TITLE:
FreeBSD Kernel Memory Disclosure Vulnerabilities

SECUNIA ADVISORY ID:
SA18599

VERIFY ADVISORY:
http://secunia.com/advisories/18599/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

OPERATING SYSTEM:
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 6.x
http://secunia.com/product/6778/

DESCRIPTION:
Two vulnerabilities have been reported in FreeBSD, which can be
exploited to malicious, local users to gain knowledge of potentially
sensitive information.

1) An error in the ioctl mechanism causes uninitalised kernel stack
memory to be copied to user-space buffers. This discloses kernel
memory content, which may contain sensitive information such as
passwords.

2) An error in the ioctl mechanism when calculating buffer sizes can
cause too much data to be copied into user-space buffers and
discloses kernel memory content.

The vulnerabilities have been reported in version 5.4-STABLE and 6.0.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2006-01-25 10:00:59 UTC (RELENG_6, 6.0-STABLE)
2006-01-25 10:01:26 UTC (RELENG_6_0, 6.0-RELEASE-p4)
2006-01-25 10:01:47 UTC (RELENG_5, 5.4-STABLE)

Patch for FreeBSD 5.4-STABLE and 6.0-STABLE:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem.patch.asc

Patch for FreeBSD 6.0-RELEASE:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem60.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem60.patch.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Xin LI and Karl Janmar.

ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:06.kmem.asc

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