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Last updated: Mon Nov 23 09:46:19 EST 2009

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National Cyber-Alert System

Vulnerability Summary for CVE-2009-3720

Original release date:11/03/2009
Last revised:11/12/2009
Source: US-CERT/NIST

Overview

The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score:5.0 (MEDIUM) (AV:N/AC:L/Au:N/C:N/I:N/A:P) (legend)
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

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External Source: CONFIRM
Name: https://bugs.gentoo.org/show_bug.cgi?id=280615
External Source: MLIST
Name: [oss-security] 20091028 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430]
External Source: MLIST
Name: [oss-security] 20091026 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430]
External Source: MLIST
Name: [oss-security] 20091023 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430]
External Source: MLIST
Name: [oss-security] 20091022 Re: Re: Regarding expat bug 1990430
External Source: MLIST
Name: [oss-security] 20091022 Re: Regarding expat bug 1990430
External Source: MLIST
Name: [oss-security] 20091022 Regarding expat bug 1990430
External Source: MLIST
Name: [oss-security] 20090906 Re: Re: expat bug 1990430
External Source: MLIST
Name: [oss-security] 20090827 Re: Re: expat bug 1990430
External Source: MLIST
Name: [oss-security] 20090826 Re: Re: expat bug 1990430
External Source: MLIST
Name: [oss-security] 20090826 Re: expat bug 1990430
External Source: MLIST
Name: [oss-security] 20090821 expat bug 1990430
External Source: MANDRIVA
Name: MDVSA-2009:211
External Source: CONFIRM
Name: http://svn.python.org/view?view=rev&revision=74429
External Source: MISC
Name: http://sourceforge.net/tracker/index.php?func=detail&aid=1990430&group_id=10127&atid=110127
External Source: MLIST
Name: [expat-bugs] 20090117 [ expat-Bugs-1990430 ] Parser crash with specially formatted UTF-8 sequences
External Source: CONFIRM
Name: http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?view=log
External Source: CONFIRM
Name: http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?r1=1.13&r2=1.15&view=patch

Vulnerable software and versions

Nav control imageConfiguration 1
spacerNav control imageAND
spacerspacerNav control imageOR
spacerspacerline trunkNav control image* cpe:/a:james_clark:expat:2.0.1
spacerspacerNav control imageOR
spacerspacerspacerNav control imagecpe:/a:a_m_kuchling:pyxml
spacerspacerspacerNav control imagecpe:/a:python:python
* Denotes Vulnerable Software

Technical Details

Vulnerability Type (View All)