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GHSA-94pf-92hw-2hjc

CriticalCVSS 9.9 / 10
Published Jun 30, 2023·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

Impact

Any user who can edit their own user profile and notification settings can execute arbitrary script macros including Groovy and Python macros that allow remote code execution including unrestricted read and write access to all wiki contents. This can be reproduced with the following steps:

  1. Login as a user without script or programming right.
  2. Go to the notifications preferences in your user profile.
  3. Disable the "Own Events Filter" and enable notifications in the notification menu for "Like".
  4. Set your first name to {{cache id="security" timeToLive="1"}}{{groovy}}println("Hello from groovy!"){{/groovy}}{{/cache}}
  5. Click on the like button at the bottom left of the user profile.
  6. Click on the notifications bell in the top bar and then on "RSS Feed".

If the text "Profile of Hello from groovy!" and/or "liked by Hello from groovy!" is displayed, the attack succeeded. The expected result would have been that the entered first name is displayed as-is in the description of the feed.

Patches

This has been patched in XWiki 14.10.6 and 15.2RC1.

Workarounds

The main security fix can be manually applied by patching the affected document XWiki.Notifications.Code.NotificationRSSService as shown in the patch. This will break the link to the differences, though as this requires additional changes to Velocity templates as shown in the patch. While the default template is available in the instance and can be easily patched, the template for mentions is contained in a .jar-file and thus cannot be fixed without replacing that jar.

References

  • https://jira.xwiki.org/browse/XWIKI-20610
  • https://github.com/xwiki/xwiki-platform/commit/217e5bb7a657f2991b154a16ef4d5ae9c29ad39c
Risk Scores
Base Score
9.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
9.1

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS
82.38%

The exploit probability is critical. The vulnerability is very likely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity
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