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We specialize in advanced defense and intelligent monitoring to protect your digital assets and operations.
Exposing overlooked weaknesses at the edge of your network.
Munich, Germany - September 19, 2025
DNS and TLS are foundational components of internet-facing infrastructure. They are often considered “set-and-forget” systems, yet Rasotec's external penetration tests frequently uncover misconfigurations that quietly erode perimeter security. These issues rarely trigger alerts, but they expose organizations to domain hijacking, man-in-the-middle attacks, and data compromise.
DNS misconfigurations are especially common. Rasotec often identifies dangling DNS records that point to decommissioned cloud resources, allowing attackers to claim them and serve malicious content under trusted subdomains. Missing DNSSEC signatures enable spoofing and cache poisoning, while permissive zone transfers expose internal infrastructure mappings to anyone who requests them.
Misconfigured MX records are another overlooked risk. Weak or inconsistent SPF, DKIM, and DMARC policies allow attackers to spoof email from the organization's domain. This undermines trust and creates an ideal entry point for phishing, which remains one of the most effective initial access vectors in real attacks.
TLS misconfigurations are equally widespread. Rasotec often encounters expired or mismatched certificates, weak cipher suites, and missing HTTP Strict Transport Security (HSTS) headers. These issues can allow downgrade attacks, session hijacking, or interception of supposedly secure traffic, especially on shared or load-balanced infrastructure.
"Perimeter defenses mean little if your trust anchors are broken. DNS and TLS misconfigurations silently erode security from the outside in," said Rick Graßmann, Chief Executive Officer at Rasotec.
Even organizations with strong internal security often overlook TLS certificate sprawl. Old test environments, forgotten subdomains, and third-party integrations may use outdated certificates or self-signed roots. Attackers exploit these as weak links to bypass trust chains or impersonate internal systems from the outside.
These configuration gaps are rarely visible in automated vulnerability scans. They require a holistic view of the organization's external footprint, including DNS inventory analysis, certificate lifecycle auditing, and manual verification of edge security policies. Rasotec's external pentests emphasize this perimeter mapping as a critical first step.
Attackers target the path of least resistance. If DNS and TLS controls are weak, they bypass more complex defenses entirely. Hardened endpoints and patched servers offer little protection if attackers can intercept traffic or impersonate trusted domains at the perimeter.
Rasotec's penetration tests simulate these attacker techniques to expose misconfigurations before they are exploited. Securing DNS and TLS foundations close silent but critical gaps in organizations' external security posture.
About Rasotec: Rasotec is one of CypSec's closest partners and a boutique security firm specializing in manual penetration testing of complex web, mobile, and infrastructure environments. Its team focuses on uncovering logic flaws, chained attack paths, and high-impact vulnerabilities that automated tools miss. For more information, visit rasotec.com.
Media Contact: Rick Graßmann, Chief Executive Officer at Rasotec - rick.grassmann@rasotec.com.
We specialize in advanced defense and intelligent monitoring to protect your digital assets and operations.
