ZDNet: News: Personal firewalls: Not so safe? many of these personal firewalls have a design that's
easy to compromise with just a few lines of code,
according to several sources. In fact, to prove the point, one
source sent code to eWeek with the claim that it
compromised Sygate Technologies Inc.'s Personal
Firewall. But the source said it would work on Symantec
Corp.'s Norton Personal Firewall and others, as well.
eWeek Labs tested the code and confirmed that it will open
a back door in several personal firewalls.
http://www.zdnet.com/zdnn/stories/news/0,4586,2663028,00.html