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Secunia Security Advisory 36353

Secunia Security Advisory 36353
Posted Aug 28, 2009
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Kingcope has discovered a security issue in FreeBSD's ftpd, which can be exploited by malicious users to bypass certain security restrictions.

tags | advisory
systems | freebsd
MD5 | aee12a067dce87a631a0c959dd8fd4ae

Secunia Security Advisory 36353

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TITLE:
FreeBSD ftpd chroot Security Bypass Security Issue

SECUNIA ADVISORY ID:
SA36353

VERIFY ADVISORY:
http://secunia.com/advisories/36353/

DESCRIPTION:
Kingcope has discovered a security issue in FreeBSD's ftpd, which can
be exploited by malicious users to bypass certain security
restrictions.

The security issue is caused due to the ftpd not correctly checking
for certain error conditions when trying to read a user's chroot
information from /etc/ftpchroot. A user can exploit this to bypass
the chroot protection by e.g. uploading ".login_conf" and
".login_conf.db" files with the "openfiles" resource limit set to 5
into a home directory.

The security issue is confirmed in FreeBSD 7.2. Other versions may
also be affected.

SOLUTION:
Allow access to trusted users only. Do not rely on the chroot
protection.

PROVIDED AND/OR DISCOVERED BY:
Kingcope

ORIGINAL ADVISORY:
http://packetstormsecurity.org/0908-exploits/bsd-setusercontext.txt

----------------------------------------------------------------------

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

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
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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