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Last updated: 5/29/2016 1:39:49 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2009-1955

Original release date: 06/07/2009
Last revised: 10/10/2013


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.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 7.8 HIGH
Impact Subscore: 6.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: FEDORA
Name: FEDORA-2009-6261
External Source: MLIST
Name: [apr-dev] 20090602 [PATCH] prevent "billion laughs" attack against expat
Type: Patch Information
External Source: FEDORA
Name: FEDORA-2009-5969
External Source: UBUNTU
Name: USN-787-1
External Source: AIXAPAR
Name: PK99478
External Source: MANDRIVA
Name: MDVSA-2009:131
External Source: CONFIRM
Name: http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
Type: Patch Information
External Source: CONFIRM
Name: http://support.apple.com/kb/HT3937
External Source: SLACKWARE
Name: SSA:2009-167-02
External Source: UBUNTU
Name: USN-786-1
External Source: MILW0RM
Name: 8842
External Source: REDHAT
Name: RHSA-2009:1108
External Source: DEBIAN
Name: DSA-1812
Type: Patch Information
External Source: AIXAPAR
Name: PK88342
External Source: OVAL
Name: oval:org.mitre.oval:def:10270
External Source: CONFIRM
Name: http://svn.apache.org/viewvc?view=rev&revision=781403
External Source: APPLE
Name: APPLE-SA-2009-11-09-1
External Source: CONFIRM
Name: http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
External Source: VUPEN
Name: ADV-2009-1907
External Source: FEDORA
Name: FEDORA-2009-6014
External Source: SUSE
Name: SUSE-SR:2010:011
External Source: OVAL
Name: oval:org.mitre.oval:def:12473
External Source: BUGTRAQ
Name: 20090824 rPSA-2009-0123-1 apr-util
External Source: VUPEN
Name: ADV-2010-1107
External Source: CONFIRM
Name: http://www-01.ibm.com/support/docview.wss?uid=swg27014463
External Source: GENTOO
Name: GLSA-200907-03
External Source: HP
Name: HPSBUX02612
External Source: MLIST
Name: [oss-security] 20090603 CVE request: "billion laughs" attack against Apache APR
External Source: MANDRIVA
Name: MDVSA-2013:150
External Source: AIXAPAR
Name: PK91241
External Source: REDHAT
Name: RHSA-2009:1107
External Source: BID
Name: 35253
External Source: CONFIRM
Name: http://wiki.rpath.com/Advisories:rPSA-2009-0123
External Source: VUPEN
Name: ADV-2009-3184
Type: Advisory

References to Check Content

Identifier: oval:org.mitre.oval:def:10270
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:12473
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Technical Details

Vulnerability Type (View All)
  • Resource Management Errors (CWE-399)