[action] [PR:139] Fix security vulnerability in caclmgrd (#139) #141
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- description: After installation, a default iptables rule allows an attacker to bypass all others rules protecting the switch management & control-plane. - Mitigation: Accept only ttl-lt 2 for ICMP packets, or possibly dst-port > 1024. Traceroute may be based on ICMP or UDP or TCP. For ICMP: accept all icmp protocol TTL < 2 packets For UDP: accept UDP protocol TTL < 2 and UDP dest port > 1024 packets For TCP: accept TCP protocol TTL < 2 and TCP dest port > 1024 packets For other mismatched packets, default action is drop - work item: 28662516
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Original PR: #139 |
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After installation, a default iptables rule allows an attacker to bypass all others rules protecting the switch management & control-plane.
Accept only ttl-lt 2 for ICMP packets, or possibly dst-port > 1024.
Traceroute may be based on ICMP or UDP or TCP.
For ICMP: accept all icmp protocol TTL < 2 packets
For UDP: accept UDP protocol TTL < 2 and UDP dest port > 1024 packets
For TCP: accept TCP protocol TTL < 2 and TCP dest port > 1024 packets
For other mismatched packets, default action is drop
28662516