Summary

Broken Access Control Vulnerability in Apache Struts2

Who should read this

All Struts 2 developers and users

Impact of vulnerability

Permissions, Privileges, and Access Controls

Maximum security rating

Important

Recommendation

Developers should immediately upgrade to Struts 2.3.15.3

Affected Software

Struts 2.0.0 - Struts 2.3.15.2

Reporter

Zhu Gang, Zhang Jin, Huawei PSIRT

CVE Identifier

CVE-2013-4310

Problem

The Struts 2 action mapping mechanism supports the special parameter prefix action: which is intended to help with attaching navigational information to buttons within forms.

In Struts 2 before 2.3.15.3, under certain conditions this can be used to bypass security constraints. More details will available later on when the patch will be widely adopted.

Solution

In Struts 2.3.15.3 the action mapping mechanism was changed to avoid circumventing security constraints. Two additional constants were introduced to steer behaviour of DefaultActionMapper:

After upgrading to Struts 2.3.15.3, applications using the "action:" will stop working. You can use above constants to steer that behaviour.

It is strongly recommended to upgrade to Struts 2.3.15.3, which contains the corrected Struts2-Core library.