A Bleichenbacher type side-channel based padding oracle attack was found in
the way nettle handles endian conversion of RSA decrypted PKCS#1 v1.5 data.
An attacker who is able to run a process on the same physical core as the
victim process, could use this flaw extract plaintext or in some cases
downgrade any TLS connections to a vulnerable server.
mdeslaurnettle changes are too intrusive to backport to stable releases
Upstream:released (3.4.1~rc1-1)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):needed
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):needed
Ubuntu 19.04 (Disco Dingo):not-affected (3.4.1~rc1-1)
Ubuntu 19.10 (Eoan Ermine):not-affected (3.4.1~rc1-1)
Ubuntu 20.04 (Focal Fossa):not-affected (3.4.1~rc1-1)
More Information

Updated: 2019-12-05 19:54:29 UTC (commit 0aa5e7c87c8b55d2ec5c7f4ca1179cf75de91961)