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AUSCERT External Security Bulletin Redistribution
ESB-2017.1714
Possible RCE in the Struts Showcase app in the Struts 1
plugin example in Struts 2.3.x series
10 July 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache Struts
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2017-9791
Original Bulletin:
http://struts.apache.org/docs/s2-048.html
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S2-048
Summary
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 <ic3z at qq dot com> from Tophant Competence Center
CVE Identifier CVE-2017-9791
Problem
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.
Solution
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"));
Backward compatibility
No backward incompatibility issues are expected.
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