Apache HTTP Server mod_fcgid module denial of service

apache-modfcgid-dos (74181) The risk level is classified as MediumMedium Risk

Description:

Apache HTTP Server could allow a remote attacker to cause a denial of service, caused by a failure to recognize the FcgidMaxProcessesPerClass directive for a virtual host in the mod_fcgid module. By sending a series of HTTP requests, a remote attacker could exploit this vulnerability to cause the consumption of CPU resources.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of mod_fcgid FastCGI module for Apache HTTP Server (2.3.6 or later), available from the Apache Web site. See References.

References:

  • Apache Web site: Apache mod_fcgid FastCGI module for Apache HTTP Server released as 2.3.6.
  • Red Hat Bugzilla Bug 803918 : CVE-2012-1181 mod_fcgid 2.3.6 does not respect configured FcgidMaxProcessesPerClass in VirtualHost.
  • BID-52565: Apache 'mod_fcgid' Module Denial Of Service Vulnerability
  • CVE-2012-1181: fcgid_spawn_ctl.c in the mod_fcgid module 2.3.6 for the Apache HTTP Server does not recognize the FcgidMaxProcessesPerClass directive for a virtual host, which makes it easier for remote attackers to cause a denial of service (memory consumption) via a series of HTTP requests that triggers a process count higher than the intended limit.
  • DSA-2436: libapache2-mod-fcgid -- inactive resource limits
  • OSVDB ID: 80349: Apache HTTP Server mod_fcgid Module fcgid_spawn_ctl.c FcgidMaxProcessesPerClass Virtual Host Directive HTTP Request Parsing Remote DoS

Platforms Affected:

  • Apache HTTP Server 2.3.6

Reported:

Mar 16, 2012

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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 IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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