[SA19869] Linux Kernel SMBFS chroot Directory Traversal Vulnerability

TITLE:
Linux Kernel SMBFS chroot Directory Traversal Vulnerability

SECUNIA ADVISORY ID:
SA19869

VERIFY ADVISORY:
http://secunia.com/advisories/19869/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Marcel Holtmann has reported a vulnerability in the Linux Kernel,
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 filesystem. This can be exploited to bypass chroot
restrictions via the "…\\" directory traversal sequences.

SOLUTION:
Restrict access to affected systems.

Secunia is currently not aware of an official version addressing
this.

PROVIDED AND/OR DISCOVERED BY:
Marcel Holtmann

ORIGINAL ADVISORY:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189435

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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