NVD will deprecate the v1.1 API which allows us to download the full
database as individual JSON files. Instead, there's a horribly crappy
API that is extremely slow and subject to race conditions.
Fortunately, there is a project, Fraunhofer FKIE - Cyber Analysis and
Defense [1], that goes through the effort of adapting to this new API
and regenerating the convenient JSON files. The JSON files and meta
files are re-generated daily.
Instead of implementing the NVD v2 API, we decided to just use the JSON
files generatd by fkie-cad. That saves us the effort of solving the race
conditions, devising a cache mechanism that works, handling the frequent
gateway timeouts on the NVD servers, dealing with the rate limiting, and
keeping up with changes in the API.
Switch to this repository on github as NVD_BASE_URL. The file name is
also slightly different (CVE-20XX.json instead of nvdcve-1.1-20XX.json).
The fkie-cad repository compresses with xz instead of gz. Therefore:
- rename the filename variables to _xz instead of _gz;
- use xz as a subprocess because there is no xz decompressor in Python
stdlib.
[1] https://www.fkie.fraunhofer.de/en/departments/cad.html
Cc: Daniel Lang <dalang@gmx.at>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
22b6945552