Apache mod_proxy_balancer balancer_handler function denial of service
| apache-modproxybalancer-dos (39476) |  Low Risk |
Description:
Apache is vulnerable to a denial of service, caused by an error in the mod_proxy_balancer module balancer_handler function when using a threaded Multi-Processing Module. By sending a specially-crafted request to the bb variable during the editing of worker settings, a remote authenticated attacker could crash the child process handling the request.
Platforms Affected:
- Apache, HTTP Server 2.2
- Apache, HTTP Server 2.2.1
- Apache, HTTP Server 2.2.2
- Apache, HTTP Server 2.2.3
- Apache, HTTP Server 2.2.4
- Apache, HTTP Server 2.2.5 Dev
- Apache, HTTP Server 2.2.6
- Canonical, Ubuntu 6.06 LTS
- Canonical, Ubuntu 6.10
- Canonical, Ubuntu 7.04
- Canonical, Ubuntu 7.10
- Gentoo, Linux
- MandrakeSoft, Mandrake Linux 2007
- MandrakeSoft, Mandrake Linux 2007 X86_64
- MandrakeSoft, Mandrake Linux 2007.1
- MandrakeSoft, Mandrake Linux 2007.1 X86_64
- MandrakeSoft, Mandrake Linux 2008.0
- MandrakeSoft, Mandrake Linux 2008.0 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 4.0 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 4.0
- Novell, Linux Desktop 9
- Novell, Linux Desktop 9 SDK
- Novell, Linux POS 9
- Novell, Open Enterprise Server
- Novell, Open Enterprise Server
- Novell, OpenSUSE 10.2
- Novell, OpenSUSE 10.3
- Novell, SLE SDK 10 SP1
- Novell, SUSE Linux Enterprise Desktop 10 SP1
- Novell, SUSE Linux Enterprise Server 10 SP1
- Novell, SUSE Linux Enterprise Server 10
- RedHat, Enterprise Linux 5 Client Workstation
- RedHat, Enterprise Linux 5 Client
- RedHat, Enterprise Linux 5
- RedHat, RHEL Application Stack 2
- SuSE, SLE SDK 10
- SuSE, SuSE SLES 9
- Turbolinux, Turbolinux 10 Server
- Turbolinux, Turbolinux 10 Server x64 Ed
- Turbolinux, Turbolinux 11 Server
- Turbolinux, Turbolinux 11 Server x64 Ed
- Turbolinux, Turbolinux FUJI
- Turbolinux, Turbolinux Multimedia
- Turbolinux, Turbolinux Personal
- Turbolinux, Turbolinux Appliance Server 1.0 Hosting Ed
- Turbolinux, Turbolinux Appliance Server 1.0 Workgroup Ed
- Turbolinux, Turbolinux Appliance Server 2.0
Remedy:
Upgrade to the latest version of Apache (2.2.7-dev or later), available from the Apache Web site. See References.
Consequences:
Denial of Service
References:
- Apache Web site, Fixed in Apache httpd 2.2.7-dev - low: mod_proxy_balancer DoS CVE-2007-6422 at http://httpd.apache.org/security/vulnerabilities_22.html.
- SecurityReason Advisory: SecurityAlert : 48, Apache2 CSRF, XSS, Memory Corruption and Denial of Service Vulnerability at http://securityreason.com/achievement_securityalert/48.
- ASA-2008-027: httpd security update (RHSA-2008-0007)
- BID-27236: Apache 'mod_proxy_balancer' Multiple Vulnerabilities
- CVE-2007-6422: The balancer_handler function in mod_proxy_balancer in the Apache HTTP Server 2.2.0 through 2.2.6, when a threaded Multi-Processing Module is used, allows remote authenticated users to cause a denial of service (child process crash) via an invalid bb variable.
- GLSA-200803-19: Apache: Multiple vulnerabilities
- MDVSA-2008:016: Updated apache 2.2.x packages fix multiple vulnerabilities
- RHSA-2008-0008: Moderate: httpd security update
- RHSA-2008-0009: Moderate: httpd security update
- SUSE-SA:2008:021: Apache security problems
Reported:
Jan 04, 2008
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