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Encrypted traffic interception on Hetzner and Linode targeting the largest Russian XMPP (Jabber) messaging service — (notes.valdikss.org.ru)

submitted 11 months ago by [email protected] to c/[email protected]

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XMPP (Jabber) instant messaging protocol encrypted TLS connection wiretapping (Man-in-the-Middle attack) of jabber.ru (aka xmpp.ru) service’s servers on Hetzner and Linode hosting providers in Germany. The attacker has issued several new TLS certificates using Let’s Encrypt service which were used to hijack encrypted STARTTLS connections on port 5222 using transparent MiTM proxy. The attack was discovered due to expiration of one of the MiTM certificates, which haven’t been reissued.

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