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TITLE:
Snort TCP SACK Option Handling Denial of Service

SECUNIA ADVISORY ID:
SA16786

VERIFY ADVISORY:
http://secunia.com/advisories/16786/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Snort 2.4.x
http://secunia.com/product/5691/

DESCRIPTION:
Alejandro Hernandez Hernandez has reported a vulnerability in Snort,
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
in the "PrintTcpOptions()" function located in snort-2.4.0/src/log.c.
This can be exploited to cause Snort to crash via a TCP/IP packet
containing a malformed TCP SACK option.

Successful exploitation requires that Snort is configured to run in
verbose mode (using the switch -v).

The vulnerability has been reported in version 2.4.0. Prior versions
may also be affected.

SOLUTION:
The vulnerability has been fixed in the CVS repositories, and will be
included in version 2.4.1.

PROVIDED AND/OR DISCOVERED BY:
Alejandro Hernandez Hernandez

ORIGINAL ADVISORY:
Snort.org:
http://www.snort.org/pub-bin/snortnews.cgi#58

Vulnfact Research Group:
http://www.vulnfact.com/advisories/snort_adv.html

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About:
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everybody keeping their systems up to date against the latest
vulnerabilities.

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