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SYNTHESIS OF THE VULNERABILITY

A local attacker can use the kqueue() and kevent() functions on a
malicious file descriptor, in order to stop the system.

Impacted products: NetBSD

Severity: 1/4

Creation date: 27/02/2013

DESCRIPTION OF THE VULNERABILITY

The kqueue() system call requests the kernel to inform the process
when some events occur. The kevent() function is used to alter the
list of events to track, and returns the last events.

When the kqueue() function is called on a file descriptor which
does not support to be monitored, the fnullop_kqfilter() function
does not detect the error. The next call to kevent() then
dereferences a NULL function pointer.

A local attacker can therefore use the kqueue() and kevent()
functions on a malicious file descriptor, in order to stop the
system.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/NetBSD-denial-of-service-via-kqueue-12467