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
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | bind | Pending Fix | ||
| Amazon Linux 2 - Core | bind | 2024-04-24 | ALAS2-2024-2530 | Fixed |
| 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 |