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CVE-2009-2901: Apache Tomcat insecure partial deploy after failed undeploy

Severity: Low

Vendor:
The Apache Software Foundation

Versions Affected:
Tomcat 5.5.0 to 5.5.28
Tomcat 6.0.0 to 6.0.20
The unsupported Tomcat 3.x, 4.x and 5.0.x versions may be also
affected.

Description:
By default, Tomcat automatically deploys any directories placed in a
host's appBase. This behaviour is controlled by the autoDeploy attribute
of a host which defaults to true. After a failed undeploy, the remaining
files will be deployed as a result of the autodeployment process.
Depending on circumstances, files normally protected by one or more
security constraints may be deployed without those security constraints,
making them accessible without authentication.

Mitigation:
6.0.x users should upgrade to 6.0.24 or apply this patch:
http://svn.apache.org/viewvc?rev=892815&view=rev 
5.5.x users should upgrade to 5.5.29 when released or apply this patch:
http://svn.apache.org/viewvc?rev=902650&view=rev 
Note: the patches also address CVE-2009-2693 and CVE-2009-2902.
Alternatively, users of all Tomcat versions may mitigate this issue by
manually ensuring that an undeploy removes all files. If one or more
files cannot be deleted, it may be necessary to stop Tomcat before the
files can be deleted.

Credit:
This issue was discovered by the Apache Tomcat security team

References:
[1] http://tomcat.apache.org/security.html 

Mark Thomas


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