nanog mailing list archives
RE: Yahoo offline because of attack (was: Yahoo network outage)
From: Deepak Jain <deepak () ai net>
Date: Wed, 9 Feb 2000 12:34:12 -0500 (EST)
If we assume that the attacks are being lead by competent attackers, we must also assume that their motive could be more complex than just "hah hah, let's see if we can make Yahoo disappear." In fact, it could be far more interesting than just a technical display of capabilities. In light of Yahoo, Exodus and UUNET's issues over the last three days, anyone who doesn't consider this a mandate to improve the accountability of net-connected sites is seriously missing the boat. Just my opinion, Deepak Jain AiNET On Wed, 9 Feb 2000, Roeland M.J. Meyer wrote:
From: owner-nanog () merit edu [mailto:owner-nanog () merit edu]On Behalf Of Shawn McMahon Sent: Wednesday, February 09, 2000 8:01 AM At 03:11 AM 2/9/2000 -0800, you wrote:50 systems across the internet with enough CPU capacity to near-fill a T-1 on a sustained basis with identical HTTP requests. Which is to say any modern multi-hundred-mhz RISC or x86 box with a reasonable OS, not really "largish".Multi-hundred-mhz, nothing; a 486/33 can do that. 50 cast-off 486 motherboards with $50 AMD 5x86 processors could saturate those T1s and still get good GUI response. 50 Pentium IIs could do that, running even Windows 95, and probably have enough CPU left to get good RC5 cracking rates. :-) I think we're leaping to majorly unwarranted conclusions here.A simple case of denial here, T1's are not cheap. It isn't the CPU horsepower that is significant here. It is the access to the required bandwidth that makes this so worrisome. In order to operate stealth-mode in a system, one must be on a box that has sufficient power such that the operation of your code consumes less than 3% of the box's available capacity. In addition, your network should consume less than 5% of the site's pipe, even during an attack. Remember, it appears that these hosts have been compromised for some time. Further, Sean indicates that the entire attack system was tested at least once and no one noticed. These guys have to be frugal with the assets if they want to contnue using them undetected. This indicates planning and discipline. These are NOT ignorant cracker-kiddies. This indicates one or two compromised hosts per site with 50-ish sites penetrated, at minimum (probably, 100's). I would wager that even the 50-ish sites actually used in the attacks had no idea that they were participating. This indicates low resource usage on part of the attacking code, since the first indicator SA's usually look for is abnormally high usage of resources. Let's quit assuming that all other operators are incompetent and start assuming the worst, that crackers got this one by "competent" SAs, shall we? If this is the case, then any of us are vulnerable. I find it difficult to believe that there are 50 sites, with T3 connectivity or better, that are all staffed exclusively by incompetent operators, let alone 100's or 1000's.
Current thread:
- Re: Yahoo offline because of attack (was: Yahoo network outage), (continued)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Richard Steenbergen (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Simon Lyall (Feb 11)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Troy Davis (Feb 11)
- Re: Yahoo offline because of attack (was: Yahoo network outage) George Herbert (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Charles Sprickman (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Richard Steenbergen (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Charley Kline (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Barry Shein (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Charles Sprickman (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Shawn McMahon (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Roeland M.J. Meyer (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Deepak Jain (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Roeland M.J. Meyer (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Deepak Jain (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Patrick Greenwell (Feb 09)
- Message not available
- RE: Yahoo offline because of attack (was: Yahoo network outage) Shawn McMahon (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) James Smith (Feb 09)
- RE: Yahoo offline because of attack (was: Yahoo network outage) Patrick Greenwell (Feb 09)
- Message not available
- RE: Yahoo offline because of attack (was: Yahoo network outage) Declan McCullagh (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Richard Steenbergen (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) lucifer (Feb 09)
- Re: Yahoo offline because of attack (was: Yahoo network outage) Dan Hollis (Feb 09)