Cisco warns of large-scale brute-force attacks against VPN and SSH services

Pierluigi Paganini April 17, 2024

Cisco Talos warns of large-scale brute-force attacks against a variety of targets, including VPN services, web application authentication interfaces and SSH services.  

Cisco Talos researchers warn of large-scale credential brute-force attacks targeting multiple targets, including Virtual Private Network (VPN) services, web application authentication interfaces and SSH services since at least March 18, 2024.  

Below is a list of known affected services: 

  • Cisco Secure Firewall VPN 
  • Checkpoint VPN  
  • Fortinet VPN  
  • SonicWall VPN  
  • RD Web Services 
  • Miktrotik 
  • Draytek 
  • Ubiquiti 

Successful brute-force attacks can result in unauthorized network access, account lockouts, or denial-of-service (DoS) conditions.

These attacks originate from TOR exit nodes and anonymizing tunnels and proxies, such as:  

  • VPN Gate  
  • IPIDEA Proxy  
  • BigMama Proxy  
  • Space Proxies  
  • Nexus Proxy  
  • Proxy Rack 

“The brute-forcing attempts use generic usernames and valid usernames for specific organizations. The targeting of these attacks appears to be indiscriminate and not directed at a particular region or industry.” reads the advisory published by Cisco Talos.

The malicious activity lacks a specific focus on particular industries or regions, suggesting a broader strategy of random, opportunistic attacks.

The advisory published by Talos includes a list of indicators of compromise (IoCs) for this campaign.

Pierluigi Paganini

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

(SecurityAffairs – hacking, brute-force)

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