Eval Injection Affecting org.xwiki.platform:xwiki-platform-flamingo-theme-ui package, versions [12.6.6,13.10.11)[14.0-rc-1,14.4.7)[14.5,14.10)


Severity

Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.32% (71st percentile)

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  • Snyk IDSNYK-JAVA-ORGXWIKIPLATFORM-5421168
  • published13 Apr 2023
  • disclosed12 Apr 2023
  • creditUnknown

Introduced: 12 Apr 2023

CVE-2023-30537  (opens in a new tab)
CWE-95  (opens in a new tab)

How to fix?

Upgrade org.xwiki.platform:xwiki-platform-flamingo-theme-ui to version 13.10.11, 14.4.7, 14.10 or higher.

Overview

Affected versions of this package are vulnerable to Eval Injection such that any user with the right to add an object on a page 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 the styles properties FlamingoThemesCode.WebHome. This page is installed by default.

PoC

As a user without script or programming rights, edit your user profile with the object editor (enable advanced mode if necessary to get access) and add an object of type Theme Class of FlamingoThemesCode. In the field body-bg (all other fields should work, too) add the following text:

{{/html}} {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello " + "from groovy!"){{/groovy}}{{/async}}

Click "Save & View"

Open <xwiki-host>/xwiki/bin/view/FlamingoThemesCode/WebHomeSheet where <xwiki-host> is the URL of your XWiki installation

Expected result:

The list of color themes either doesn't include the user's profile or displays a regular preview.

Actual result:

The user's profile is listed as color theme but instead of the little preview the message

Failed to execute the [html] macro. Cause: [When using HTML content inline, you can only use inline HTML content. Block HTML content (such as tables) cannot be displayed. Try leaving an empty line before and after the macro.]. Click on this message for details.
Hello from groovy!">

is displayed. This shows that a Groovy macro with content created by the user has been executed and thus demonstrates a privilege escalation from simple user account to programming rights.

CVSS Scores

version 3.1