Amazon Linux 2023 Security Advisory: ALAS-2024-552
Advisory Release Date: 2024-02-29 10:29 Pacific
Advisory Updated Date: 2024-03-05 12:00 Pacific
Certain DNSSEC aspects of the DNS protocol (in RFC 4035 and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses when there is a zone with many DNSKEY and RRSIG records, aka the "KeyTrap" issue. The protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records. (CVE-2023-50387)
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. (CVE-2023-50868)
Affected Packages:
dnsmasq
Issue Correction:
Run dnf update dnsmasq --releasever 2023.3.20240304 to update your system.
aarch64:
dnsmasq-debuginfo-2.90-1.amzn2023.0.1.aarch64
dnsmasq-utils-debuginfo-2.90-1.amzn2023.0.1.aarch64
dnsmasq-utils-2.90-1.amzn2023.0.1.aarch64
dnsmasq-debugsource-2.90-1.amzn2023.0.1.aarch64
dnsmasq-2.90-1.amzn2023.0.1.aarch64
src:
dnsmasq-2.90-1.amzn2023.0.1.src
x86_64:
dnsmasq-debuginfo-2.90-1.amzn2023.0.1.x86_64
dnsmasq-utils-2.90-1.amzn2023.0.1.x86_64
dnsmasq-utils-debuginfo-2.90-1.amzn2023.0.1.x86_64
dnsmasq-debugsource-2.90-1.amzn2023.0.1.x86_64
dnsmasq-2.90-1.amzn2023.0.1.x86_64