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FreeBSD FPU x87 Register Information Leak
Secunia Advisory:	SA19715	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2006-04-19
Last Update:	2006-04-20
Popularity:	8,135 views

Critical:	Not critical
Impact:	Exposure of sensitive information
Where:	Local system
Solution Status:	Vendor Patch

OS:	FreeBSD 4.x FreeBSD 5.x FreeBSD 6.x

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2006-1056

Description: A security issue has been reported in FreeBSD, which can be exploited by malicious, local users to gain knowledge of potentially sensitive information. The problem is caused due to AMD K7/K8 CPUs only saving/restoring certain x87 registers in FXSAVE instructions when an exception is pending. This may leak x87 register information between processes. Solution: Update to a fixed version or apply patch. Fixed versions: 2006-04-19 07:00:35 UTC (RELENG_6, 6.1-STABLE) 2006-04-19 07:00:50 UTC (RELENG_6_1, 6.1-RELEASE) 2006-04-19 07:01:12 UTC (RELENG_6_0, 6.0-RELEASE-p7) 2006-04-19 07:01:30 UTC (RELENG_5, 5.5-STABLE) 2006-04-19 07:01:53 UTC (RELENG_5_4, 5.4-RELEASE-p14) 2006-04-19 07:02:23 UTC (RELENG_5_3, 5.3-RELEASE-p29) 2006-04-19 07:02:43 UTC (RELENG_4, 4.11-STABLE) 2006-04-19 07:03:01 UTC (RELENG_4_11, 4.11-RELEASE-p17) 2006-04-19 07:03:14 UTC (RELENG_4_10, 4.10-RELEASE-p23) Patch for FreeBSD 4.10 and 4.11: ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:14/fpu4x.patch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:14/fpu4x.patch.asc Patch for FreeBSD 5.3, 5.4, and 6.0: ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:14/fpu.patch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:14/fpu.patch.asc Provided and/or discovered by: The vendor credits Jan Beulich. Changelog: 2006-04-20: Added link to AMD response on freebsd.org web site. Original Advisory: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:14.fpu.asc ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:14-amd.txt

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