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CVE-2023-50868

Public on 2024-02-14
Modified on 2024-02-14
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
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CVSS v3 Base Score
7.5
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core bind 2024-04-24 22:15 ALAS2-2024-2530
Amazon Linux 2023 bind 2024-02-29 10:29 ALAS2023-2024-550
Amazon Linux 2 - Dnsmasq Extra dnsmasq 2024-04-10 22:27 ALAS2DNSMASQ-2024-002
Amazon Linux 2023 dnsmasq 2024-02-29 10:29 ALAS2023-2024-552
Amazon Linux 2 - Core unbound 2024-02-29 10:03 ALAS2-2024-2481
Amazon Linux 2023 unbound 2024-02-29 10:29 ALAS2023-2024-553

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