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

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