Public Vulnerability Reports

Ipswitch Instant Messaging Server Denial of Service Vulnerability



Ipswitch Instant Messaging is the instant messaging software that is included with Ipswitch Collaboration Suite (ICS). ICS is a collaboration software system that includes email, shared folders, as well as instant messaging capabilities. More information is available on the vendor's site at the following URL.


Remote exploitation of a Denial of Service vulnerability in Ipswitch Inc.'s IM Server daemon allows unauthenticated attackers to crash the service.

Under default configuration, the IM Server service does not automatically restart in the event of a failure.

The vulnerable section of code can be reached through any of the following functions.

 DoAttachVideoSender DoAttachVideoReceiver DoAttachAudioSender DoAttachAudioReceiver 


Exploitation allows unauthenticated remote attackers to crash the service. The service does not auto-restart.

Successful exploitation would lead to a break in IM communications through the server.

In order to exploit this vulnerability, the attacker must establish a TCP session with the IM Server service on port 5179. No credentials are required to reach the vulnerable code.


iDefense has confirmed the existence of the vulnerability in version of Ipswitch Inc's IM Server. Previous versions are suspected to be vulnerable.


Employ firewalls, access control lists or other TCP/UDP restriction mechanisms to limit access to systems and services.


Ipswitch has addressed this vulnerability with the 2.07 release of their IM Server. More information can be found at the following URL.


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


04/27/2007 Initial vendor notification
07/17/2007 Initial vendor response
07/23/2007 Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2007 Verisign, Inc.

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