrity, and/or availability.

Classification

Location: Remote / Network Access
Attack Type: Input Manipulation
Impact: Loss of Confidentiality, Loss of Integrity, Loss of Availability
Exploit: Exploit Public
Disclosure: OSVDB Verified

Technical

This bug is almost exactly like OSVDB ID#768, except that it is caused by a different component of the ASP data transfer process and does affect IIS version 5.1.

Solution

Install Patch Q319733, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the following workaround(s):

1. Disable ASP - Version 1.0 of the IIS Lockdown Tool disables ASP by default, and version 2.1 disables ASP if "Static Web Server" is selected.

2. The URLScan tool can be used to prevent chunked encoding requests.

Products

Microsoft Corporation	IIS	4.0
		5.0
		5.1

References

CVE ID: 2002-0147 (see also: NVD)
Bugtraq ID: 4490
CERT VU: 669779
Related OSVDB ID: 768
ISS X-Force ID: 8796
CERT: CA-2002-09
Other Advisory URL: http://archives.neohapsis.com/archives/sans/2002/0046.html
http://www.iss.net/security_center/alerts/advise114.php
http://www.nipc.gov/warnings/advisories/2002/02-002.htm
Vendor Specific Advisory URL: http://www.cisco.com/warp/public/707/Microsoft-IIS-vulnerabilities-MS02-018.shtml
Vendor Specific Solution URL: http://www.microsoft.com/downloads/search.asp?Search=Keyword&Value='security_patch'&OpSysID=1
http://www.microsoft.com/technet/security/tools/locktool.asp
CIAC Advisory: m-066
Microsoft Security Bulletin: MS02-018

Tools & Filters

Nikto	325 326 485 3373
	10935 10943

Credit

Unknown or Incomplete

CVSSv2 Score

CVSSv2 Base Score = 7.5
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

Blogs

This product uses the Daylife API but is not endorsed or certified by Daylife.

This section lists the latest news and blogs found via the daylife API (and for older items, the technorati API), which mention or otherwise discuss this vulnerability.

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