19188 : Apache HTTP Server mod_ssl SSLVerifyClient Per-location Context Restriction Bypass
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Info

Last Modified

7 months ago

Percent Complete

90%

Disclosure

Sep 02, 2005

Discovery

Unknown

Dates

Exploit

Unknown

Solution

Unknown

Description

mod_ssl contains a flaw that may allow a malicious user to bypass certain security restrictions. The issue is due to an error in enforcing client-based certificate authentication ("SSLVerifyClient require") in per-location context, if "SSLVerifyClient optional" was configured in the global virtual host configuration. It is possible that the flaw may allow an attacker to bypass client-based certificate authentication, resulting in a loss of confidentiality or integrity.

Classification

Location: Remote/Network Access Required
Attack Type: Authentication Management
Impact: Loss of Confidentiality, Loss of Integrity
Exploit: Exploit Unknown
Disclosure: OSVDB Verified

Solution

Upgrade to version 2.8.24 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Apache Software Foundation

mod_ssl

2.8.23

References

Security Tracker: 1014833
Secunia Advisory ID: 16700 16705 16714 16743 16746 16748 16753 16754 16755 16769 16771 16789 16864 16956 17088 17288 17311 17813 19072 19073 22523
CVE ID: 2005-2700 (see also: NVD)
Keyword: APPLE-SA-2005-11-29 Security Update 2005-009
Vendor Specific Advisory URL: ftp://patches.sgi.com/support/free/security/advisories/20050901-01-U.asc http://sunsolve.sun.com/search/document.do?assetkey=1-26-102197-1
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102198-1
http://www2.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX01232
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2005-11/0354.html
Other Advisory URL: http://docs.info.apple.com/article.html?artnum=302847
http://frontal1.mandriva.com/security/advisories?name=MDKSA-2005:161
http://lists.suse.com/archive/suse-security-announce/2005-Sep/0003.html
http://slackware.com/security/viewer.php?l=slackware-security&y=2005&m=slackware- ......
http://support.avaya.com/elmodocs2/security/ASA-2005-204.pdf
http://www.debian.org/security/2005/dsa-805
http://www.debian.org/security/2005/dsa-807
http://www.gentoo.org/security/en/glsa/glsa-200509-12.xml
http://www.trustix.org/errata/2005/0055/
http://www.ubuntulinux.org/usn/usn-177-1
Vendor Specific Solution URL: http://www.modssl.org/source/mod_ssl-2.8.24-1.3.33.tar.gz
Vendor Specific News/Changelog Entry: http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=18&ID=3117
RedHat RHSA: RHSA-2005:358 RHSA-2005:608 RHSA-2005:816

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