CyberHunter
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// DevOps, cloud & containers

Port 4505: SaltStack

Salt master publish port (4506 for returns).

Salt master (4505-4506)
4505

How SaltStack works

DevOps, cloud & containers
adminhostsalt '*' cmd adminhostsalt '*' cmd

Commands 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
01 Security

Is port 4505 dangerous?

Common attacks and weaknesses

  • CVE-2020-11651/11652 allowed unauthenticated command execution on every managed minion.

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.

02 Registry

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

03 Check it

Which program uses port 4505, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4505'      # process listening on 4505
sudo lsof -nP -i :4505

macOS

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
04 FAQ
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.

05 Related
: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

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