National Cyber-Alert System
Vulnerability Summary for CVE-2009-1955
Original release date:06/08/2009
Last revised:08/12/2009
Source:
US-CERT/NIST
Overview
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.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
2.9
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 serviceUnknown
References to Advisories, Solutions, and Tools
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External Source: DEBIAN
Name: DSA-1812
Type: Patch Information
External Source: CONFIRM
Name: http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
Type: Patch Information
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: FEDORA
Name: FEDORA-2009-6261
External Source: FEDORA
Name: FEDORA-2009-6014
External Source: VUPEN
Name: ADV-2009-1907
External Source: UBUNTU
Name: USN-787-1
External Source: UBUNTU
Name: USN-786-1
External Source: BID
Name: 35253
External Source: REDHAT
Name: RHSA-2009:1108
External Source: REDHAT
Name: RHSA-2009:1107
External Source: MLIST
Name: [oss-security] 20090603 CVE request: "billion laughs" attack against Apache APR
External Source: MILW0RM
Name: 8842
External Source: MANDRIVA
Name: MDVSA-2009:131
External Source: AIXAPAR
Name: PK91241
External Source: AIXAPAR
Name: PK88342
External Source: CONFIRM
Name: http://svn.apache.org/viewvc?view=rev&revision=781403
External Source: SLACKWARE
Name: SSA:2009-167-02
External Source: GENTOO
Name: GLSA-200907-03
External Source: SECUNIA
Name: 35843
External Source: SECUNIA
Name: 35797
External Source: SECUNIA
Name: 35710
External Source: SECUNIA
Name: 35565
External Source: SECUNIA
Name: 35487
External Source: SECUNIA
Name: 35444
External Source: SECUNIA
Name: 35395
External Source: SECUNIA
Name: 35360
Type: Advisory
External Source: SECUNIA
Name: 35284
Type: Advisory
External Source: SECUNIA
Name: 34724