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CVE-2021-3580

Published: 10 June 2021

A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and denial of service.

Notes

AuthorNote
mdeslaur
this fix relies on the RSA refactoring that is required to
fix CVE-2018-16869, which is too intrusive to backport to older
releases

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
nettle
Launchpad, Ubuntu, Debian
bionic
Released (3.4.1-0ubuntu0.18.04.1)
focal
Released (3.5.1+really3.5.1-2ubuntu0.2)
groovy
Released (3.6-2ubuntu0.2)
hirsute
Released (3.7-2.1ubuntu1.1)
impish Not vulnerable
(3.7.3-1)
jammy Not vulnerable
(3.7.3-1)
kinetic Not vulnerable
(3.7.3-1)
trusty Ignored
(change too intrusive)
upstream
Released (3.7.3-1)
xenial Ignored
(change too intrusive)
Patches:
upstream: https://git.lysator.liu.se/nettle/nettle/-/commit/485b5e2820a057e873b1ba812fdb39cae4adf98c
upstream: https://git.lysator.liu.se/nettle/nettle/-/commit/0ad0b5df315665250dfdaa4a1e087f4799edaefe

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H