Summary
Possible DoS attack when usingURLValidatorWho should read this | All Struts 2 developers and users |
|---|---|
Impact of vulnerability | Possible DoS attack when using URLValidator |
Maximum security rating | Low |
Recommendation | Upgrade to Struts 2.5.6 |
Affected Software | Struts 2.3.20 - Struts Struts 2.3.28.1 and Struts 2.5 |
Reporter | ASAI Ken tc535mr2 at gmail dot com |
CVE Identifier | CVE-2016-4465 |
Problem
If an application allows enter na URL field in a form and built-in URLValidator is used, it is possible to prepare a special URL which will be used to overload server process when performing validation of the URL.
Solution
Upgrade to Apache Struts version 2.5.6.
Backward compatibility
No backward incompatibility issues are expected.
Workaround
Trim passed value before assigning it to a field, e.g.
public String setUserUrl(String userUrl) {
this.userUrl = userUrl.trim();
}