On Tuesday 10 September 2024 at 17:44 UTC, a CLDAP reflection targeted a airline booking customer in the Benelux. The attack peaked at 338.1 Gbps and lasted 107 minutes. Traffic originated from 228 autonomous systems in 72 countries, predominantly hijacked home routers.
| Vector | CLDAP reflection |
| Peak | 338.1 Gbps |
| Duration | 107 min |
| Time to mitigation | 0.053 s |
| Attack traffic reaching origin | 0.041% |
| Legitimate traffic challenged | 0.21% |
Timeline
The attack was preceded by a ransom note demanding payment in Monero. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 33 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Keep origin IPs out of public DNS history.
- Enable authenticated origin pulls.
- Review allow-listed partner ranges quarterly.
Great write-up. We saw almost the same pattern on our login endpoint last month.
Good question. We will cover that in a follow-up post.
Do you publish the edge IP ranges in a machine-readable format?