BlackNurse attack PoC
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A simple PoC for the Blacknurse attack.

"Blacknurse is a low bandwidth ICMP attack that is capable of doing denial of service to well known firewalls".

Blacknurse apparently makes the CPU hot on:

  • Cisco ASA 5505, 5506, 5515, 5525 , 5540 (default settings)
  • Cisco 6500 routers with SUP2T and Netflow v9 on the inbound interface - 100% CPU load
  • Cisco ASA 5550 (Legacy) and 5515-X (latest generation)
  • Cisco Router 897 - Can be mitigated
  • SonicWall - Misconfiguration can be changed and mitigated (Enable Anti-DDOS)
  • Palo Alto 5050 Firewalls with firmware 7.1.4-h2
  • Zyxel NWA3560-N (Wireless attack from LAN Side)
  • Zyxel Zywall USG50
  • Fortinet v5.4.1 - One CPU consumed
  • Fortigate units 60c and 100D (even with drop ICMP on)
  • SonicWall
  • Maybe more

See for the full list and updates.

Vendor responses:

This attack is 20+ years old, but it didn't had a logo.