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FreeBSD FPU x87 Register Information Leak
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Secunia Advisory:
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SA19715
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Release Date:
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2006-04-19
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Last Update:
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2006-04-20
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Critical:
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Not critical
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Impact:
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Exposure of sensitive information
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| OS: | FreeBSD 4.x
FreeBSD 5.x
FreeBSD 6.x
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| | CVE reference: | CVE-2006-1056 (Secunia mirror)
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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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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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