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AUSCERT External Security Bulletin Redistribution
ESB-2016.1424
Multiple vulnerabilities have been identified in Apache Struts
7 June 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache Struts
Publisher: The Apache Software Foundation
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3093 CVE-2016-3087
Original Bulletin:
http://struts.apache.org/docs/s2-033.html
http://struts.apache.org/docs/s2-034.html
Comment: This bulletin contains two (2) The Apache Software Foundation
security advisories.
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S2-033
Summary
Remote Code Execution can be performed when using REST Plugin with ! operator
when Dynamic Method Invocation is enabled.
Who should read this
All Struts 2 developers and users
Impact of vulnerability
Possible Remote Code Execution
Maximum security rating
High
Recommendation
Disable Dynamic Method Invocation if possible. Alternatively upgrade to Struts
2.3.20.3, Struts 2.3.24.3 or Struts 2.3.28.1.
Affected Software
Struts 2.3.20 - Struts Struts 2.3.28 (except 2.3.20.3 and 2.3.24.3)
Reporter
Alvaro Munoz alvaro dot munoz at hpe dot com
CVE Identifier
CVE-2016-3087
Problem
It is possible to pass a malicious expression which can be used to execute
arbitrary code on server side when Dynamic Method Invocation is enabled when
using the REST Plugin.
Solution
Disable Dynamic Method Invocation when possible or upgrade to Apache Struts
versions 2.3.20.3, 2.3.24.3 or 2.3.28.1.
Backward compatibility
No issues expected when upgrading to Struts 2.3.20.3, 2.3.24.3 and 2.3.28.1
Workaround
Disable Dynamic Method Invocation or implement your own version of
RestActionMapper.
- ---
S2-034
Summary
OGNL cache poisoning can lead to DoS vulnerability
Who should read this
All Struts 2 developers and users
Impact of vulnerability
Possible DoS attack
Maximum security rating
Important
Recommendation
This issue was resolved by publising new OGNL version, any Struts version
which at least is using OGNL 3.0.12 is safe.
Affected Software
Struts 2.0.0 - Struts 2.3.24.1
Reporters
Tao Wang wangtao12 at baidu dot com - Baidu Security Response Center
CVE Identifier
CVE-2016-3093
Problem
The OGNL expression language used by the Apache Struts framework has inproper
implementaion of cache used to store method references. It's possible to
prepare a DoS attack which can block access to a web site.
Solution
You can should upgrade OGNL at least to version 3.0.12 or by upgrading to
latest Struts version.
Backward compatibility
No issues expected when upgrading to OGNL or Struts.
Workaround
Not possible except upgrading OGNL as mentioned above.
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