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Java Secure Socket Extension (JSSE) SKIP-TLS MITM Proxy

This module exploits an incomplete internal state distinction in Java Secure Socket Extension (JSSE) by impersonating the server and finishing the handshake before the peers have authenticated themselves and instantiated negotiated security parameters, resulting in a plaintext SSL/TLS session with the client. This plaintext SSL/TLS session is then proxied to the server using a second SSL/TLS session from the proxy to the server (or an alternate fake server) allowing the session to continue normally and plaintext application data transmitted between the peers to be saved. This module requires an active man-in-the-middle attack.

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Module Name



  • Ramon de C Valle <rcvalle [at]>



  • Service



Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/server/jsse_skiptls_mitm_proxy msf auxiliary(jsse_skiptls_mitm_proxy) > show actions ...actions... msf auxiliary(jsse_skiptls_mitm_proxy) > set ACTION <action-name> msf auxiliary(jsse_skiptls_mitm_proxy) > show options and set options... msf auxiliary(jsse_skiptls_mitm_proxy) > run

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