Описание
changedetection.io has a Server Side Template Injection using Jinja2 which allows Remote Command Execution
Summary
A Server Side Template Injection in changedetection.io caused by usage of unsafe functions of Jinja2 allows Remote Command Execution on the server host.
Details
changedetection.io version: 0.45.20
The vulnerability is caused by the usage of vulnerable functions of Jinja2 template engine.
PoC
- Create/Edit a URL watch item
- Under Notifications tab insert this payload:
- See Telegram (or other supported messaging app) notification
Impact
In the PoC I've used id as payload and Telegram to read the result.
Attackers can run any system command without any restriction and they don't need to read the result in the notification app (e.g. they could use a reverse shell).
The impact is critical as the attacker can completely takeover the server host.
This can be reduced if changedetection access is protected by login page with a password, but this isn't required by the application (not by default and not enforced).
References
- https://www.hacktivesecurity.com/blog/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io/
- https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti
- https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2/
- https://docs.cobalt.io/bestpractices/prevent-ssti/
Credits
Edoardo Ottavianelli
Ссылки
- https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-4r7v-whpg-8rx3
- https://nvd.nist.gov/vuln/detail/CVE-2024-32651
- https://blog.hacktivesecurity.com/index.php/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io
- https://github.com/dgtlmoon/changedetection.io/releases/tag/0.45.21
- https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2
Пакеты
changedetection.io
<= 0.45.20
0.45.21
Связанные уязвимости
changedetection.io is an open source web page change detection, website watcher, restock monitor and notification service. There is a Server Side Template Injection (SSTI) in Jinja2 that allows Remote Command Execution on the server host. Attackers can run any system command without any restriction and they could use a reverse shell. The impact is critical as the attacker can completely takeover the server machine. This can be reduced if changedetection is behind a login page, but this isn't required by the application (not by default and not enforced).