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Last updated: 12/26/2014 2:56:51 AM

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Vulnerability Summary for CVE-2009-2473

Original release date: 08/21/2009
Last revised: 02/06/2013


neon before 0.28.6, when expat is used, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.3 (MEDIUM) (AV:N/AC:M/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (09/22/2009)
Updated neon packages for Red Hat Enterprise Linux 4 and 5 were released via: https://rhn.redhat.com/errata/RHSA-2009-1452.html Embedded copy of the neon library is included in the versions of gnome-vfs2 packages as shipped with Red Hat Enteprise Linux 4 and Red Hat Enteprise Linux 5. The Red Hat Security Response Team has rated this issue as having low security impact on gnome-vfs2, future updates may address this flaw.

References to Advisories, Solutions, and Tools

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External Source: MLIST
Name: [neon] 20090818 neon: release 0.28.6 (SECURITY)
External Source: OVAL
Name: oval:org.mitre.oval:def:9461
External Source: FEDORA
Name: FEDORA-2009-8794
External Source: REDHAT
Name: RHSA-2013:0131
External Source: VUPEN
Name: ADV-2009-2341
Type: Advisory; Patch Information
External Source: SUSE
Name: SUSE-SR:2009:018
External Source: MANDRIVA
Name: MDVSA-2009:221
External Source: APPLE
Name: APPLE-SA-2010-11-10-1
External Source: SECUNIA
Name: 36371
Type: Advisory
External Source: MLIST
Name: [neon] 20090818 CVE-2009-2473: fix for "billion laughs" attack against expat
External Source: XF
Name: neon-xml-dos(52633)
External Source: CONFIRM
Name: http://support.apple.com/kb/HT4435
External Source: FEDORA
Name: FEDORA-2009-8815

References to Check Content

Identifier: oval:org.mitre.oval:def:9461
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Vulnerable software and versions

+ Configuration 1
+ OR
* cpe:/a:webdav:neon:0.28.6

* Denotes Vulnerable Software
Changes related to vulnerability configurations

Technical Details

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