[EXPL] psyBNC Vulnerable to a DoS Attack (Exploit)
From: support@securiteam.comDate: 04/23/02
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From: support@securiteam.com To: list@securiteam.com Date: Tue, 23 Apr 2002 21:16:58 +0200 (CEST)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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psyBNC Vulnerable to a DoS Attack (Exploit)
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SUMMARY
<http://www.psychoid.lam3rz.de/> psyBNC has a problem dealing with
oversized passwords, making it possible to tie up all the connection slots
and consume a lot of CPU on the server.
DETAILS
Vulnerable systems:
psyBNC versions prior to 2.3 (without the patch)
Immune systems:
psyBNC version 2.3 and above
Exploit:
Create a program to do the following:
1. Connect to the psyBNC daemon
2. Send "irc registration" information, e.g.:
user a b c d [LF/0x10]
nick abcd [LF/0x10]
3. Send an oversized password (about 9000++ bytes):
PASS < oversized password > [LF/0x10]
4. Kill the connection
This will make psyBNC slowly consume more and more CPU.
ADDITIONAL INFORMATION
The information has been provided by <mailto:nawok@nawok.org> nawok and
<mailto:psychoid@rewtbox.de> psychoid.
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