OpenBSD patch: XMM exceptions incorrectly handled in i386 kernel

2009.10.08
Credit: Slava Pestov
Risk: Low
Local: Yes
Remote: No
CVE: CVE-2009-3572
CWE: CWE-Other


CVSS Base Score: 4.9/10
Impact Subscore: 6.9/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Complete

XMM exceptions are incorrectly handled in the OpenBSD/i386 kernel, resulting in a kernel panic that can be triggered by a local user. This issue has been fixed in -current. Source code patches are available for OpenBSD 4.4, 4.5 and 4.6. Patch for OpenBSD 4.6: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.6/i386/002_xmm.patch Patch for OpenBSD 4.5: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/i386/008_xmm.patch Patch for OpenBSD 4.4: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/i386/015_xmm.patch These patches are also available in the OPENBSD_4_6, OPENBSD_4_5 and OPENBSD_4_4 patch branches. Thanks to Slava Pestov for reporting this issue.

References:

http://www.openbsd.org/errata46.html
http://www.openbsd.org/errata45.html
http://www.openbsd.org/errata44.html
http://marc.info/?l=openbsd-security-announce&m=125474331811594
http://www.securityfocus.com/bid/36589
http://secunia.com/advisories/36956


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