When the above invocation will result with 2 in response body - we will be sure that the expression got evaluated, and thus the application is vulnerable to RCE. Now, in order to execute one command, and get the first line out of it - there can be used the following expression:. Where we have invocation of uname -a command within linux boxes. In order to drop a bind shell on the server, the following method could be leveraged:. Skip to content.
Sign in Sign up. Instantly share code, notes, and snippets. Last active Jul 1, Code Revisions 5 Stars 8 Forks Embed What would you like to do? Embed Embed this gist in your website. During my lab setup I noticed that the source code of the webconsole. Older versions make use of the dojo. Attempting to use the OGNL console with these older version results in the below error dojo. To fix this we can modify the webconsole. In later Struts 2 versions, a blacklist of classes and packages is also introduced.
The list of blacklisted classes can be found in struts-default. Depending on the version of Struts 2 in use, a number of bypasses exist that allow for execution of OGNL code without restriction. A fantastic summary of these bypasses and the Struts 2 versions they affect can be found here.
As I mentioned earlier, depending on the Struts 2 version in use the content of the webconsole. Looking at the tags on the Apache Struts Github history, we see that the version of the webconsole. Based on this observation we know that the target Struts 2 version must be somewhere between 2. Although we do not know the exact Struts 2 version in use on the target, we can iterate through each of the bypasses listed in the link above for versions 2.
In order to debug the OGNL sandbox escape separately to our command execution payload, we can first try to call a method which should be blocked to determine if the sandbox escape was successful before continuing with our payload. As the class blacklist was not introduced until after 2. In this case null is returned, so we can assume the version in use here is later than 2. Learn more. Struts dev. Asked 9 years, 11 months ago. Active 6 years, 4 months ago. Viewed 5k times. Improve this question.
Add a comment. Active Oldest Votes. It will also reload your xml configuration files struts. This is useful for testing or finetuning your configuration, without having to redeploy your application every time. Improve this answer.
Umesh Awasthi Umesh Awasthi Thanks Umesh it was really helpful — anoop. Sign up or log in Sign up using Google.
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