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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
        ---------------------------------

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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