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             AUSCERT External Security Bulletin Redistribution

                        ESB-2007.0003 -- [OpenBSD]
      VGA driver may allow local privilege escalation via agp_ioctl()
                              4 January 2007


        AusCERT Security Bulletin Summary

Product:              vga(4)
Publisher:            OpenBSD
Operating System:     OpenBSD 4.0 and prior
Platform:             IA-32
Impact:               Root Compromise
Access:               Existing Account

Original Bulletin:    http://openbsd.org/errata.html#agp

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007: SECURITY FIX: January 3, 2007   i386 only

Insufficient validation in vga(4) may allow an attacker to gain root
privileges if the kernel is compiled with option PCIAGP and the actual
device is not an AGP device. The PCIAGP option is present by default on
i386 kernels only. This vulnerability has been discovered by Ilja van

A patch addressing this problem is available in the -STABLE branches for
OpenBSD 3.9 and OpenBSD 4.0. Standalone patch files are also available:

- - for OpenBSD 4.0:

- - for OpenBSD 3.9:

For more information about OpenBSD errata and how to apply them, please
refer to FAQ 10.15: http://www.OpenBSD.org/faq/faq10.html#Patches

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