from http://www.wideopenbsd.org/errata.html
All architectures
005: RELIABILITY FIX: November 4, 2003
It is possible for a local user to cause a system panic by executing
a specially crafted binary with an invalid header.
A source code patch exists which remedies the problem.
reliability ??? ehh ;-P yeah yeah right!
um, that's the wrong errata entry. For 3.4 -
006: SECURITY FIX: November 17, 2003
It may be possible for a local user to overrun the stack in compat_ibcs2(8).
ProPolice catches this, turning a potential privilege escalation into a denial of service. iBCS2 emulation does not need to be enabled via sysctl(8) for this to happen.
A source code patch exists which remedies the problem.
Taken from http://www.openbsd.org/security.html#34