Rule

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Sid
23779

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Summary:
This event is generated when an attempt is made to exploit a known vulnerability in apr-util.

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Impact:
Denial of Service. Information disclosure. Loss of integrity. 

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Detailed Information:
The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

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Affected Systems:
apache apr-util 0.9.1
apache apr-util 0.9.2
apache apr-util 0.9.3
apache apr-util 0.9.4
apache apr-util 0.9.5
apache apr-util 1.0
apache apr-util 1.0.1
apache apr-util 1.0.2
apache apr-util 1.1.0
apache apr-util 1.1.1
apache apr-util 1.1.2
apache apr-util 1.2.1
apache apr-util 1.2.2
apache apr-util 1.2.6
apache apr-util 1.2.7
apache apr-util 1.2.8
apache apr-util 1.3.0
apache apr-util 1.3.1
apache apr-util 1.3.2
apache apr-util 1.3.3
apache apr-util 1.3.4
apache apr-util 1.3.5
apache apr-util 1.3.6

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Attack Scenarios:
An attacker can host a web site that will return code of their choosing to the object when a victim clicks on a malicious link.

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Ease of Attack:
Medium.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

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Contributors:
Sourcefire Vulnerability Research Team
This document was generated from data supplied by the National Vulnerability Database. A product of the National Institute of Standards and Technology.
For more information see http://nvd.nist.gov/

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Additional References:

NIST CVE-2009-1955:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-1955
  
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