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

See this note in RAW Version

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OpenBSD patch: XMM exceptions incorrectly handled in i386 kernel

References:

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