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| Excerpt |
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A vulnerability introduced by wildcard matching mechanism or double evaluation of OGNL Expression allows remote command execution. |
Who should read this | All Struts 2 developers and users |
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Impact of vulnerability | Remote command execution, remote server context manipulation, injection of malicious client side code |
Maximum security rating | Highly Critical |
Recommendation | Developers should immediately upgrade to Struts 2.3.14.3 |
Affected Software | Struts 2.0.0 - Struts 2.3.14.2 |
Reporter | Jon Passki from Coverity Security Research Laboratory reported directly to security@struts.a.o and via blog post |
CVE Identifier | CVE-2013-1966 - TBD2135, CVE-2013-2134 |
Problem
Struts 2 allows define action mapping base on wildcards, like in example below:
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If a request doesn't match any other defined action, it will be matched by * and requested action name will be used to load JSP file base on the name of action. And as value of {1} is threaten as an OGNL expression, thus allow to execute arbitrary Java code on server side. This vulnerability is combination of two problems:
- requested action name isn't escaped or checked agains whitelist
- double evaluation of an OGNL expression in
TextParseUtil.translateVariableswhen combination of$and%open chars is used.
Proof of concept
Wildcard matching
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| Warning |
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It is strongly recommended to upgrade to Struts 2.3.14.3, which contains the corrected OGNL and XWork library. |