1210 : Microsoft IIS WebHits.dll ISAPI Filter Traversal Arbitrary File Access
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Info

Last Modified

6 months ago

Percent Complete

100%

Disclosure

Jan 27, 2000

Discovery

Unknown

Dates

Exploit

Jan 27, 2000

Solution

Unknown

Description

Microsoft IIS contains a flaw that allows a remote attacker to access arbitrary files outside of the web path. The issue is due to the webhits.dll library not properly sanitizing user input, specifically traversal style attacks (../../) supplied via the "CiWebHitsFile" variable. By supplying a crafted request to an htw script, it is possible to read arbitrary files on the system.

Classification

Location: Remote/Network Access Required
Attack Type: Input Manipulation
Impact: Loss of Confidentiality, Loss of Integrity
Exploit: Exploit Available
Disclosure: OSVDB Verified
OSVDB: Web Related

Technical

Sample .htw files often installed and left on the system which can be used to exploit this vulnerability:
/iissamples/issamples/oop/qfullhit.htw
/iissamples/issamples/oop/qsumrhit.htw
/iissamples/exair/search/qfullhit.htw
/iissamples/exair/search/qsumrhit.htw
/iishelp/iis/misc/iirturnh.htw
/scripts/samples/search/qfullhit.htw
/scripts/samples/search/qsumrhit.htw

Solution

Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability.

Products

Microsoft Corporation	IIS	4.0
		5.0
	Index Server	2.0

References

Bugtraq ID: 950
Microsoft Knowledge Base Article: 251170 328832
Microsoft Security Bulletin: MS00-006
Other Advisory URL: http://www.atstake.com/research/advisories/2000/adviishtw.html
ISS X-Force ID: 3884
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2007-05/0313.html
http://archives.neohapsis.com/archives/ntbugtraq/2000-q1/0066.html
CVE ID: 2000-0097 (see also: NVD)
Keyword: aka the "Malformed Hit-Highlighting Argument" vulnerability. Directory Traversal

Tools & Filters

Nikto	516 517 1246 1247 1248 1467
Nessus	10356
Snort	1019 1044 1073

Manual Testing Notes

Credit

David Litchfield - davidngssoftware.com - NGSSoftware

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