TLS Proxy is a Proxy Server that decrypts the TLS and passing on the unencrypted request to other servers and is by definition a Man-In-The-Middle attack.

TLS Proxy which we have seen described as Legal SSL\TLS Interception are by definition a Man-In-The-Middle exploit as described in TLS is Broken.


The Security Impact of HTTPS Interception, highlighted several security concerns with HTTPS inspection products and outlined survey results of these issues. Many HTTPS inspection products do not properly verify the Certificate Chain of the server before re-encrypting and forwarding client data, allowing the possibility of a MiTM attack. Furthermore, certificate-chain verification errors are infrequently forwarded to the client, leading a client to believe that operations were performed as intended with the correct server. This report provided a method to allow servers to detect clients that are having their traffic manipulated by HTTPS inspection products. The website badssl.com is a resource where clients can verify whether their HTTPS inspection products are properly verifying certificate chains. Clients can also use this site to verify whether their HTTPS inspection products are enabling connections to websites that a browser or other client would otherwise reject. For example, an HTTPS inspection product may allow deprecated protocol versions or weak ciphers to be used between itself and a web server. Because client systems may connect to the HTTPS inspection product using strong cryptography, the user will be unaware of any weakness on the other side of the HTTPS Inspection.

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« This page (revision-8) was last changed on 20-Mar-2017 13:36 by jim