Apache Tomcat JK ISAPI Connector: Unauthorised Access -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0726
             Path traversal fixed in Tomcat JK ISAPI Connector
                               13 March 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Apache Tomcat JK ISAPI Connector
Publisher:         Apache
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1323  

Original Bulletin: 
   http://tomcat.apache.org/security-jk.html#Fixed_in_Apache_Tomcat_JK_Connector_1.2.43

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CVE-2018-1323 Apache Tomcat JK ISAPI Connector path traversal

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- - Apache Tomcat JK ISAPI Connector 1.2.0 to 1.2.42

Description
The IIS/ISAPI specific code that normalised the requested path before
matching it to the URI-worker map did not handle some edge cases
correctly. If only a sub-set of the URLs supported by Tomcat were
exposed via IIS, then it was possible for a specially constructed
request to expose application functionality through the reverse proxy
that was not intended for clients accessing the application via the
reverse proxy.

Mitigation
Users of affected versions should apply one of the following mitigations:
- - Upgrade to Apache Tomcat JK ISAPI Connector 1.2.43 or later.
- - Use alternative measures (e.g. the remote address filter) to restrict
  access to trusted users.

Credit:
This issue was discovered by Alphan Yavas from Biznet Bilisim A.S. and
reported responsibly to the Apache Tomcat Security Team.


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

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