http://struts.apache.org/docs/s2-048.html
https://cwiki.apache.org/confluence/display/WW/S2-048
> python St2-048.py
set url : http://xx.xx.xx.xx:port/integration/saveGangster.action
cmd >>: whoami
root
cmd >>: cat /etc/passwd
Possible RCE in the Struts Showcase app in the Struts 1 plugin example in Struts 2.3.x series
Who should read this All Struts 2 developers and users should read this
Impact of vulnerability Possible RCE when using the Struts 2 Struts 1 plugin
Maximum security rating High
Recommendation Please read the Solution section
Affected Software Struts 2.3.x with Struts 1 plugin and Struts 1 action
Reporter icez from Tophant Competence Center
CVE Identifier CVE-2017-9791
It is possible to perform a RCE attack with a malicious field value when using the Struts 2 Struts 1 plugin and it's a Struts 1 action and the value is a part of a message presented to the user, i.e. when using untrusted input as a part of the error message in the ActionMessage class.
Always use resource keys instead of passing a raw message to the ActionMessage as shown below, never pass a raw value directly
messages.add("msg", new ActionMessage("struts1.gangsterAdded", gform.getName()));
and never like this
messages.add("msg", new ActionMessage("Gangster " + gform.getName() + " was added"));
No backward incompatibility issues are expected.