TITLE:
Kerio Personal/Server Firewall FWDRV Driver Denial of Service

SECUNIA ADVISORY ID:
SA17155

VERIFY ADVISORY:
http://secunia.com/advisories/17155/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

SOFTWARE:
Kerio ServerFirewall 1.x
http://secunia.com/product/4378/
Kerio Personal Firewall 4.x
http://secunia.com/product/2654/
Kerio Personal Firewall 3.x
http://secunia.com/product/2653/
Kerio Personal Firewall 2.x
http://secunia.com/product/1493/

DESCRIPTION:
Piotr Bania has reported a weakness in Kerio Personal/ServerFirewall,
which can be exploited by malicious, local users to cause a DoS
(Denial of Service).

The weakness is caused due to missing validation checks in the FWDRV
driver before reading the PEB (Process Environment Block) of a
process. This can be exploited to crash the system via a malicious
application that locks the memory page where its PEB resides before
connecting to the network.

The weakness has been reported in versions:
* Kerio Personal Firewall version 4.2.0 and prior.
* Kerio ServerFirewall version 1.1.1 and prior.

SOLUTION:
Kerio Personal Firewall:
Update to version 4.2.1 or later.

Kerio ServerFirewall:
Update to version 1.1.2 or later.

PROVIDED AND/OR DISCOVERED BY:
Piotr Bania

ORIGINAL ADVISORY:
Kerio:
http://www.kerio.com/security_advisory.html

Piotr Bania:
http://pb.specialised.info/all/adv/kerio-fwdrv-dos-adv.txt

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