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