Apache mod_proxy_balancer balancer_handler function denial of service

apache-modproxybalancer-dos (39476) The risk level is classified as MediumMedium 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.

*CVSS:

Base Score: 4
  Access Vector: Network
  Access Complexity: Low
  Authentication: Single
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Apache (2.2.7-dev or later), available from the Apache Web site. See References.

For other distributions: Apply the appropriate update for your system.

References:

  • Apache Web site: Fixed in Apache httpd 2.2.7-dev - low: mod_proxy_balancer DoS CVE-2007-6422.
  • HP Security Bulletin HPSBMA02442 SSRT090108: HP Business Availability Center Running Apache, Remote Cross Site Scripting (XSS), Cross Site Request Forgery (CSRF), Denial of Service (DoS).
  • SecurityReason Advisory: SecurityAlert : 48: Apache2 CSRF, XSS, Memory Corruption and Denial of Service Vulnerability.
  • 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
  • SA39944: HP Business Availability Center Multiple Vulnerabilities
  • SUSE-SA:2008:021: Apache security problems

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
  • HP Business Availability Center 8.01
  • 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
  • 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 Enterprise Linux 5.1.z EUS
  • RedHat RHEL Application Stack 2
  • 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

Reported:

Jan 04, 2008

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