Subfinder on Ubuntu 24.04 LTS
by cloudimg
Passive subdomain enumeration on Ubuntu 24.04 by cloudimg - map your attack surface safely
Subfinder on Ubuntu 24.04 LTS
Subfinder is ProjectDiscovery's fast passive subdomain enumeration tool. It discovers the valid subdomains of a domain by reading public passive sources - certificate-transparency logs, passive-DNS aggregators and web archives - and merges and de-duplicates them into a clean list. Because it is strictly passive it never sends a single packet to the target, so it is safe and non-intrusive to run against any domain you are authorised to assess.
This cloudimg image is a ready-to-run attack-surface-monitoring host, not just the binary:
- Subfinder 2.14.0 installed from the official ProjectDiscovery release and verified against the upstream SHA256 checksum
- A wrapper that makes the system provider-config apply in every context, so optional API keys you add work under cron, systemd and CI, not just your login shell
- A daily timer that passively enumerates the domains you list and writes machine-readable JSONL and plain-text reports with stable symlinks for CI pickup
- Secure by default: no web UI, no listening service, no admin account and no password - SSH on port 22 is the only open port, and no credential is baked into the image
This is a command-line product; drive it over SSH. Licensing is MIT and free - the cloudimg charge covers packaging, security patching, image maintenance and 24/7 expert support.
Recommended size: Standard_B2s. Target users: security engineers and penetration testers mapping the external attack surface of the domains they own or are engaged to test, and automated recon pipelines. Prerequisites: an Azure subscription, a VNet and an SSH key; the NSG should permit port 22 from your admin networks and allow outbound HTTPS.
Deployment guide: https://www.cloudimg.co.uk/guides/subfinder-on-ubuntu-24-04-azure/
24/7 support: support@cloudimg.co.uk