Ipswitch IMail IMAP SELECT Command DoS Vulnerability
iDEFENSE Security Advisory 05.24.05 www.idefense.com/application/poi/display?id=241&type=vulnerabilities May 24, 2005
Ipswitch IMail server is a Windows based messaging solution with a customer base of over 53 million users. More information about the application is available at:
Remote exploitation of a denial of service vulnerability in Ipswitch Inc.'s Imail IMAP server allows attackers to crash the target service thereby preventing legitimate usage.
The problem specifically exists in the handling of long arguments to the SELECT command. When a string approximately 260 bytes in size is supplied a stack-based buffer overflow occurs that results in an unhandled access violation forcing the daemon to exit. The issue is not believed to be further exploitable.
Successful exploitation allows remote to crash vulnerable IMAP servers and thereby prevent legitimate usage. The SELECT command is only available post authentication and therefore valid credentials are required to exploit this vulnerability
iDEFENSE has confirmed the existence of this vulnerability in the latest version of Ipswitch IMAIL, version 8.13. Version 8.12 is also confirmed as vulnerable. It is suspected that earlier versions are vulnerable as well.
As this vulnerability is exploited after authentication occurs, ensuring
that only trusted users have accounts can mitigate the risk somwhat. As a more effective workaround, consider limiting access to the IMAP server
by filtering TCP port 143. If possible, consider disabling IMAP and forcing users to use POP3.
VI. VENDOR RESPONSE
The vendor has released the following patch to fix this vulnerability:
The associated vendor advisory can be found at:
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2005-1254 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
04/15/2005 Initial vendor notification 05/10/2005 Initial vendor response 05/24/2005 Coordinated public disclosure
Sebastian Apelt is credited with this discovery.
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X. LEGAL NOTICES
Copyright (c) 2005 iDEFENSE, Inc.
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