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Die fünf schlimmsten Dinge, die Angreifer in Ihren verschlüsselten Tunneln anrichten können
Von Nick Hunter
Analysten schätzen, dass bei über der Hälfte aller Netzwerkangriffe Verschlüsselung im Spiel ist. Mithilfe gefälschter oder kompromittierter Schlüssel und Zertifikate richten Angreifer bösartige Tunnel in Ihr Netzwerk ein, in denen sie sich verbergen, während sie Erkundungen durchführen, Malware installieren und schließlich wertvolle Daten entwenden. Angriffe dieser Art sind besonders hinterhältig, weil durch die bösartigen Tunnel alltägliche Geschäftskommunikation zu laufen scheint. Es sei denn, man sieht genauer hin – aber mal ehrlich: Wie viele Unternehmen überprüfen schon 100 Prozent ihres Netzwerkverkehrs?
Die relative Anfälligkeit verschlüsselter Tunnel hängt von mehreren Faktoren ab. Dazu zählen etwa die Sicherheit der Protokolle, die Eigenschaften der Tunnel und der generelle Umgang mit Tunneln im Unternehmen. Im Folgenden erläutere ich, welche Arten von verschlüsselten Tunneln Cyberkriminelle am häufigsten verwenden, und wie diese Tunnel zu einem Angriff beitragen können.
Alle Arten von verschlüsselten Tunneln können bei einem Cyberangriff missbraucht werden. Virtual Private Networks (VPNs) sind die bekanntesten verschlüsselten Tunnel und gelten als anfällig, aber viele Unternehmen erkennen nicht, dass auch SSL/TLS- und SSH-Tunnel gefährdet sind. Deshalb sorgen die meisten Unternehmen nicht dafür, dass alle Tunnel, die ihre Netzwerke mit der Außenwelt verbinden, ausreichend überwacht werden. Wie sieht es damit bei Ihnen aus?
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