National Cyber Awareness System
Vulnerability Summary for CVE-2011-4415
Original release date:11/08/2011
Last revised:07/03/2012
Source:
US-CERT/NIST
Overview
The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
2.9
Exploitability Subscore:
1.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
References to Advisories, Solutions, and Tools
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External Source: MISC
Name: http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
Type: Patch Information; Exploit
External Source: MISC
Name: http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html
External Source: CONFIRM
Name: http://www.gossamer-threads.com/lists/apache/dev/403775
External Source: HP
Name: HPSBMU02786
External Source: HP
Name: SSRT100877
