St2-048 Remote Code Execution Vulnerability

Apache Struts 2 possible RCE in the Struts Showcase app in the Struts 1 plugin example in the Struts 2.3.x series

http://struts.apache.org/docs/s2-048.html

https://cwiki.apache.org/confluence/display/WW/S2-048

Use-Age:

> python St2-048.py

set url : http://xx.xx.xx.xx:port/integration/saveGangster.action

cmd >>: whoami
root

cmd >>: cat /etc/passwd

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 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.

参考文章链接：

【漏洞分析】Struts2高危漏洞S2-048分析

http://m.bobao.360.cn/learning/detail/4078.html