iDEFENSE Security Advisory 05.24.05: Ipswitch IMail IMAP SELECT Command DoS Vulnerability

2005-05-25T00:00:00
ID SECURITYVULNS:DOC:8709
Type securityvulns
Reporter Securityvulns
Modified 2005-05-25T00:00:00

Description

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

I. BACKGROUND

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:

http://www.ipswitch.com/products/IMail_Server/index.html.

II. DESCRIPTION

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.

III. ANALYSIS

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

IV. DETECTION

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.

V. WORKAROUND

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:

ftp://ftp.ipswitch.com/Ipswitch/Product_Support/IMail/imail82hf2.exe

The associated vendor advisory can be found at:

http://www.ipswitch.com/support/imail/releases/imail_professional/im82hf 2.html

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

IX. CREDIT

Sebastian Apelt is credited with this discovery.

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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@idefense.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.