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Message-ID: <FB24803D1DF2A34FA59FC157B77C970504032089@idserv04.idef.com> Date: Thu, 10 Mar 2005 15:07:03 -0500 From: "iDEFENSE Labs" <labs-no-reply@...fense.com> To: <bugtraq@...urityfocus.com>, <vulnwatch@...nwatch.org> Subject: iDEFENSE Security Advisory 03.10.05: Ipswitch Collaboration Suite IMAP EXAMINE Buffer Overflow Vulnerability Ipswitch Collaboration Suite IMAP EXAMINE Buffer Overflow Vulnerability iDEFENSE Security Advisory 03.10.05 www.idefense.com/application/poi/display?id=216&type=vulnerabilities March 10, 2005 I. BACKGROUND Ipswitch Collaboration Suite (ICS) is a comprehensive communication and collaboration solution for Microsoft Windows with a customer base of over 53 million users. More information is available on the vendor's website: http://www.ipswitch.com/products/IMail_Server/index.html II. DESCRIPTION Exploitation of a remote buffer overflow within the IMAP daemon of Ipswitch Collaboration Suite allows attackers to execute arbitrary code with administrator privileges. The vulnerability specifically exists due to insufficient handling of overly long arguments passed to the EXAMINE handler function. The EXAMINE command selects a mailbox so that messages within the mailbox may be accessed with read-only privileges. EXAMINE requests with malformed mailbox names of 259 bytes will overwrite the saved stack frame pointer, resulting in potential process execution control. It should be noted that IMAP will append a '/' character to your supplied mailbox name so the most significant byte of the frame pointer will be 0x2e. The output below shows successful control of the frame pointer. (668.f8): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=00000006 ebx=008943b0 ecx=42424242 edx=00c8fad4 esi=008943b0 edi=00000013 eip=0078626d esp=00c9fd20 ebp=2e434343 iopl=0 nv up ei pl zr na po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000246 0078626d ?? ??? Frame pointer overwrites may allow attackers to redirect program flow when the current function returns. It should be noted that the IMAP EXAMINE command is only available after successful authentication. III. ANALYSIS Successful exploitation allows remote attackers to execute arbitrary code under administrator privileges. The EXAMINE IMAP command is only valid after authentication has occurred, however due to the nature of IMAP servers serving a large user base, this requirement only slightly reduces exposure to the vulnerability. IV. DETECTION iDEFENSE has confirmed that the IMAP4 daemon (IMAP4d32.exe ver. 12.8.27.14) shipping with IMail Server version 8.13 is vulnerable. IMail Server is now packaged as part of Ipswitch Collaboration Suite. It is suspected that earlier versions are vulnerable as well. V. WORKAROUND Use application level content filtering on overly long IMAP commands. VI. VENDOR RESPONSE This vulnerability is addressed in IMail Server 8.15 Hotfix 1 (February 3, 2005), which is available for download at: ftp://ftp.ipswitch.com/Ipswitch/Product_Support/IMail/IM815HF1.exe VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2005-0707 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 03/02/2005 Initial vendor notification 03/08/2005 Initial vendor response 03/10/2005 Public disclosure IX. CREDIT Nico Steinhardt is credited with this discovery. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp Free tools, research and upcoming events http://labs.idefense.com X. LEGAL NOTICES Copyright (c) 2005 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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