9.9 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
0.002 Low
EPSS
Percentile
55.3%
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.
Steps to reproduce:
{{/html}} {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello " + "from groovy!"){{/groovy}}{{/async}}
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.
The vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10.
The issue can be fixed by applying this patch on FlamingoThemesCode.WebHomeSheet
.
If you have any questions or comments about this advisory: