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TITLE:
SILC Server Invalid hmac/cipher Denial of Service

SECUNIA ADVISORY ID:
SA24431

VERIFY ADVISORY:
http://secunia.com/advisories/24431/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
SILC Secure Internet Live Conferencing Server 1.x
http://secunia.com/product/1029/

DESCRIPTION:
Frank Benkstein has reported a vulnerability in SILC Server, which
can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to a NULL-pointer dereference error
within apps/silcd/command.c. This can be exploited to crash the
service by connecting to the server, joining or creating a channel,
and then specifying invalid hmac or cipher values.

The vulnerability is reported in version 1.02. Prior versions may
also be affected.

SOLUTION:
Update to version 1.03.

PROVIDED AND/OR DISCOVERED BY:
Frank Benkstein

ORIGINAL ADVISORY:
SILC Project:
http://silcnet.org/general/news/?item=server_20070306_1

Full-Disclosure:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-March/052804.html

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About:
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