XWiki Platform vulnerable to privilege escalation via async macro and IconThemeSheet from the user profile

One can execute any wiki content with the right of IconThemeSheet author by creating an icon theme with the following content:

}}}
{{async async="true"}}
{{groovy}}
  println("Hello from Groovy!")
{{/groovy}}
{{/async}}
{{{

Can be done by creating a new page or even through the user profile for users not having edit right.

This has been patched in XWiki 14.9, 14.4.6, and 13.10.10.

An easy workaround is to actually fix the bug in the page IconThemesCode.IconThemeSheet by applying the following modification: xwiki/xwiki-platform@48caf74#diff-2ec9d716673ee049937219cdb0a92e520f81da14ea84d144504b97ab2bdae243R45

If you have any questions or comments about this advisory:

tmortagne published to xwiki/xwiki-platform Mar 1, 2023

Published by the National Vulnerability Database Mar 2, 2023

Published to the GitHub Advisory Database Mar 3, 2023

Reviewed Mar 3, 2023

Last updated Mar 3, 2023

Provide feedback