Common attacks and weaknesses
- CVE-2020-11651/11652 allowed unauthenticated command execution on every managed minion.
Port 4505: SaltStack
Salt master publish port (4506 for returns).
4505
How SaltStack works
DevOps, cloud & containersCommands sent to port 4505 create and control containers or cluster resources on the host. Everything is encrypted: someone on the path only sees unreadable bytes.
- Transport
- TCP
- Exposure risk
- 9/10 critical if reachable from the Internet
- Encryption
- EncryptedTLS or built-in crypto
- IANA status
- Unassignedcommon use differs from the registry
- Range
- Registered (1024-49151)
- Category
- DevOps, cloud & containers
Is port 4505 dangerous?
How to secure it
- Never expose the Salt master to the Internet and keep it patched.
Unofficial use. The IANA assignment below differs from what is usually found on this port in practice.
IANA registry entries for port 4505
No entry. The port is free for any application, so check what uses it on your hosts.
// source: IANA service name and port number registry
Which program uses port 4505, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4505' # process listening on 4505
sudo lsof -nP -i :4505macOS
sudo lsof -nP -i :4505
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4505 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4505 netstat -ano | findstr :4505
From another machine
nmap -p 4505 -sV <host> nc -zv <host> 4505
Block it in the firewall
sudo ufw deny 4505/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4505" -Direction Inbound -LocalPort 4505 -Protocol TCP -Action Block # Windows
What is port 4505 used for?
Salt master publish port (4506 for returns).
Is port 4505 TCP or UDP?
Port 4505 is registered for TCP.
Is it safe to open port 4505?
It is rated 9/10 (critical) when exposed to the Internet. CVE-2020-11651/11652 allowed unauthenticated command execution on every managed minion. Never expose the Salt master to the Internet and keep it patched.
How do I check if port 4505 is open?
On Linux run "ss -ltnup 'sport = :4505'", on macOS "lsof -nP -i :4505", and on Windows "netstat -ano | findstr :4505" to see the local process. From another machine, "nmap -p 4505 <host>" shows whether it is reachable.
Other devops, cloud & containers ports
:2375 Docker API (HTTP) tcp · critical risk :2376 Docker API (TLS) tcp · high risk :6443 Kubernetes API tcp · udp · high risk :10250 Kubelet API tcp · critical risk :2379 etcd tcp · critical risk :8500 Consul tcp · udp · high risk :9000 PHP-FPM / SonarQube / Portainer tcp · udp · high risk :677 Virtual Presence Protocol tcp · udp