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                         AUSCERT Security Bulletin

                               ASB-2018.0201
                       Apache Struts 2 Vulnerability
                              23 August 2018

===========================================================================

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

Product:              Apache Struts 2
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2018-11776  
Member content until: Saturday, September 22 2018

OVERVIEW

        Apache Struts 2 is found with a possible remote code execution 
        vulnerability for versions: 
         o Struts 2.3 - Struts 2.3.34 
         o Struts 2.5 - Struts 2.5.16 [1]


IMPACT

        The Apache Software Foundation has provided the following 
        description of the impact for the vulnerability.
        
        "CVE Identifier : CVE-2018-11776" [1]
        "Impact of vulnerability : Possible Remote Code Execution when using
        results with no namespace and in same time, its upper action(s) have
        no or wildcard namespace. Same possibility when using url tag which
        doesn’t have value and action set." [1]


MITIGATION

        Solution
        
        "Upgrade to Apache Struts version 2.3.35 or 2.5.17." [1]
        
        Workaround
        
        "Verify that you have set (and always not forgot to set) namespace 
        (if is applicable) for your all defined results in underlying 
        configurations. Also verify that you have set (and always not forgot
        to set) value or action for all url tags in your JSPs. Both are 
        needed only when their upper action(s) configurations have no or 
        wildcard namespace." [1]
        
        "This is a temporal weak workaround. Please upgrade to Apache Struts
        version 2.3.35 or 2.5.17 ASAP because they also contain critical 
        overall proactive security improvements" [1]


REFERENCES

        [1] Apache Struts 2 Documentation S2-057
            https://cwiki.apache.org/confluence/display/WW/S2-057

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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