The Kerio Firewall driver contains a flaw that may allow a local denial of service. The issue is triggered when Kerio is reading the PEB (Process Environment Block) of applications that are trying to connect to the internet. If the application has the PEB region locked, the Kerio Firewall driver will crash resulting in a loss of availability for the program.
Classification
Location:
Local Access Required
Attack Type:
Denial of Service
Impact:
Loss of Availability
Exploit:
Exploit Unavailable
Solution
Upgrade to Kerio Personal Firewall version 4.2.1 or Kerio ServerFirewall 1.1.2 or higher as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.