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TITLE:
FreeBSD "i386_get_ldt()" Kernel Memory Disclosure Vulnerability

SECUNIA ADVISORY ID:
SA15261

VERIFY ADVISORY:
http://secunia.com/advisories/15261/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

OPERATING SYSTEM:
FreeBSD 4.x
http://secunia.com/product/139/
FreeBSD 5.x
http://secunia.com/product/1132/

DESCRIPTION:
Christer Oberg has reported a vulnerability in FreeBSD, which can be
exploited by malicious, local users to gain knowledge of potentially
sensitive information.

The vulnerability is caused due to an input validation error in the
"i386_get_ldt()" system call and can be exploited to copy arbitrary
portions of data from kernel space into userland by passing negative
or extremely large arguments to the system call.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2005-05-06 02:40:19 UTC (RELENG_5, 5.4-STABLE)
2005-05-06 02:40:49 UTC (RELENG_5_4, 5.4-RELEASE)
2005-05-06 02:40:32 UTC (RELENG_5_3, 5.3-RELEASE-p12)
2005-05-06 02:39:35 UTC (RELENG_4, 4.11-STABLE)
2005-05-06 02:40:05 UTC (RELENG_4_11, 4.11-RELEASE-p6)
2005-05-06 02:39:52 UTC (RELENG_4_10, 4.10-RELEASE-p11)

Patch for FreeBSD 4.x:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch.asc

Patch for FreeBSD 5.x:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch.asc

PROVIDED AND/OR DISCOVERED BY:
Christer Oberg

ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:07.ldt.asc

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