Decrypting TLS Browser Traffic with Wireshark

Re:Decrypting TLS Browser Traffic with Wireshark by weland on Friday February 13, 2015 @04:30AM (#9043563)

It could be named "A rather unfortunate architectural decision that can make browsers write keys in plaintext without users explicitly enabling it" but that would be a little verbose. A malicious program can add a SSLKEYLOGFILE environment variable (if it's not systemwide, it doesn't need root privileges for that).

I guess we can haggle over whether or not this meets the "definition" of a backdoor. "Can give unrestricted access to encryption keys" is backdoor in my book, but I'm not a fan of taxonomy, the retarded child of sciences :).

I can understand why this... um, this feature, would be useful in developer builds. Why it's present in anything that is shipped to users is beyond my ability to comprehend. It should be behind an ENABLE_DANGEROUS_PLAINTEXT_LOGGING switch that is off by default. What's the thought process by which someone decides giving this to users is a good idea? Is there something I'm missing here?

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Re:Decrypting TLS Browser Traffic with Wireshark by nodata on Friday February 13, 2015 @04:41AM (#9043586)

If the attacker can add an environment variable, they can add a command-line switch or about:config value or modify my firefox binary or install an addon that saves my password fields.

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Re:Decrypting TLS Browser Traffic with Wireshark by vidarh on Friday February 13, 2015 @07:41AM (#9044011)

If I carelessly execute ~/Downloads/some-binary, my environment variables and config settings are now suspect , while overwriting my firefox binary requires root access.

As such, having the browser loudly warn (irrespective of settings) about such unsafe defaults is still vastly better.

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Re:Decrypting TLS Browser Traffic with Wireshark by Animats on Friday February 13, 2015 @02:52PM (#9046779)

As such, having the browser loudly warn (irrespective of settings) about such unsafe defaults is still vastly better.

Yes. Loudly. As in "surrounds entire window with a red frame with INSECURE TEST MODE ENABLED", not as in "pops up notification that quietly fades out".

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Re:Decrypting TLS Browser Traffic with Wireshark by nodata on Monday February 16, 2015 @04:44AM (#9056030)

But poisoning your Firefox binary does not require root access. Just preload what you want.

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Re:Decrypting TLS Browser Traffic with Wireshark by teddyh on Friday February 13, 2015 @06:36AM (#9043830)

While technically true, that did not prevent Shellshock from being a big deal.

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Re:Decrypting TLS Browser Traffic with Wireshark by bodyfour on Friday February 13, 2015 @06:51AM (#9043876)

Shellshock was a big deal because the attacker only needed to control the value of an environment variable, not its name. There are many vectors to provide a string that will end up stored in some environment variable, far fewer that will allow you to specify a particular name/value pair.

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