TITLE:
Debian Network Installation Insecure Default Directory Permissions

SECUNIA ADVISORY ID:
SA19331

VERIFY ADVISORY:
http://secunia.com/advisories/19331/

CRITICAL:
Not critical

IMPACT:
Security Bypass, DoS

WHERE:
Local system

OPERATING SYSTEM:
Debian GNU/Linux 3.1
http://secunia.com/product/5307/

DESCRIPTION:
Ferenczi Viktor has discovered a weakness in Debian, which can be
exploited by malicious, local users to bypass certain security
restrictions and potentially cause a DoS (Denial of Service).

The weakness is caused due to the
"/var/log/debian-installer/cdebconf" directory being left behind with
world-writable permissions after completion of installation using the
network install CD. This can potentially be exploited by malicious
users to cause a DoS by e.g. filling up the /var/log partition.

The vulnerability has been confirmed in debian-31r1a-i386-netinst.iso
and also reported in version 3.1r1. Other versions may also be
affected.

SOLUTION:
Configure appropriate permissions for the
"/var/log/debian-installer/cdebconf" directory.

PROVIDED AND/OR DISCOVERED BY:
Ferenczi Viktor

ORIGINAL ADVISORY:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=358210

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

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/secunia_security_advisories/

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

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

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

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