Denial of Service Mitigation. Russell Lahti Director of Technology & Systems, Comlink

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1 Denial of Service Mitigation Russell Lahti Director of Technology & Systems, Comlink

2 Who I Am Russell Lahti Director of Technology & Systems Great Lakes Comnet / Comlink CISSP Research and Development on new platforms and technologies *inux and Windows Systems Administration Develop in Perl, PHP, Python, JS, others VoIP: Hosted PBX, SIP, MGCP, SBC, Proxy Network: Cisco, Juniper, Force10, others. T1-DWDM Figuring things out

3 What is a DoS (Denial of Service) Attack? One basic purpose: Make something or someone go offline Covers a wide variety of attack vectors, but most mainly focus on two approaches 1. Use all available bandwidth 2. Use all of the processing power or memory

4 Common Attack Targets Users of IRC (Internet Relay Chat) Probably still the most common Online message forums and their users Anyone hosting or distributing objectionable content ranging from a picture someone doesn t like to copyright infringing material

5 Less Common Attack Targets The ones you actually hear about Operation Payback Anonymous and Wikileaks DDoS attacks against PayPal, the Swiss bank PostFinance and the Swedish Prosecution Authority. MasterCard and Visa websites taken down Sony PlayStation Network DoS

6 Why Should You Care? Who needs Internet? Can you still operate without it? Many components now rely on the Internet connectivity including BYOB / collapsed network VoIP. Ticket Handling, Credit Card Processing, medical records, and even desktop access.

7 DoS Incredibly Easy Point-and-click tools for common DoS attacks, more available daily DoS attacks for-hire, rent a botnet Little barrier to entry for someone looking to be destructive A single computer can quickly launch a sustained 10Gbps+ DDoS attack

8 Service Providers We commonly see several Gbps of DoS traffic at a time, several times a day Most networks try to police the users Follow the money Who pays? DoS attacks are expensive Even DoS attacks are billable usage Common Solution: Get rid of the problem users

9 PPS: By The Numbers 1Gbps / 84 * 8 = 1,488,095 PPS (64 bytes + 20 byte IG) 1Gbps / 1538 * 8 = 81,275 PPS (1518 bytes + 20 IG) Note: 100GBASE-LR4 - Single CFP Optic Down in price to: $100K each (10KM)

10 PPS: Routers While 1.44M PPS may seem like a lot for a 1Gbps interface, most routers can not sustain even ½ that load Check your router data sheets Other devices: switches, firewalls, in-line IDS, load balancers Test your performance with ACLs applied Don t forget to test endpoints!

11 Large Packet Fill the pipes Difficult to defend against without support from your ISP(s) DDoS: Even harder Larger packets, easier to deal with (processing)

12 Example

13 Layer-7 DoS Eat all available resources, renders content unavailable Many tools available, minimal resources used in attack Emulate real connections, take advantage of default timeouts and partial connections

14 Apache: Options Start by setting config files correctly tweaking StartServers, MinSpareServers, MaxSpareServers, MaxClients, ServerLimit, MaxRequestsPerChild, to meet your platform specs mod_security offers many great options if configured correctly

15 DNS Amplification Attacks Still HUGE Spoofed UDP queries, floods victim Becoming easier to find and attack with Please, don t run an open recursive DNS!

16 Start With Your Network! Know what urpf (Unicast Reverse Path Forwarding) is, and implement it where appropriate Please, don t run an open recursive DNS! mod_security is your friend (once you get to know him) Actively monitor bandwidth, PPS, CPU, MEM, Flows all easily done The obvious: Patch, upgrade, and patch again, it never ends Don t let a system on your network be a member of the next botnet or DDoS attack

17 Mitigating PPS Attacks Check your router spec sheet for PPS, make sure it can handle at least the capacity of your connectivity If conditions are right, null route the target IP both locally, and in coordination with your upstream provider(s) Otherwise, wait for it to end

18 Mitigating Large Packet DoS Similar to PPS attacks, but your router will likely still be responsive Remote Triggered Blackhole Filtering with urpf can work very well against these attacks as long as all bandwidth is not consumed Coordination with your service provider is critical, some have options available

19 Custom Development Monitors packets on SPAN/Mirror port Calculates PPS for all traffic at regular intervals When set interval is reached, targeted IP automatically nullrouted locally and at all upstream network edges, and alerts No DoS traffic hits the uplink, no other customers impacted

20 Future Development Monitoring of passive Netflow/sFlow data Higher data rates and port speeds Threshold setting PPS and signature attacks Merge urpf and BGP Nullroute Functions Web configuration, control, and reporting interface for easier management

21 Questions? Russell Lahti Director of Technology & Systems, Comlink

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