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CVE-2009-0781: Apache Tomcat cross-site scripting vulnerability

Severity: low

Vendor:
The Apache Software Foundation

Versions Affected:
Tomcat 6.0.0 to 6.0.18
Tomcat 5.5.0 to 5.5.27
Tomcat 4.1.0 to 4.1.39

Description:
The calendar application in the examples contains invalid HTML which
renders the XSS protection for the time parameter ineffective. An
attacker can therefore perform an XSS attack using the time attribute.

Mitigation:
6.0.x users should do one of the following:
 - remove the examples web application
 - apply this patch http://svn.apache.org/viewvc?rev=750924&view=rev
 - upgrade to 6.0.19 when released
5.5.x users should do one of the following:
 - remove the examples web application
 - apply this patch http://svn.apache.org/viewvc?rev=750928&view=rev
 - upgrade to 5.5.28 when released
4.1.x users should do one of the following:
 - remove the examples web application
 - apply this patch http://svn.apache.org/viewvc?rev=750927&view=rev
 - upgrade to 4.1.40 when released

Example:
http://localhost:8080/examples/jsp/cal/cal2.jsp?time=8am%20STYLE=xss:e/**/xpression(try{a=firstTime}catch(e){firstTime=1;alert('XSS')});

Credit:
This issue was discovered by Deniz Cevik.

References:
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-5.html
http://tomcat.apache.org/security-4.html

The Apache Tomcat Security Team
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