GHSA-w47q-945m-q9pc
Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| PyPI | document-merge-service | < 9.1.0 | 9.1.0 |
Details
As written in the advisory (Markdown source, shown as plain text).
### 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. The vulnerability is limited to XLSX templates, were the `xltpl` library uses a npn-sandboxed Jinja environment for the processing of the template.
### Patches
It has been patched in [v9.1.0](https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0)
### Workarounds
Disable the upload/usage of XLSX templates.
### References
Are there any links users can visit to find out more?
https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti
References
External links from the advisory. They lead to third-party sites.