Tried, Tested and Proven

Security Advisory 07-008 – Denial of service due to format string vulnerability in DCC file transfer

Vulnerability discovery and development:

Portcullis Security Testing Services

Credit for Discovery:

Nico Leidecker of Portcullis Computer Security Ltd discovered this vulnerability. Further research was then carried out.

Affected Systems:

Version 0.3.151 was tested to be vulnerable.

Details:

HydraIRC is an IRC client supporting DCC file transfers. The client is prone to a format string vulnerability as it passes user input to a function expecting a format string. This only occurs, when the DCC file transfer negotiation fails.

Impact:

By sending a special crafted DCC file transfer request to the victim, an attacker is then able to conduct a Denial of Service attack against them.

Exploit:

Proof of concept exploit code is available.

Vendor Status:

The vendor has been informed and the vulnerability has been fixed.

Copyright:

Copyright © Portcullis Computer Security Limited 2007, All rights reserved worldwide.
Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited.

Disclaimer:

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