Vulnerability Note VU#280613

Apache mod_isapi module library unload results in orphaned callback pointers

Overview

The Apache mod_isapi module can be forced to unload a specific library before the processing of a request is complete, resulting in memory corruption. This vulnerability may allow a remote attacker to execute arbitrary code.

I. Description

The Apache HTTP server running on Windows platforms contains a flaw in mod_isapi which could enable an attacker to unload ISAPI.dll before request processing is complete. An attacker can send a specially-crafted request and RESET packet to the server, resulting in ISAPI.dll being unloaded. Additional requests can result in memory corruption.

This vulnerability affects Apache httpd versions 2.2.14, 2.2.13, 2.2.12, 2.2.11, 2.2.10, 2.2.9, 2.2.8, 2.2.6, 2.2.5, 2.2.4, 2.2.3, 2.2.2, 2.2.0, 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, and 2.0.37.

II. Impact

A remote, unauthenticated attacker may be able to cause a denial of service condition or execute arbitrary code on the system with the privileges of the Apache process. Because the Apache service typically runs with SYSTEM privileges on Windows platforms, an attacker may be able to gain complete control of the system.

III. Solution

Apply Patch

The Apache Software Foundation has released httpd 2.2.15 and 2.0.64-dev, which address this and other issues. Updates can be found on the Apache httpd website.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Apache HTTP Server Project	Vulnerable		2010-03-11

References

http://httpd.apache.org/security/vulnerabilities_22.html
http://httpd.apache.org/security/vulnerabilities_20.html
http://secunia.com/advisories/38776/
http://svn.apache.org/viewvc?view=revision&revision=917875
http://svn.apache.org/viewvc?view=revision&revision=917870
https://issues.apache.org/bugzilla/show_bug.cgi?id=48359
http://www.senseofsecurity.com.au/advisories/SOS-10-002

Credit

Apache credits Brett Gervasoni of Sense of Security for reporting the issue.

This document was written by David Warren.

Other Information

Date Public:	2010-03-02
Date First Published:	2010-03-11
Date Last Updated:	2010-03-11
CERT Advisory:	03/08/2010
CVE-ID(s):	CVE-2010-0425
NVD-ID(s):	CVE-2010-0425
US-CERT Technical Alerts:
Severity Metric:	0.00
Document Revision:	19

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