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AUSCERT External Security Bulletin Redistribution
ESB-2009.1141
A number of vulnerabilities have been identified in XML libraries as used
by Python libexpat, Apache Xerces and Sun Java
7 August 2009
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AusCERT Security Bulletin Summary
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Product: Python libexpat
Apache Xerces - all versions
Sun JDK and JRE 6 Update 14 and earlier
Sun JDK and JRE 5.0 Update 19 and earlier
Publisher: CERT-FI
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2009-1885 CVE-2009-2625
Reference: ESB-2009.1132.2
Original Bulletin:
https://www.cert.fi/en/reports/2009/vulnerability2009085.html
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CERT-FI Advisory on XML libraries
Target
- - servers and server applications
- - workstations and end user applications
- - network devices
- - embedded systems
- - mobile devices
- - other
Access Vector
- - remote
Impact
- - potential code execution
- - denial of service
Remediation
- - fix provided by vendor
- - no fix availble
Details
Several vulnerabilities regarding the parsing of XML data have been found in
XML library implementations. CERT-FI coordinated the remediation efforts of
these vulnerabilities.
The vulnerabilities are related to the parsing of XML elements with unexpected
byte values and recursive parentheses, which cause the program to access memory
out of bounds, or to loop indefinitely. The effects of the vulnerabilities
include denial of service and potentially code execution. The vulnerabilities
can be exploited by enticing a user to open a specially modified file, or by
submitting it to a server that handles XML content.
Vulnerability Coordination Information and Acknowledgements
CERT-FI has coordinated the release of this vulnerability between the
vulnerability researcher and the affected vendors. CERT-FI would like to thank
Jukka Taimisto, Tero Rontti and Rauli Kaksonen from the CROSS project at
Codenomicon Ltd for reporting the vulnerability to us, and the vendors for
co-operation in the remediation efforts.
Vendor Information
* Python libexpat
* Apache Xerces, all versions
* Sun JDK and JRE 6 Update 14 and earlier
* Sun JDK and JRE 5.0 Update 19 and earlier
Vendor Statements
Python
We are working on a fix.
Remediation
Patch the vulnerable software components according to the guidance published by
the vendor. Where available, refer to the 'Vendor Information' section of this
advisory for platform specific remediation.
References
* http://sunsolve.sun.com/search/document.do?assetkey=1-66-263489-1
* http://svn.apache.org/viewvc?view=rev&revision=781488
* http://www.codenomicon.com/labs/xml/
* http://www.codenomicon.com/labs/cross/
* CVE-2009-1885
* CVE-2009-2625
Contact Information
CERT-FI Vulnerability Coordination can be contacted as follows:
Email:
vulncoord@ficora.fi
Please quote the advisory reference [FICORA #245608] in the subject line
Telephone:
+358 9 6966 510
Monday - Friday 08:00 - 16:15 (EET: UTC+2)
Fax :
+358 9 6966 515
Post:
Vulnerability Coordination
FICORA/CERT-FI
P.O. Box 313
FI-00181 Helsinki
FINLAND
CERT-FI encourages those who wish to communicate via email to make use of our
PGP key. The key is available at
https://www.cert.fi/en/activities/contact/pgp-keys.html
Revision History:
6 August 2009, 00:10 a.m.: Published
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