CVE-2023-36471 PoC — HTML sanitizer allows form elements in restricted in org.xwiki.commons:xwiki-commons-xml

Source

https://github.com/shoucheng3/xwiki__xwiki-commons_CVE-2023-36471_14-10-5

Associated Vulnerability

Title: HTML sanitizer allows form elements in restricted in org.xwiki.commons:xwiki-commons-xml (CVE-2023-36471)
Description:Xwiki commons is the common modules used by other XWiki top level projects. The HTML sanitizer that is included in XWiki since version 14.6RC1 allowed form and input HTML tags. In the context of XWiki, this allows an attacker without script right to either create forms that can be used for phishing attacks or also in the context of a sheet, the attacker could add an input like `{{html}}<input type="hidden" name="content" value="{{groovy}}println("Hello from Groovy!")" />{{/html}}` that would allow remote code execution when it is submitted by an admin (the sheet is rendered as part of the edit form). The attacker would need to ensure that the edit form looks plausible, though, which can be non-trivial as without script right the attacker cannot display the regular content of the document. This has been patched in XWiki 14.10.6 and 15.2RC1 by removing the central form-related tags from the list of allowed tags. Users are advised to upgrade. As a workaround an admin can manually disallow the tags by adding `form, input, select, textarea, button` to the configuration option `xml.htmlElementSanitizer.forbidTags` in the `xwiki.properties` configuration file.

Readme

# XWiki Commons

[XWiki Commons](http://commons.xwiki.org/xwiki/bin/view/Main/) are technical libraries common to several other top level XWiki projects. 

These libraries can be used by projects outside of the XWiki ecosystem, are generic and not related to the wiki domain.

XWiki Platform, XWiki Commons and XWiki Rendering are part of the [XWiki.org](http://www.xwiki.org/) software forge. They are released together and share the same version.

## Documentation
* [Documentation](http://commons.xwiki.org/)
* [API](http://platform.xwiki.org/xwiki/bin/view/DevGuide/API)
* [Development Zone](http://dev.xwiki.org/xwiki/bin/view/Community/)

## Download
The XWiki Commons JARs are available in the [![Maven Central Repository](https://img.shields.io/maven-central/v/org.xwiki.commons/xwiki-commons.svg?maxAge=3600)](http://search.maven.org/#search|ga|1|g%3A%22org.xwiki.commons%22).

## Release Notes
Read our [Release Notes](http://www.xwiki.org/xwiki/bin/view/ReleaseNotes/).

## Tools
* [Continuous Integration](http://ci.xwiki.org/) setup launches a build for each commit
* [Issue Tracker](http://jira.xwiki.org/browse/XCOMMONS) if you want to report an issue
* [Development Flow](http://dev.xwiki.org/xwiki/bin/view/Community/DevelopmentPractices#HGeneralDevelopmentFlow) to see the full list of tools we use to build XWiki
* [![Revved up by Gradle Enterprise](https://img.shields.io/badge/Revved%20up%20by-Gradle%20Enterprise-06A0CE?logo=Gradle&labelColor=02303A)](https://ge.xwiki.org/scans)

## Community
We're always looking for contributors! 
You should read our [Get Involved Guide](http://dev.xwiki.org/xwiki/bin/view/Community/Contributing) or get in touch:
* [Blog](http://www.xwiki.org/xwiki/bin/view/Blog/)
* [Forum](https://dev.xwiki.org/xwiki/bin/view/Community/Discuss)
* [Chat](https://dev.xwiki.org/xwiki/bin/view/Community/Chat)

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