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Vulnerability Details : CVE-2009-3720

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.
Publish Date : 2009-11-03 Last Update Date : 2011-09-28
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
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 Partial (There is reduced performance or interruptions in resource availability.)
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 CWE id is not defined for this vulnerability

- Vendor Statements

Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-3720 The Red Hat Security Response Team has rated this issue as having moderate security impact in Python, a future update may address this flaw. If a system has PyXML installed, Python will use PyXML for expat-related functions and is then not vulnerable to the issue.
Source: Redhat

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P 2009-08-21 2009-01-17
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- Related OVAL Definitions

Title Definition Id Class Family
CVE-2009-3720 oval:org.opensuse.security:def:20093720 unix
DSA-1977 python2.4 python2.5 -- several vulnerabilities oval:org.mitre.oval:def:7152 unix
DSA-1977-1 python - several vulnerabilities oval:org.mitre.oval:def:18064 unix
ELSA-2009:1625: expat security update (Moderate) oval:org.mitre.oval:def:22880 unix
ELSA-2010:0002: PyXML security update (Moderate) oval:org.mitre.oval:def:23002 unix
ELSA-2011:0492: python security update (Moderate) oval:org.mitre.oval:def:23229 unix
expat DoS oval:org.apache.httpd:def:20093720
Expat UTF-8 Character XML Parsing Remote Denial of Service Vulnerability oval:org.mitre.oval:def:7112 unix
HP-UX Apache Web Server, Remote Information Disclosure, Cross-Site Scripting (XSS), Denial of Service (DoS) oval:org.mitre.oval:def:12719 unix
RHSA-2009:1572: 4Suite security update (Moderate) oval:com.redhat.rhsa:def:20091572 unix
RHSA-2009:1625: expat security update (Moderate) oval:com.redhat.rhsa:def:20091625 unix
RHSA-2010:0002: PyXML security update (Moderate) oval:com.redhat.rhsa:def:20100002 unix
RHSA-2010:0002: PyXML security update (Moderate) oval:org.mitre.oval:def:21948 unix
RHSA-2011:0491: python security update (Moderate) oval:com.redhat.rhsa:def:20110491 unix
RHSA-2011:0492: python security update (Moderate) oval:org.mitre.oval:def:21923 unix
RHSA-2011:0492: python security update (Moderate) oval:com.redhat.rhsa:def:20110492 unix
The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and o... oval:org.mitre.oval:def:11019 unix
VMware ESXi and ESX updates to third party library and ESX Service Console oval:org.mitre.oval:def:20637 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-2009-3720

# Product Type Vendor Product Version Update Edition Language
1 Application James Clark Expat 2.0.1 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
James Clark Expat 1

- References For CVE-2009-3720

http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?view=log CONFIRM
http://www.mandriva.com/security/advisories?name=MDVSA-2009:212
MANDRIVA MDVSA-2009:212
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051367.html
FEDORA FEDORA-2010-17720
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051405.html
FEDORA FEDORA-2010-17819
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
SUSE SUSE-SR:2010:011
http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
SUSE SUSE-SR:2009:018
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051442.html
FEDORA FEDORA-2010-17807
http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
SUSE SUSE-SR:2010:014
http://lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html
SUSE SUSE-SR:2010:013
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00002.html
SUSE SUSE-SR:2010:012
http://mail.python.org/pipermail/expat-bugs/2009-January/002781.html
MLIST [expat-bugs] 20090117 [ expat-Bugs-1990430 ] Parser crash with specially formatted UTF-8 sequences
http://lists.vmware.com/pipermail/security-announce/2010/000082.html
MLIST [security-announce] 20100303 VMSA-2010-0004 ESX Service Console and vMA third party updates
http://secunia.com/advisories/38050
SECUNIA 38050
http://secunia.com/advisories/37925
SECUNIA 37925
http://secunia.com/advisories/37537
SECUNIA 37537
http://secunia.com/advisories/37324
SECUNIA 37324
http://secunia.com/advisories/38834
SECUNIA 38834
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051228.html
FEDORA FEDORA-2010-17762
http://secunia.com/advisories/38231
SECUNIA 38231
http://secunia.com/advisories/38832
SECUNIA 38832
http://secunia.com/advisories/38794
SECUNIA 38794
http://secunia.com/advisories/41701
SECUNIA 41701
http://secunia.com/advisories/39478
SECUNIA 39478
http://secunia.com/advisories/42326
SECUNIA 42326
http://secunia.com/advisories/42338
SECUNIA 42338
http://secunia.com/advisories/43300
SECUNIA 43300
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.486026
SLACKWARE SSA:2011-041-02
http://www.openwall.com/lists/oss-security/2009/08/21/2
MLIST [oss-security] 20090821 expat bug 1990430
http://sourceforge.net/tracker/index.php?func=detail&aid=1990430&group_id=10127&atid=110127
http://sunsolve.sun.com/search/document.do?assetkey=1-66-273630-1
SUNALERT 273630
http://svn.python.org/view?view=rev&revision=74429 CONFIRM
http://www.mandriva.com/security/advisories?name=MDVSA-2009:211
MANDRIVA MDVSA-2009:211
http://www.mandriva.com/security/advisories?name=MDVSA-2009:215
MANDRIVA MDVSA-2009:215
http://www.mandriva.com/security/advisories?name=MDVSA-2009:216
MANDRIVA MDVSA-2009:216
http://www.mandriva.com/security/advisories?name=MDVSA-2009:218
MANDRIVA MDVSA-2009:218
http://www.redhat.com/support/errata/RHSA-2011-0896.html
REDHAT RHSA-2011:0896
http://www.redhat.com/support/errata/RHSA-2010-0002.html
REDHAT RHSA-2010:0002
http://www.openwall.com/lists/oss-security/2009/10/28/3
MLIST [oss-security] 20091028 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430]
http://www.openwall.com/lists/oss-security/2009/10/26/3
MLIST [oss-security] 20091026 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430]
http://www.openwall.com/lists/oss-security/2009/10/23/6
MLIST [oss-security] 20091023 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430]
http://www.openwall.com/lists/oss-security/2009/10/23/2
MLIST [oss-security] 20091022 Re: Re: Regarding expat bug 1990430
http://www.openwall.com/lists/oss-security/2009/08/27/6
MLIST [oss-security] 20090827 Re: Re: expat bug 1990430
http://www.mandriva.com/security/advisories?name=MDVSA-2009:219
MANDRIVA MDVSA-2009:219
http://www.openwall.com/lists/oss-security/2009/09/06/1
MLIST [oss-security] 20090906 Re: Re: expat bug 1990430
http://www.mandriva.com/security/advisories?name=MDVSA-2009:220
MANDRIVA MDVSA-2009:220
http://www.openwall.com/lists/oss-security/2009/08/26/3
MLIST [oss-security] 20090826 Re: expat bug 1990430
http://www.openwall.com/lists/oss-security/2009/08/26/4
MLIST [oss-security] 20090826 Re: Re: expat bug 1990430
http://www.mandriva.com/security/advisories?name=MDVSA-2009:217
MANDRIVA MDVSA-2009:217
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg01274.html
FEDORA FEDORA-2009-12753
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00413.html
FEDORA FEDORA-2009-12737
http://www.openwall.com/lists/oss-security/2009/10/22/5
MLIST [oss-security] 20091022 Regarding expat bug 1990430
http://www.openwall.com/lists/oss-security/2009/10/22/9
MLIST [oss-security] 20091022 Re: Regarding expat bug 1990430
http://www.ubuntu.com/usn/USN-890-6
UBUNTU USN-890-6
http://www.securitytracker.com/id?1023160
SECTRACK 1023160
http://www.ubuntu.com/usn/USN-890-1
UBUNTU USN-890-1
http://www.vupen.com/english/advisories/2010/0528
VUPEN ADV-2010-0528
http://www.vupen.com/english/advisories/2010/0896
VUPEN ADV-2010-0896
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051247.html
FEDORA FEDORA-2010-17732
http://www.vupen.com/english/advisories/2010/1107
VUPEN ADV-2010-1107
http://www.vupen.com/english/advisories/2010/3035
VUPEN ADV-2010-3035
http://www.vupen.com/english/advisories/2010/3053
VUPEN ADV-2010-3053
http://www.vupen.com/english/advisories/2011/0359
VUPEN ADV-2011-0359
http://www.vupen.com/english/advisories/2010/3061
VUPEN ADV-2010-3061
https://bugs.gentoo.org/show_bug.cgi?id=280615 CONFIRM
https://bugzilla.redhat.com/show_bug.cgi?id=531697 CONFIRM
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00370.html
FEDORA FEDORA-2009-12690
http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?r1=1.13&r2=1.15&view=patch CONFIRM

- Vulnerability Conditions

Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)

- Metasploit Modules Related To CVE-2009-3720

There are not any metasploit modules related to this vulnerability (Please visit www.metasploit.com for more information)


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