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TITLE:
Apache HTTP Server "ap_pregsub()" Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA45793

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45793/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45793

RELEASE DATE:
2011-11-02

DISCUSS ADVISORY:
http://secunia.com/advisories/45793/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/45793/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=45793

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
halfdog has discovered a vulnerability in Apache HTTP Server, which
can be exploited by malicious, local users to gain escalated
privileges.

The vulnerability is caused due to an integer overflow within the
"ap_pregsub()" function (server/utils.c) and can be exploited to
cause a heap-based buffer overflow via a specially crafted
".htaccess" file.

The vulnerability is confirmed in versions 2.0.64 and 2.2.21. Other
versions may also be affected.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
halfdog

ORIGINAL ADVISORY:
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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