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Struts2: Is it safe to re-enable DMI ?

+1 vote
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Just after updating struts to 2.3.15.2, all of ours applications stop working. Some of ours applications uses struts-convention-plugin, so only url can be used to access action's methods.

We are using a lot of url with "!input" methods, especially to manage form input and form validation.

"S2-019 - Dynamic Method Invocation disabled by default", seems to be a big security issue. So, is it safe to re-enable back DMI to true ? If not, how is it possible to not use DMI ?

posted Sep 25, 2013 by Salil Agrawal

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2 Answers

+1 vote

It isn't if you know what you doing - a small example: login!getPassword ;-) You can also switch to Strict DMI but only via XML - I'm working on solution to have it also for annotations.

And in the future I'm planning to have only Strict DMI which means white-listing which actions/methods can be access via DMI

answer Sep 25, 2013 by Garima Jain
+1 vote

See - http://struts.apache.org/release/2.3.x/docs/getting-started.html - the tutorial on using Wildcard Method Selection may be helpful.

Using the ! (bang) operator and dynamic method invocation is a security problem. See:
http://www.brucephillips.name/blog/index.cfm/2011/2/19/Struts-2-Security-Vulnerability--Dynamic-Method-Invocation

answer Sep 25, 2013 by Jagan Mishra
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