THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Summary
| Excerpt |
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Cross-Site Scripting Vulnerability in Debug Mode and in exposed JSP filesSpecial |
Who should read this | All Struts 2 developers and users |
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Impact of vulnerability | Affects of a cross-site scripting vulnerability when debug mode is switched on or JSPs are exposed in production environment.Manipulation of Struts' internals, altering of user session, container's web context modification |
Maximum security rating | LowHigh |
Recommendation | Turn off debug mode in production environment, apply tips from Security guideline to secure JSPsUpdate regex used to excluded vulnerable incoming parameters. An upgrade to Struts 2.3.2024.1 is recommended. |
Affected Software | Struts 2.0.0 - Struts Struts 2.3.16.324 |
Reporter | Takayoshi Isayama, Mitsui Bussan Secure Directions, Inc. (vulnerability with JSPs) anonymous (vulnerability with devMode) |
CVE Identifier | CVE-2015-5169 |
Problem
When the Struts2 debug mode is turned on, under certain conditions an arbitrary script may be executed in the 'Problem Report' screen. Also if JSP files are exposed to be accessed directly it's possible to execute an arbitrary script.
Solution
It is generally not advisable to have debug mode switched on outside of the development environment. Debug mode should always be turned off in production setup. Also never expose JSPs files directly and hide them inside WEB-INF folder or define dedicated security constraints to block access to raw JSP files. Please also read our Security guide - it contains useful informations how to secure your application.
rskvp93 at gmail dot com from Viettel Information Security Center | |
CVE Identifier | TBD |
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Problem
OGNL defines special top object which represents root of execution context. It can be used to manipulate Struts' internals or can be used to affect container's settings
Solution
Applying better regex which includes pattern to exclude request parameters trying to use top object. We Struts >= 2.3.20 is not vulnerable to this attack. We recommend upgrading to Struts 2.3.24.20 1 or higher.
Backward compatibility
No If application is using parameter named top it won't be mapped to an action. I other case no backward compatibility problems are expected.
Workaround
...
Applying the below patterns will solve the problem as well:
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"(^|\\%\\{)(top(\\.|\\['|\\[\")|#)?(dojo|struts|session|request|application|servlet(Request|Response)|parameters|context|_memberAccess)(\\.|\\[).*",
"^(action|method):.*" |