Apache HTTP Server mod_dav denial of service

apache-mod-dav-dos (10208) The risk level is classified as MediumMedium Risk

Description:

Apache HTTP Server is vulnerable to a denial of service attack, caused by a vulnerability in the mod_dav distributed authoring and versioning (DAV) module. A remote attacker using a WebDAV client could send a malformed HTTP request to a vulnerable server to cause the web_dav module to reference a NULL pointer and consume all available CPU resources.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Apache HTTP Server (2.0.42 or later), available from the Apache Web site. See References.

References:

  • Apache HTTP Server Project Web site: Apache HTTPD Project - The Apache HTTPD Server Project.
  • WebDAV Web site: mod_dav: a DAV module for Apache.
  • BID-5816: Apache 2 mod_dav Denial Of Service Vulnerability
  • CVE-2002-1593: mod_dav in Apache before 2.0.42 does not properly handle versioning hooks, which may allow remote attackers to kill a child process via a null dereference and cause a denial of service (CPU consumption) in a preforked multi-processing module.
  • OSVDB ID: 14896: mod_dav for Apache HTTP Server Remote Null Dereference Child Process Termination
  • SECTRACK ID: 1005285: Apache Web Server `mod_dav` Has Null Pointer Bug That May Allow Remote Users to Cause Denial of Service Conditions
  • US-CERT VU#406121: Apache mod_dav module vulnerable to DoS

Platforms Affected:

  • Apache HTTP Server 2.0
  • Apache HTTP Server 2.0.28
  • Apache HTTP Server 2.0.32
  • Apache HTTP Server 2.0.35
  • Apache HTTP Server 2.0.36
  • Apache HTTP Server 2.0.37
  • Apache HTTP Server 2.0.38
  • Apache HTTP Server 2.0.39
  • Apache HTTP Server 2.0.40
  • Apache HTTP Server 2.0.41

Reported:

Sep 25, 2002

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