Understanding DDOS Mitigation by Rishabh Dangwal - www.theprohack.com
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A simple presentation on understanding DDOS and DDOS mitigation solutions.
![DDOS Mitigation
Mitigation : mit·i·ga·tion. /ˌ ɪʃən/ Spelled[mit-i-
mɪtɪˌge
gey-shuhn] noun.
the act of lessening the force or intensity of something
• Understanding DDOS
• Countermeasures
• Mitigation](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Understanding DDOS Mitigation by Rishabh Dangwal - www.theprohack.com
- 1. Understanding DDOS Mitigation Rishabh Dangwal About me : Trivia geek, redbull addict & Independent security enthusiastic, currently employed at Tulip Telecom www.theprohack.com
- 2. DDOS Mitigation Mitigation : mit·i·ga·tion. /ˌ ɪʃən/ Spelled[mit-i- mɪtɪˌge gey-shuhn] noun. the act of lessening the force or intensity of something • Understanding DDOS • Countermeasures • Mitigation
- 3. DOS • Attack that makes a designated service unavailable to the targeted users • Exploits limitations of the system as an inherent universal vulnerability • Limitations : CPU, Memory,Bandwidth
- 4. DDOS • Distributed DOS • A coordinated effort • Botnets are in fashion • Firewalls & IPS are NOT enough • NO 100% solution present , so you can ONLY slow it down
- 5. DDOS Continued .. • Protocol Attacks – exploit protocol vulnerabilities/limitations • Bandwidth Attacks – overflow and consume resources , mostly flood attacks • Software Attacks – exploit network software architecture
- 6. Typical Countermeasures • SYN Proxy • Limiting Number of Connections • Aggressive Aging • Source Rate Limiting • Dynamic Filtering • Active Verification • Anomaly Recognition • Granular Rate limiting • Whitelisting/Blacklisting • Dark Address Prevention
- 7. How DDOS Mitigation solutions work ? • Monitor • Identify • Mitigate
- 8. Monitor • Devices are generally added to monitoring sensors/servers/software via SNMP polling/BGP peering • Traffic thresholds are set • Devices..are monitored • Incase of trouble, alerts are generated
- 9. Identify • Traffic is identified and profiled according to set parameters, configurations and algorithms • Once identified , identify type of attack • Protocol misuse – DNS / ICMP /TCP Null / TCP RST Flood, IP fragment • Bandwidth misuse
- 10. Typical Parameters • Advanced Boolean Match / AS Path Reg exp – by using Regular expressing matching in traffic or on AS Path field of BGP • CIDR – traffic identification using by network prefixes and CIDR blocks • BGP Communities – traffic identification using BGP Communities. • Physical Interfaces – traffic identification by monitoring router’s physical interface through which the traffic is passing. • Peer ASNs & Local ASN/Sub AS – traffic identification by using peer AS numbers field of BGP or by using Local or Sub AS Numbers for the network.
- 11. Mitigate • Traffic diversion • Categorize and “scrubbing” the traffic • Bringing the clean traffic to the cloud
- 12. Traffic diversion • Generate prefix IP address • BGP route injection to predefined router • Divert traffic
- 13. Categorize and scrub traffic • Custom Settings • Traffic Filtering & Malformed DNS packets filtering • DNS Authentication • HTTP request limiting / object limiting • Malformed HTTP & SIP packets filtering • TCP Connection Reset & TCP SYN Authentication • Zombie Removal • Baseline Network Policy Enforcement • Packet shaping • Filter/Allow based on payload • Signature based detection & Mitigation
- 14. Tada .. • Once done, Clean traffic is sent to rightful customers • Attack patterns are jotted down for future reference & threat categorization • More smiles, less caffeine
- 15. Questions ?
- 16. Thank You :] feedback appreciated at admin@theprohack.com