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Background for this topic.
Firewalls are security controls that permit or block network connections according to policy. They can operate at network boundaries, between internal segments, on individual hosts, or in cloud environments. Basic rules use addresses, ports, protocols, and connection state; more advanced firewalls may inspect applications or encrypted traffic where configured. Their purpose is to limit which systems can communicate, not to determine that all permitted traffic is safe.
Security depends heavily on accurate policy and maintenance. Overly broad, obsolete, or conflicting rules can expose services or allow unnecessary lateral movement, while unmanaged administrative interfaces and unpatched firewall software create additional attack surfaces. Practitioners should restrict management access, apply least-privilege rules, review and remove exceptions, and monitor logs for unexpected connections and policy changes. Firewall logs can support investigation, but encryption, evasion, and traffic allowed by policy may limit what the control can detect.
Volt Typhoon, APT31, APT41 Targeted Sophos Edge DevicesFirewall maker Sophos disclosed Thursday a half-decade worth of efforts by multiple nation-state Chinese hacking groups to infiltrate its appliances, calling the admission a wake-up call for the cybersecurity industry. Targeting firewall appliances is a known nation state tactic as hackers
Fog and Akira ransomware operators have increased their exploitation efforts of CVE-2024-40766, a critical access control flaw that allows unauthorized access to resources on the SSL VPN feature of SonicWall SonicOS firewalls. [...]