Description
In Apache Struts 2.3.7 through 2.3.33 and 2.5 through 2.5.12, if an application allows entering a URL in a form field and built-in URLValidator is used, it is possible to prepare a special URL which will be used to overload server process when performing validation of the URL. NOTE: this vulnerability exists because of an incomplete fix for S2-047 / CVE-2017-7672.
Remediation
References
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-003.txt
http://www.oracle.com/technetwork/security-advisory/alert-cve-2017-9805-3889403.html
http://www.securityfocus.com/bid/100612
http://www.securitytracker.com/id/1039261
https://security.netapp.com/advisory/ntap-20180629-0001/
https://struts.apache.org/docs/s2-050.html
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170907-struts2
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