GLSA-200509-12 : Apache, mod_ssl: Multiple vulnerabilities

Critical Nessus Plugin ID 19811

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 5.9


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-200509-12 (Apache, mod_ssl: Multiple vulnerabilities)

mod_ssl contains a security issue when 'SSLVerifyClient optional' is configured in the global virtual host configuration (CAN-2005-2700).
Also, Apache's httpd includes a PCRE library, which makes it vulnerable to an integer overflow (CAN-2005-2491).
Impact :

Under a specific configuration, mod_ssl does not properly enforce the client-based certificate authentication directive, 'SSLVerifyClient require', in a per-location context, which could be potentially used by a remote attacker to bypass some restrictions. By creating a specially crafted '.htaccess' file, a local attacker could possibly exploit Apache's vulnerability, which would result in a local privilege escalation.
Workaround :

There is no known workaround at this time.


All mod_ssl users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-www/mod_ssl-2.8.24' All Apache 2 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=www-servers/apache-2.0.54-r15'

See Also

Plugin Details

Severity: Critical

ID: 19811

File Name: gentoo_GLSA-200509-12.nasl

Version: 1.19

Type: local

Published: 2005/10/05

Updated: 2021/01/06

Dependencies: 12634

Risk Information

Risk Factor: Critical

VPR Score: 5.9

CVSS v2.0

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:apache, p-cpe:/a:gentoo:linux:mod_ssl, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2005/09/19

Vulnerability Publication Date: 2005/08/20

Reference Information

CVE: CVE-2005-2491, CVE-2005-2700

BID: 14620

GLSA: 200509-12