Description
Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.
Remediation
References
http://packetstormsecurity.com/files/172830/Apache-Struts-Remote-Code-Execution.html
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-005.txt
http://www.oracle.com/technetwork/security-advisory/alert-cve-2018-11776-5072787.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/105125
http://www.securitytracker.com/id/1041547
http://www.securitytracker.com/id/1041888
https://cwiki.apache.org/confluence/display/WW/S2-057
https://github.com/hook-s3c/CVE-2018-11776-Python-PoC
https://lgtm.com/blog/apache_struts_CVE-2018-11776
https://lists.apache.org/thread.html/r6d03e45b81eab03580cf7f8bb51cb3e9a1b10a2cc0c6a2d3cc92ed0c%40%3Cannounce.apache.org%3E
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0012
https://security.netapp.com/advisory/ntap-20180822-0001/
https://security.netapp.com/advisory/ntap-20181018-0002/
https://www.exploit-db.com/exploits/45260/
https://www.exploit-db.com/exploits/45262/
https://www.exploit-db.com/exploits/45367/
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-11776
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