Public on 2023-10-16
Modified on 2024-02-03
It was discovered that the numerical library used in NSS for RSA cryptography leaks information whether high order bits of the RSA decryption result are zero. This information can be used to mount a Bleichenbacher or Manger like attack against all RSA decryption operations. As the leak happens before any padding operations, it affects all padding modes: PKCS#1 v1.5, OAEP, and RSASVP. Both API level calls and TLS server operation are affected.
Medium severity
CVSS v3 Base Score
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2023 nss 2024-01-19 ALAS2023-2024-492 Fixed
Amazon Linux 1 nss-softokn 2024-01-19 ALAS-2024-1907 Fixed
Amazon Linux 2 - Core nss-softokn 2024-01-19 ALAS2-2024-2419 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N