CVE-2021-21379: It's possible to execute anything with the rights of the author of a macro which uses the {{wikimacrocontent}} macro
First published: Fri Mar 12 2021(Updated: )
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions of XWiki Platform, the `{{wikimacrocontent}}` executes the content with the rights of the wiki macro author instead of the caller of that wiki macro. This makes possible to inject scripts through it and they will be executed with the rights of the wiki macro (very often a user which has Programming rights). Fortunately, no such macro exists by default in XWiki Standard but one could have been created or installed with an extension. This vulnerability has been patched in versions XWiki 12.6.3, 11.10.11 and 12.8-rc-1. There is no easy workaround other than disabling the affected macros. Inserting content in a safe way or knowing what is the user who called the wiki macro is not easy.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xwiki | >=11.4<11.10.11 | |
| Xwiki | >=12.0<12.6.3 | |
| Xwiki | >=12.7<=12.7.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-21379?
CVE-2021-21379 has been assigned a medium severity level due to the potential for unauthorized access to sensitive content.
How do I fix CVE-2021-21379?
To fix CVE-2021-21379, upgrade XWiki Platform to version 12.7.2 or later.
What versions of XWiki are affected by CVE-2021-21379?
CVE-2021-21379 affects XWiki versions from 11.4 to 11.10.11 and from 12.0 to 12.6.3, as well as version 12.7.
What does CVE-2021-21379 exploit in XWiki Platform?
CVE-2021-21379 exploits a vulnerability in the {{wikimacrocontent}} feature, executing content with the rights of the macro author instead of the caller.
Is there a workaround for CVE-2021-21379 if I cannot upgrade?
There is no official workaround for CVE-2021-21379; upgrading to a patched version is the recommended action.
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