----------------------------------------------------------------------

Want a new job?
http://secunia.com/secunia_vacancies/

Secunia is looking for new researchers with a reversing background
and experience in writing exploit code:
http://secunia.com/hardcore_disassembler_and_reverse_engineer/
http://secunia.com/Disassembling_og_Reversing/

----------------------------------------------------------------------

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

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------