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CVE-2020-25659

Published: 28 October 2020

python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
python-cryptography
Launchpad, Ubuntu, Debian
bionic
Released (2.1.4-1ubuntu1.4)
focal
Released (2.8-3ubuntu0.1)
groovy
Released (3.0-1ubuntu0.1)
trusty Does not exist

upstream
Released (3.2.1-1)
xenial
Released (1.2.3-1ubuntu0.3)
Patches:
upstream: https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494 (3.2)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N