CVE-2023-50868

Public on 2024-02-14
Modified on 2024-04-02
Description
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.
Severity
Important severity
Important
CVSS v3 Base Score
7.5
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 1 bind Pending Fix
Amazon Linux 2 - Core bind Pending Fix
Amazon Linux 2023 bind 2024-02-29 ALAS2023-2024-550 Fixed
Amazon Linux 1 dnsmasq Not Affected
Amazon Linux 2 - Dnsmasq2.85 Extra dnsmasq Pending Fix
Amazon Linux 2 - Core dnsmasq Not Affected
Amazon Linux 2 - Dnsmasq Extra dnsmasq 2024-04-10 ALAS2DNSMASQ-2024-002 Fixed
Amazon Linux 2023 dnsmasq 2024-02-29 ALAS2023-2024-552 Fixed
Amazon Linux 1 unbound Pending Fix
Amazon Linux 2 - Unbound1.13 Extra unbound Pending Fix
Amazon Linux 2 - Unbound1.17 Extra unbound Pending Fix
Amazon Linux 2 - Core unbound 2024-02-29 ALAS2-2024-2481 Fixed
Amazon Linux 2023 unbound 2024-02-29 ALAS2023-2024-553 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H