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Vigil@nce: IP Filter, ISA, DNS vulnerability with NAT

November 2008 by Vigil@nce

SYNTHESIS

When the address translation is enabled on the firewall, protections which are setup to correct VIGILANCE-VUL-7937 are not efficient.

Gravity: 2/4

Consequences: data creation/edition

Provenance: internet server

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 12/11/2008

IMPACTED PRODUCTS

- Microsoft ISA
- OpenSolaris
- Sun Solaris
- Unix - plateform

DESCRIPTION

The solution for the VIGILANCE-VUL-7937 (DNS poisoning) vulnerability requires to use random port numbers.

However, when the DNS server is protected by a firewall with address translation, the DNS server is still vulnerable if the firewall uses predictable port numbers.

Two firewalls cause this regression:
- IP Filter
- Microsoft ISA Server

CHARACTERISTICS

Identifiers: 245206, 6726575, 6730614, VIGILANCE-VUL-8237

http://vigilance.fr/vulnerability/8237




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