Messaging Service Wiretap Discovered through Expired TLS Cert

6 months ago AndyC

Messaging Service Wiretap Discovered through Expired TLS Cert
Fascinating story of a covert wiretap that was discovered because of an expired TLS certificate:

The suspected man-in-the-middle attack was identified when the administrator of jabber.

Messaging Service Wiretap Discovered through Expired TLS Cert

Fascinating story of a covert wiretap that was discovered because of an expired TLS certificate:

The suspected man-in-the-middle attack was identified when the administrator of jabber.ru, the largest Russian XMPP service, received a notification that one of the servers’ certificates had expired.

However, jabber.ru found no expired certificates on the server, as explained in a blog post by ValdikSS, a pseudonymous anti-censorship researcher based in Russia who collaborated on the investigation.

The expired certificate was instead discovered on a single port being used by the service to establish an encrypted Transport Layer Security (TLS) connection with users. Before it had expired, it would have allowed someone to decrypt the traffic being exchanged over the service.

Tags: certificates, man-in-the-middle attacks, privacy, surveillance, TLS

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AndyC

Andy Curtis is an award-winning security consultant, researcher and public speaker. He has been working in the computer security industry since the early 1990s, having been employed by state and federal government, leading healthcare and banking providers across three continents. He has given talks about computer security for some of the world’s largest companies, worked with law enforcement agencies on investigations into hacking groups, and is a regular voice on TV and radio explaining IT security threats.

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