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Code Redux
I don't understand why Symantec classifies a "remote root" exploit as only "medium" damage. Code Red [?] is hitting cable modem networks especially hard, as the new variants scan "nearby" IP's in preference to random ones, which has apparently caused enough damage and network congestion that AT&T's residential broadband division (MediaOne) has cut off port 80 across their network to try and halt the spread of the worm, or so several submitters reported. Newsforge has a story about various reactions to the worm, and reader nettdata sent in an interesting story about the worm becoming the main course at a dinner of security specialists.
You can block incoming and outgoing http connections separately. eg. if a SYN packet is going from an outside address to an inside address, and the port number is 80, block it. But don't block anything else.
6 of our machines at work got infected over the weekend. I was under the impression that our web guy had been keeping them up-to-date, but 5 were inside our NAT (infected by the 1 that was outside). I was under the impression that the ones inside the NAT would be ok. Bad assumption.
The bandwidth it used was so bad that it completely wiped out our ability to get out via HTTP. We could ping, get and send mail, but we couldn't browse at all. I had innoculated my home machine, and it wasn't until this morning, when we received a notice from our ISP accusing of massive port scanning of port 80 that I made the connection. I went around the office and, even after 5 of the 6 machines were innoculated, we still couldn't get out via HTTP. It wasn't until the 6th was innoculated that we could get out.
Our line is a 768/512 DSL (I believe those are the numbers), and it amazes me that a single machine infected could cause so much trouble. This is pretty disturbing.
I ran a test on the 1597 unique hosts that have attempted to infect my web server recently.
321- 20.1% - "Under Construction" default blank page
0- 00.0% - "too busy"
1093- 69.4% - cannot connect
183- 11.4% - some web page
Napster-to-go says "Fill and refill your compatible MP3 player", which is a lie. It's not MP3. It's WMA with DRM.
From: http://help.broadband.att.com/subagreelease.jsp
(b) FTP/HTTP Service Setup. Customer should be aware that when using the Service to access the Internet or any other online network or service, there are certain applications, such as FTP (File Transfer Protocol) server or HTTP (Hyper Text Transfer Protocol) server, which may be used to allow other Service users and Internet users to gain access to Customer's computer. If Customer chooses to run such applications, Customer should take the appropriate security measures. Neither AT&T nor @Home Network shall have any liability whatsoever for any claims, losses, actions, damages, suits or proceedings resulting from, arising out of or otherwise relating to the use of such applications by Customer, including without limitation, damages resulting from others accessing Customer's computer.
And the actual AUP page doesn't mention it at all: http://help.broadband.att.com/faq.jsp?content_id=7 2&category_id=34
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