Python-apt doesn’t check if hashes are signed in `Version.fetch_binary()` and `Version.fetch_source()` of apt/ or in `_fetch_archives()` of apt/ in version 1.9.3ubuntu2 and earlier. This allows downloads from unsigned repositories which shouldn’t be allowed and has been fixed in verisions 1.9.5, 1.9.0ubuntu1.2, 1.6.5ubuntu0.1, 1.1.0~beta1ubuntu0.16.04.7,, and 0.8.3ubuntu7.5.

Source: CVE-2019-15796

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