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Date: Tue, 8 Dec 2020 07:55:04 +0100
From: Lukasz Lenart <lukaszlenart@...che.org>
To: Struts Users Mailing List <user@...uts.apache.org>
Cc: "announcements@...uts.apache.org" <announcements@...uts.apache.org>, announce@...che.org,
"security@...uts.apache.org" <security@...uts.apache.org>, oss-security@...ts.openwall.com,
bugtraq@...urityfocus.com
Subject: Apache Struts 2: CVE-2020-17530: Potential RCE when using forced evaluation
Forced OGNL evaluation, when evaluated on raw user input in tag
attributes, may lead to remote code execution.
Problem
Some of the tag's attributes could perform a double evaluation if a
developer applied forced OGNL evaluation by using the %{...} syntax.
Using forced OGNL evaluation on untrusted user input can lead to a
Remote Code Execution and security degradation.
Solution
Avoid using forced OGNL evaluation on untrusted user input, and/or
upgrade to Struts 2.5.26 which checks if expression evaluation won't
lead to the double evaluation.
Please read our Security Bulletin for more details:
https://cwiki.apache.org/confluence/display/WW/S2-061
This vulnerability was identified by:
- Alvaro Munoz - pwntester at github dot com
- Masato Anzai of Aeye Security Lab, inc.
All developers are strongly advised to perform this action.
Kind regards
--
Łukasz
+ 48 606 323 122 http://www.lenart.org.pl/
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