Apache mod_ssl format string attack

apache-modssl-format-string (16705)

High Risk

Description:

The mod_ssl authentication module is vulnerable to a format string attack, caused by a vulnerability in the ssl_log function within the mod_proxy hook functions. A remote attacker could exploit this vulnerability to gain access to the system.

Platforms Affected:

• Canonical, Ubuntu 4.10
• Canonical, Ubuntu 5.04
• Conectiva, Linux 8.0
• Debian, Debian Linux 3.0
• Gentoo, Linux
• HP, HP-UX 11.00
• HP, HP-UX 11.11
• HP, HP-UX 11.20
• HP, HP-UX 11.22
• MandrakeSoft, Mandrake Linux 10.0
• MandrakeSoft, Mandrake Linux 10.0 AMD64
• MandrakeSoft, Mandrake Linux 9.1
• MandrakeSoft, Mandrake Linux 9.1 PPC
• MandrakeSoft, Mandrake Linux 9.2 AMD64
• MandrakeSoft, Mandrake Linux 9.2
• MandrakeSoft, Mandrake Linux Corporate Server 2.1
• MandrakeSoft, Mandrake Linux Corporate Server 2.1 X86_64
• MandrakeSoft, Mandrake Multi Network Firewall 8.2
• OpenPKG, OpenPKG 1.3
• OpenPKG, OpenPKG 2.0
• OpenPKG, OpenPKG 2.1
• OpenPKG, OpenPKG CURRENT
• Ralf S. Engelschall, mod_ssl 2.x
• RedHat, Enterprise Linux 2.1 ES
• RedHat, Enterprise Linux 2.1 WS
• RedHat, Enterprise Linux 2.1 AW
• RedHat, Enterprise Linux 2.1 AS
• RedHat, Linux Advanced Workstation 2.1 Itanium
• RedHat, Network Proxy 4.2
• Slackware, Slackware Linux 10.0
• Slackware, Slackware Linux 8.1
• Slackware, Slackware Linux 9.0
• Slackware, Slackware Linux 9.1
• Slackware, Slackware Linux current
• Turbolinux, Turbolinux 7 Server
• Turbolinux, Turbolinux 8 Server
• Turbolinux, Turbolinux Appliance Server 1.0 Hosting Ed
• Turbolinux, Turbolinux Appliance Server 1.0 Workgroup Ed

Remedy:

Upgrade to the latest version of mod_ssl (2.8.19-1.3.31 or later), available from the mod_ssl Web site. See References.

For OpenPKG:
Upgrade to the latest apache package, as listed in OpenPKG Security Advisory OpenPKG-SA-2004.032. See References.

OpenPKG 2.0: 1.3.29-2.0.4 or later
OpenPKG 2.1: 1.3.31-2.1.1 or later
OpenPKG CURRENT: 1.3.31-20040716 or later
OpenPKG 1.3: 1.3.28-1.3.6 or later

For Gentoo Linux:
Upgrade to the latest version of mod_ssl (2.8.19 or later), as listed in GLSA 200407-18. See References.

For Debian GNU/Linux 3.0 (alias woody):
Upgrade to the latest mod-ssl package (2.8.9-2.3 or later), as listed in DSA-532-1. See References.

For Slackware Linux:
Upgrade to the latest mod-ssl package, as listed below. Refer to slackware-security Mailing List, Sun, 25 Jul 2004 20:24:56 -0700 (PDT) for more information. See References.

Slackware Linux 9.0 and 8.1: 2.8.19_1.3.31-i386-1 or later
Slackware Linux 9.1, 10.0 and -current: 2.8.19_1.3.31-i486-1 or later

For Mandrake Linux:
Upgrade to the latest mod-ssl package, as listed below.Refer to MandrakeSoft Security Advisory MDKSA-2004:075 : mod_ssl for more information.See References.

Mandrake Linux 9.1: 2.8.12-8.2.91mdk or later
Mandrake Linux 9.2: 2.8.15-1.2.92mdk or later
Mandrake Linux Multi Network Firewall 8.2: 2.8.7-3.4.M82mdk or later
Mandrake Linux Corporate Server 2.1: 2.8.10-5.4.C21mdk or later
Mandrake Linux 10.0: 2.8.16-1.2.100mdk or later

For Conectiva Linux:
Upgrade to the latest mod-ssl package, as listed below. Refer to Conectiva Linux Security Announcement CLSA-2004:857 for more information. See References.

Conectiva Linux 8: 1.3.28-1U80_5cl or later

For Red Hat Linux:
Upgrade to the latest mod-ssl package, as listed below. Refer to RHSA-2004:408-05 for more information. See References.

Red Hat Enterprise Linux AS (v. 2.1), ES (v. 2.1), WS (v. 2.1), and Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor: 2.8.12-6 or later

For HP-UX 11.00, 11.11, 11.22, and 11.20:
Apply the appropriate patch for your system, as listed in Hewlett-Packard Company Security Bulletin HPSBUX01098. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

Consequences:

Gain Access

References:

• CIAC Information Bulletin 0-188, libapache-mod-ssl at http://www.ciac.org/ciac/bulletins/o-188.shtml.
• Conectiva Linux Security Announcement CLSA-2004:857, Format string vulnerability with mod_ssl at http://distro.conectiva.com.br/atualizacoes/index.php?id=a&anuncio=000857.
• mod_ssl Web site, mod_ssl: The Apache Interface to OpenSSL at http://www.modssl.org/.
• Slackware-Security Mailing List, Sun, 25 Jul 2004 20:24:56 -0700 (PDT), new mod_ssl packages at http://slackware.com/security/viewer.php?l=slackware-security&y=2004&m=slackware-security.419544.
• BID-10736: Apache 'mod_ssl' Log Function Format String Vulnerability
• CVE-2004-0700: Format string vulnerability in the mod_proxy hook functions function in ssl_engine_log.c in mod_ssl before 2.8.19 for Apache before 1.3.31 may allow remote attackers to execute arbitrary messages via format string specifiers in certain log messages for HTTPS that are handled by the ssl_log function.
• DSA-532: libapache-mod-ssl -- several vulnerabilities
• GLSA-200407-18: mod_ssl: Format string vulnerability
• MDKSA-2004:075: Updated mod_ssl packages fix potential vulnerabilities
• OpenPKG-SA-2004.032: Apache mod_ssl
• OSVDB ID: 7929: Apache HTTP Server mod_ssl ssl_log Function Format String
• RHSA-2004-408: mod_ssl security update
• RHSA-2008-0523: Low: Red Hat Network Proxy Server security update

Reported:

Jul 16, 2004

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email xforce@iss.net

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