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[SA12722] FreeBSD syscons Kernel Memory Disclosure Vulnerability
From: Secunia Security Advisories (sec-adv
secunia.com)
Date: Tue Oct 05 2004 - 07:35:51 CDT
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TITLE:
FreeBSD syscons Kernel Memory Disclosure Vulnerability
SECUNIA ADVISORY ID:
SA12722
VERIFY ADVISORY:
http://secunia.com/advisories/12722/
CRITICAL:
Less critical
IMPACT:
Exposure of system information, Exposure of sensitive information
WHERE:
Local system
OPERATING SYSTEM:
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 sensitive
information.
The vulnerability is caused due to an input validation error in the
"CONS_SCRSHOT" ioctl and can be exploited to disclose parts of kernel
memory by supplying a specially crafted argument.
Successful exploitation requires access to the physical console or
that a "/dev/ttyv*" device node can be opened.
SOLUTION:
Update to a fixed version or apply patches.
The vulnerability has been fixed in the following versions:
* 2004-09-30 17:49:15 UTC (RELENG_5, 5.3-BETA6)
* 2004-10-04 17:04:25 UTC (RELENG_5_2, 5.2.1-RELEASE-p11)
Patch for FreeBSD 5.2:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:15/syscons.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:15/syscons.patch.asc
PROVIDED AND/OR DISCOVERED BY:
Christer Oberg
ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04%3A15.syscons.asc
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