[jira] [Commented] (OFBIZ-11709) Prevent FreeMarker Template Injection (SSTI)

[Nicolas Malin (Jira)]

    [ https://issues.apache.org/jira/browse/OFBIZ-11709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17109190#comment-17109190 ]

Pierre Smits commented on OFBIZ-11709:
--------------------------------------

Thanks for keeping OFBiz safe, [~jleroux]

> Prevent FreeMarker Template Injection (SSTI)
> --------------------------------------------
>
>                 Key: OFBIZ-11709
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-11709
>             Project: OFBiz
>          Issue Type: Sub-task
>          Components: framework
>    Affects Versions: Release Branch 18.12, Release Branch 17.12, Trunk
>            Reporter: Jacques Le Roux
>            Assignee: Jacques Le Roux
>            Priority: Critical
>             Fix For: 18.12.01, 17.12.04
>
>
> This issue was initially reported to the security team by Alvaro Munoz <[hidden email]> from the GitHub Security Lab team <[hidden email]>. It was also reported 15 days later by Kai Zhao <[hidden email]>.
> It's a well known *post-auth* vulnerability[1][2][3] so *no CVE* was created. It relies on Freemarker freemarker.template.utility.Execute class and new() built-in.
> Since Freemarker 2.3.17 a known solution to these issues is to register a TemplateClassResolver in Freemarker configuration in order to limit which TemplateModels can be instantiated in the templates. The predefined resolver SAFER_RESOLVER doesn't allow to instantiate the Execute class[4]. So the solution is to add the line
> {code:java}
> newConfig.setNewBuiltinClassResolver(TemplateClassResolver.SAFER_RESOLVER);
> {code}
> in FreeMarkerWorker.java
> In [1] a concern about the Freemarker api buit-in is mentioned. Actually this is not a concern by default in Freemarker[5] and OFBiz
> bq. The api_builtin_enabled configuration setting must be set to true. Its default is false (at least as of 2.3.22) for not lowering the security of existing applications.
> [1] https://ackcent.com/blog/in-depth-freemarker-template-injection/
> [2] https://insinuator.net/2016/07/dilligent-bug/
> [3] https://portswigger.net/research/server-side-template-injection
> [4] https://freemarker.apache.org/docs/api/freemarker/core/TemplateClassResolver.html#SAFER_RESOLVER
> [5] https://freemarker.apache.org/docs/ref_builtins_expert.html#ref_buitin_api_and_has_api

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