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Ipswitch IMail Server 2006 Multiple IMAP Buffer Overflow Vulnerabilities

07.18.07

BACKGROUND

Ipswitch Inc.'s IMail Server is an e-mail server aimed at providing easily configured and maintained e-mail services for small organizations. More information is available on the vendor's site at the following URL.

http://ipswitch.com/products/imail/index.asp

DESCRIPTION

Remote exploitation of multiple buffer overflow vulnerabilities in Ipswitch Inc.'s IMail Server 2006 could allow attackers to execute arbitrary code.

IMail includes an IMAP daemon that users can use to access their email. The "Search" IMAP command contains an exploitable stack-based buffer overflow vulnerability. Additionally, the "Search charset" contains an exploitable heap-based buffer overflow vulnerability.

ANALYSIS

Exploitation allows an attacker to execute arbitrary code with SYSTEM privileges.

In order to exploit these issues, an attacker would need to login to a vulnerable IMail IMAP Server using valid credentials.

The vulnerable component is installed with any IPSwitch product that includes the IMail Server. This includes products such as its Collaboration Suite packages.

DETECTION

iDefense has confirmed the existence of these vulnerabilities in IMail Server 2006. The vulnerable executable used was version 6.8.8.1 of imapd32.exe.

WORKAROUND

Disabling the IMAP service prevents exploitation of these vulnerabilities. Consider enabling POP3 or webmail as an alternative to IMAP.

VENDOR RESPONSE

Ipswitch Inc. has released version 2006.21 of its IMail product to address these vulnerabilities. More information can be found at the following URL.

http://docs.ipswitch.com/IMail%202006.21/ReleaseNotes/IMail_RelNotes.htm#NewRelease

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

02/13/2007 Initial vendor notification
07/17/2007 Initial vendor response
07/18/2007 Coordinated public disclosure

CREDIT

The stack-based buffer overflow vulnerability was reported to iDefense by Manuel Santamarina Suarez. The heap-based buffer overflow discoverer wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2007 Verisign, 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 e-mail customer service 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.