CVE-2009-1955

Publication date 8 June 2009

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	9.04 jaunty	Not affected
	8.10 intrepid	Not affected
	8.04 LTS hardy	Not affected
	6.06 LTS dapper	Fixed 2.0.55-4ubuntu2.5
apr-util	9.04 jaunty	Fixed 1.2.12+dfsg-8ubuntu0.1
	8.10 intrepid	Fixed 1.2.12+dfsg-7ubuntu0.1
	8.04 LTS hardy	Fixed 1.2.12+dfsg-3ubuntu0.1
	6.06 LTS dapper	Not in release

Notes

mdeslaur

PoC: http://www.milw0rm.com/exploits/8842

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apr-util	Upstream: http://svn.apache.org/viewvc?view=rev&revision=781415

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H