[jira] [Commented] (VELTOOLS-170) Upgrade beanutils to 1.9.2 & supress access to class and Class

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[jira] [Commented] (VELTOOLS-170) Upgrade beanutils to 1.9.2 & supress access to class and Class

Velocity - Dev mailing list-2

    [ https://issues.apache.org/jira/browse/VELTOOLS-170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16107292#comment-16107292 ]

Jon Harper commented on VELTOOLS-170:

Thanks for the update Mark. The new status is coherent with what I observed in my tests. Using SUPPRESS_CLASS is a sufficiant fix.

> Upgrade beanutils to 1.9.2 & supress access to class and Class
> --------------------------------------------------------------
>                 Key: VELTOOLS-170
>                 URL: https://issues.apache.org/jira/browse/VELTOOLS-170
>             Project: Velocity Tools
>          Issue Type: Bug
>          Components: Build
>    Affects Versions: 2.0
>            Reporter: Mark Symons
>            Priority: Critical
> Update dependency on commons-beanutils:commons-beanutils to v1.9.2 and mitigate CVE-2014-0114.   See BEANUTILS-463 for fix info.
> Velocity Tools v2.0 currently uses bean-utils v1.7.0
> Whilst the CVE text references beanutils v1.8.0,  Black Duck Hub threat analysis have updated affected versions to include 1.7.0.
> {quote}
> Apache Commons BeanUtils, as distributed in lib/commons-beanutils-1.8.0.jar in Apache Struts 1.x through 1.3.10 and in other products requiring commons-beanutils through 1.9.2, does not suppress the class property, which allows remote attackers to "manipulate" the ClassLoader and execute arbitrary code via the class parameter, as demonstrated by the passing of this parameter to the getClass method of the ActionForm object in Struts 1.
> {quote}
> h5.CVSS Version 2 Metrics:
> Access Vector: Network exploitable
> Access Complexity: Low
> Authentication: Not required to exploit
> Impact Type:
> * Allows unauthorized disclosure of information
> * Allows unauthorized modification
> * Allows disruption of service
> h3.Edit: 28th November 2016
> Sonatype Nexus IQ identifies beanutils as a threat as of v1.24 (late November 2016).  From the vulnerability information provided (and highlighting in red the bit that applies to Velocity Tools):
> {quote}
> h4.Explanation
> Apache Commons BeanUtils is vulnerable to ClassLoader manipulation which can lead to Remote Code Execution (RCE). Access to the {{class}} and {{Class}} properties is not suppressed, exposing them by default. An attacker can construct malicious input using the {{class property}} in order to manipulate the {{ClassLoader}} potentially leading to arbitrary code execution.
> h4.Detection
> {color:red}If you are the calling application, you are vulnerable by running this component without filtering the property names {{class}} and {{Class}}{color}. If this is a transitive dependency, you will want to contact the parent project to ensure they have added a mitigating control.
> Note: If you are using the built-in implementation of {{SuppressPropertiesBeanIntrospector}} added in version 1.9.2 of {{commons-beanutils}} as your mitigation you are still vulnerable. Although the built-in implementation specifically suppresses the {{class}} properly, it does not also suppress {{Class}}.
> h4.Recommendation
> Although commons-beanutils offers a built-in implementation of SuppressPropertiesBeanIntrospector in version 1.9.2 that specifically suppresses the “class” properly, it does not also suppress “Class”. Due to this insufficient fix which is also not enabled by default, we recommend implementing your own custom mitigating control such as the one found here -
> https://community.hpe.com/t5/Security-Research/Protect-your-Struts1-applications/ba-p/6463188#.VCUfrhYvBaV.
> {quote}

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