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Vulnerability Details : CVE-2009-1955

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.
Publish Date : 2009-06-07 Last Update Date : 2018-10-10
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 399

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate
AV:N/AC:L/Au:N/C:N/I:N/A:P 2009-06-01 2009-06-01
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- Related OVAL Definitions

Title Definition Id Class Family
APR-util XML DoS oval:org.apache.httpd:def:20091955
CVE-2009-1955 unix
ELSA-2009:1107: apr-util security update (Moderate) oval:org.mitre.oval:def:22801 unix
HP-UX Apache-based Web Server, Local Information Disclosure, Increase of Privilege, Remote Denial of Service (DoS) oval:org.mitre.oval:def:12473 unix
RHSA-2009:1107 -- apr-util security update (Moderate) oval:org.mitre.oval:def:29299 unix
RHSA-2009:1107: apr-util security update (Moderate) oval:com.redhat.rhsa:def:20091107 unix
RHSA-2009:1108: httpd security update (Moderate) oval:com.redhat.rhsa:def:20091108 unix
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... oval:org.mitre.oval:def:10270 unix
USN-786-1 -- apr-util vulnerabilities oval:org.mitre.oval:def:13719 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2009-1955

# Product Type Vendor Product Version Update Edition Language
1 Application Apache Apr-util 0.9.1 Version Details Vulnerabilities
2 Application Apache Apr-util 0.9.2 Version Details Vulnerabilities
3 Application Apache Apr-util 0.9.3 Version Details Vulnerabilities
4 Application Apache Apr-util 0.9.4 Version Details Vulnerabilities
5 Application Apache Apr-util 0.9.5 Version Details Vulnerabilities
6 Application Apache Apr-util 1.0 Version Details Vulnerabilities
7 Application Apache Apr-util 1.0.1 Version Details Vulnerabilities
8 Application Apache Apr-util 1.0.2 Version Details Vulnerabilities
9 Application Apache Apr-util 1.1.0 Version Details Vulnerabilities
10 Application Apache Apr-util 1.1.1 Version Details Vulnerabilities
11 Application Apache Apr-util 1.1.2 Version Details Vulnerabilities
12 Application Apache Apr-util 1.2.1 Version Details Vulnerabilities
13 Application Apache Apr-util 1.2.2 Version Details Vulnerabilities
14 Application Apache Apr-util 1.2.6 Version Details Vulnerabilities
15 Application Apache Apr-util 1.2.7 Version Details Vulnerabilities
16 Application Apache Apr-util 1.2.8 Version Details Vulnerabilities
17 Application Apache Apr-util 1.3.0 Version Details Vulnerabilities
18 Application Apache Apr-util 1.3.1 Version Details Vulnerabilities
19 Application Apache Apr-util 1.3.2 Version Details Vulnerabilities
20 Application Apache Apr-util 1.3.3 Version Details Vulnerabilities
21 Application Apache Apr-util 1.3.4 Version Details Vulnerabilities
22 Application Apache Apr-util 1.3.5 Version Details Vulnerabilities
23 Application Apache Apr-util 1.3.6 Version Details Vulnerabilities
24 Application Apache Http Server Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Apache Apr-util 23
Apache Http Server 1

- References For CVE-2009-1955
MLIST [oss-security] 20090603 CVE request: "billion laughs" attack against Apache APR CONFIRM
REDHAT RHSA-2009:1107
REDHAT RHSA-2009:1108
BUGTRAQ 20090824 rPSA-2009-0123-1 apr-util
BID 35253 Apache APR-util 'xml/apr_xml.c' Denial of Service Vulnerability Release Date:2013-04-16
VUPEN ADV-2009-1907
VUPEN ADV-2009-3184
VUPEN ADV-2010-1107
SUSE SUSE-SR:2010:011
GENTOO GLSA-200907-03
APPLE APPLE-SA-2009-11-09-1
MLIST [apr-dev] 20090602 [PATCH] prevent "billion laughs" attack against expat

- Metasploit Modules Related To CVE-2009-1955

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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