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             AUSCERT External Security Bulletin Redistribution

                ESB-2003.0801 -- OpenBSD Security Advisory
               stack overrun in the kernel's iBCS2 emulation
                             19 November 2003

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                kernel
Publisher:              OpenBSD
Operating System:       OpenBSD
Platform:               IA-32
Impact:                 Execute Arbitrary Code/Commands
                        Increased Privileges
Access Required:        Existing Account

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Georgi Guninski reported a stack overrun due to a missing bounds check 
in the kernel's iBCS2 emulation.  Another similar problem was also fixed 
at the same time.

This issue only affects the i386 architecture.

On OpenBSD 3.3, this may result in arbitray code execution and local user
privilege escalation.

On OpenBSD 3.4, ProPolice catches this, turning a potential privilege
escalation into a denial of service.

Fixes have been committed to the -stable cvs branches, and patches are
also available at
  ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.4/i386/006_ibcs2.patch
and
  ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.3/i386/011_ibcs2.patch


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