Vigil@nce - F-Secure Anti-Virus: privilege escalation via FSGK.SYS
November 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can use the FSGK.SYS driver of F-Secure Anti-Virus, in order to escalate his privileges.
Impacted products: F-Secure AV.
Creation date: 02/09/2015.
DESCRIPTION OF THE VULNERABILITY
The F-Secure Anti-Virus product installs the Gatekeeper (FSGK.SYS) driver.
However, this driver does not use the FILE_DEVICE_SECURE_OPEN flag, so a local attacker can manipulate the kernel memory allocation.
A local attacker can therefore use the FSGK.SYS driver of F-Secure Anti-Virus, in order to escalate his privileges.
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