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DoS attack reveals (yet another) crack in net's core




DoS attack reveals (yet another) crack in net's core
DoS attack reveals (yet another) crack in net's core



http://www.theregister.co.uk/2008/10/01/fundamental_net_vuln/ 

By Dan Goodin in San Francisco 
The Register
1st October 2008

Security experts say they have discovered a flaw in a core internet 
protocol that can be exploited to disrupt just about any device with a 
broadband connection, a finding that could have profound consequences 
for millions of people who depend on websites, mail servers, and network 
infrastructure.

The bug in the transmission control protocol (TCP) affords attackers a 
wealth of new ways to carry out denials of service on equipment at the 
heart of data centers and other sensitive points on the internet. The 
new class of attack is especially severe because it can be carried out 
using very little bandwidth and has the ability to paralyze a server or 
router even after the flood of malicious data has stopped.

"If you use the internet and you serve a TCP-based service that you 
value the availability for, then this affects you," Robert E. Lee, chief 
security officer for Sweden-based Outpost24 told The Register. "That may 
not be every internet user, but that's certainly any IT manager, that's 
certainly any website operator, mail server operator, or router 
operator."

Lee said he and Outpost24 colleague Jack Louis discovered the bug in 
2005, but decided to keep their finding secret while they tried to 
devise a solution. After largely hitting a wall, they decided to go 
public in hopes that a new infusion of ideas will finally get the 
problem fixed.

[...]


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