A vulnerability was found in XWiki Platform (Content Management System). It has been rated as very critical. This issue affects some unknown functionality of the component UIX Parameter Handler. The manipulation with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions any user with view rights can execute arbitrary Groovy, Python or Velocity code in XWiki leading to full access to the XWiki installation. The root cause is improper escaping of UIX parameters. A proof of concept exploit is to log in, add an `XWiki.UIExtensionClass` xobject to the user profile page, with an Extension Parameters content containing `label={{/html}} {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello " + "from groovy!"){{/groovy}}{{/async}}`. Then, navigating to `PanelsCode.ApplicationsPanelConfigurationSheet` (i.e., `/xwiki/bin/view/PanelsCode/ApplicationsPanelConfigurationSheet` where `` is the URL of your XWiki installation) should not execute the Groovy script. If it does, you will see `Hello from groovy!` displayed on the screen. This vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10-rc-1. Users are advised to upgrade. For users unable to upgrade the issue can be fixed by editing the `PanelsCode.ApplicationsPanelConfigurationSheet` wiki page and making the same modifications as shown in commit `6de5442f3c`.

The weakness was disclosed 03/08/2023 as GHSA-qxjg-jhgw-qhrv. The advisory is shared at github.com. The identification of this vulnerability is CVE-2023-27479 since 03/01/2023. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/08/2023). MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 13.10.11, 14.4.7 or 14.10-rc-1 eliminates this vulnerability. Applying the patch 6de5442f3c91c3634a66c7b458d5b142e1c2a2dc is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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• Content Management System

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• XWiki Platform

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• open-source

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