CVE-2022-24442: FreeMarker Server-Side Template Injection in JetBrains YouTrack

By inserting malicious content in the Notification FTL files, an attacker may perform SSTI (Server-Side Template Injection) attacks, which can leverage FreeMarker exposed objects to bypass restrictions and obtain RCE (Remote Code Execution).

Note: This issue exists because of an incomplete fix for CVE-2021-25770.

Vendor Disclosure:

The vendor's disclosure and fix for this vulnerability can be found here.

Requirements:

This vulnerability requires:

• Valid user credentials

Proof Of Concept:

More details and the exploitation process can be found in this PDF.

Additional Resources:

Awesome article by Vincent Herbulot of Synacktiv that inspired the finding of this vulnerability.

Initial vulnerability CVE-2021-25770 discovered by Vasily Vasilkov.