{"id":36033,"date":"2019-10-31T22:09:16","date_gmt":"2019-10-31T19:09:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vypusk-gnupg-2-2-17-s-izmeneniyami-dlya-protivostoyaniya-atake-na-servery-klyuchej\/"},"modified":"2019-10-31T22:09:16","modified_gmt":"2019-10-31T19:09:16","slug":"vypusk-gnupg-2-2-17-s-izmeneniyami-dlya-protivostoyaniya-atake-na-servery-klyuchej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/vypusk-gnupg-2-2-17-s-izmeneniyami-dlya-protivostoyaniya-atake-na-servery-klyuchej","title":{"rendered":"Release of GnuPG 2.2.17 with changes to thwart attacks on key servers","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Published<\/a><\/noindex> Tool Release GnuPG 2.2.17<\/a><\/noindex> (GNU Privacy Guard), compliant with OpenPGP standards (RFC-4880<\/a><\/noindex>) and S\/MIME, providing utilities for data encryption, working with digital signatures, key management, and access to public key repositories. Remember that the GnuPG 2.2 branch is positioned as a developing release, where new features continue to be added, while only corrective fixes are allowed in the 2.1 branch.<\/p>\n

The new release offers measures to counter attacks on key servers<\/a><\/noindex>, which can lead to GnuPG hanging and prevent further operation until the problematic certificate is removed from the local store or the certificate store is recreated based on verified public keys. The added protection relies on completely ignoring by default all third-party digital signatures of certificates obtained from key storage servers. It\u2019s worth noting that any user can add their digital signature for arbitrary certificates on the key storage server, which is exploited by attackers to create a vast number of such signatures (over a hundred thousand) for the victim's certificate, processing of which disrupts the normal operation of GnuPG.<\/p>\n

The ignoring of third-party digital signatures is governed by the 'self-sigs-only' option, which allows the uploading of only the creator's own signatures for keys. To restore the old behavior, add the setting 'keyserver-options no-self-sigs-only,no-import-clean' in gpg.conf. However, if during operation it detects the import of a number of blocks that will overflow the local storage (pubring.kbx), GnuPG automatically switches to ignoring digital signatures ('self-sigs-only,import-clean') instead of outputting an error. <\/p>\n

To update keys using the mechanism Web Key Directory<\/a><\/noindex> The (WKD) has introduced the '--locate-external-key' option, which can be used to recreate the certificate store based on verified public keys. When executing the '--auto-key-retrieve' operation, the WKD mechanism is now more preferred than key servers. The essence of WKD is to host public keys on the web, tied to the domain specified in the email address. For example, for the address 'test@example.com', the key can be retrieved via the link 'https:\/\/example.com\/.well-known\/openpgpkey\/hu\/183d7d5ab73cfceece9a5594e6039d5a'.<\/p>\n

<\/a><\/noindex><\/p>\n

Source: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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