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TITLE:
FreeBSD SMBFS chroot Directory Traversal Vulnerability

SECUNIA ADVISORY ID:
SA20390

VERIFY ADVISORY:
http://secunia.com/advisories/20390/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
Local system

OPERATING SYSTEM:
FreeBSD 4.x
http://secunia.com/product/139/
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 6.x
http://secunia.com/product/6778/

DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious, local users to bypass certain security restrictions.

The vulnerability is caused due to an input validation error in the
SMBFS mounted file system and can be exploited to bypass chroot
restrictions via the "..\" directory traversal sequence.

SOLUTION:
Update FreeBSD or apply patches.

Fixed versions:
2006-05-31 22:31:21 UTC (RELENG_6, 6.1-STABLE)
2006-05-31 22:31:42 UTC (RELENG_6_1, 6.1-RELEASE-p1)
2006-05-31 22:32:04 UTC (RELENG_6_0, 6.0-RELEASE-p8)
2006-05-31 22:32:22 UTC (RELENG_5, 5.5-STABLE)
2006-05-31 22:32:49 UTC (RELENG_5_5, 5.5-RELEASE-p1)
2006-05-31 22:33:17 UTC (RELENG_5_4, 5.4-RELEASE-p15)
2006-05-31 22:33:41 UTC (RELENG_5_3, 5.3-RELEASE-p30)
2006-05-31 22:34:32 UTC (RELENG_4, 4.11-STABLE)
2006-05-31 22:34:53 UTC (RELENG_4_11, 4.11-RELEASE-p18)
2006-05-31 22:35:32 UTC (RELENG_4_10, 4.10-RELEASE-p24)

Patch for FreeBSD 4.10, 4.11, 5.3, 5.4, 5.5, 6.0, and 6.1:
http://security.FreeBSD.org/patches/SA-06:16/smbfs.patch
http://security.FreeBSD.org/patches/SA-06:16/smbfs.patch.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Mark Moseley.

ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-06:16.smbfs.asc

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


Please Note:
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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