Firewall Software Cause Problems for DNS Patch

Kara Reeder

Firewall vendors like Cisco, Juniper and Citrix are scrambling to fix a problem that can undo a feature that was introduced in the DNS patches, according to InfoWorld.

 

Firewall software that uses Internet Protocol address translation has the potential to undo the source port randomization, which would allow attackers to pull off a cache-poisoning attack against the DNS server.

 

A fix is still weeks away. In the meantime, Dan Kaminsky, the researcher that discovered the flaw, suggests that network administrators forward their DNS lookups to servers that are not translating port addresses or reconfigure the firewall.



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