From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Dec 02 2004 - 06:37:28 CST

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TITLE:
FreeBSD procfs/linprocfs Process Argument Vector Handling
Vulnerability

SECUNIA ADVISORY ID:
SA13352

VERIFY ADVISORY:
http://secunia.com/advisories/13352/

CRITICAL:
Less critical

IMPACT:
Exposure of system information, Exposure of sensitive information,
DoS

WHERE:
Local system

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

DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious, local users to gain knowledge of sensitive information
or cause a DoS (Denial of Service).

The vulnerability is caused due to an error in
"/proc/curproc/cmdline" of the procfs file system and
"/proc/self/cmdline" of the linprocfs file system when reading an
argument vector from a process address space. This can be exploited
to disclose parts of kernel memory or crash a vulnerable system.

Successful exploitation requires that the procfs or linprocfs file
system is mounted.

NOTE: "/proc/self/cmdline" is not implemented in FreeBSD 4.x.

SOLUTION:
Update to a fixed version or apply patches.

The vulnerability has been fixed in the following versions:
* 2004-12-01 21:33:35 UTC (RELENG_5, 5.3-STABLE)
* 2004-12-01 21:34:23 UTC (RELENG_5_3, 5.3-RELEASE-p2)
* 2004-12-01 21:34:43 UTC (RELENG_5_2, 5.2.1-RELEASE-p13)
* 2004-12-01 21:33:57 UTC (RELENG_4, 4.10-STABLE)
* 2004-12-01 21:35:10 UTC (RELENG_4_10, 4.10-RELEASE-p5)
* 2004-12-01 21:35:57 UTC (RELENG_4_8, 4.8-RELEASE-p27)

Patch for FreeBSD 4.8 and 4.10:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:17/procfs4.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:17/procfs4.patch.asc

Patch for FreeBSD 5.2 and 5.3:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:17/procfs5.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:17/procfs5.patch.asc

PROVIDED AND/OR DISCOVERED BY:
Bryan Fulton and Ted Unangst.

ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04%3A17.procfs.asc

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About:
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