full-disclosure - silc-server 1.0.2 denial-of-service vulnerability

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Date: Tue, 6 Mar 2007 18:48:08 +0100
From: Alexander Heidenreich <a.heidenreich@...cksec.de>
To: full-disclosure@...ts.grok.org.uk
Subject: silc-server 1.0.2 denial-of-service vulnerability

Hi,

there is a bug in the current version of silc-server that makes it
possible to crash a networks SILC router or a standalone server, when a
new channel is created. All it takes is to specify an invalid hmac
algorithm name and no cipher algorithm name. This results in an null
pointer dereference in 'SILC_SERVER_CMD_FUNC(join)' at line 2444 in
apps/silcd/command.c.

To reproduce:

/connect yourserver
/join nonexistent -hmac nonexistent

The attached patch fixes the problem.

Best regards,
Frank Benkstein

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View attachment "silc-join-hmac.patch" of type "text/x-diff" (2882 bytes)

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