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Date: Wed, 31 Oct 2018 15:29:15 +0100
From: Jakub Wilk <>
Subject: Re: Re: Travis CI MITM RCE

* Daniel Kahn Gillmor <>, 2018-10-29, 08:52:
>>My proposed fix was to use "gpg --recv-key" with full fingerprint. But 
>>I now discovered that even this is not resistant against MitM attacks:
>>"[...] modern gpg automatically applies an import screener that only 
>>accepts OpenPGP certificates that have the given fingerprint [...]
>It may be even worse than this, because the version of gpg used by 
>default in travis is not "modern gpg", it's either gnupg2 
>2.0.22-3ubuntu1.4 or gnupg 1.4.16-1ubuntu2.6.  I don't think either of 
>these has the baseline "import screener" functionality

Ubuntu Precise and later releases have the import screener backported to 
gnupg(2) packages:

Jakub Wilk

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