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VuXML IDDescription
21a854cc-cac1-11ee-b7a7-353f1e043d9aDNSSEC validators -- denial-of-service/CPU exhaustion from KeyTrap and NSEC3 vulnerabilities

Simon Kelley reports:

If DNSSEC validation is enabled, then an attacker who can force a DNS server to validate a specially crafted signed domain can use a lot of CPU in the validator. This only affects dnsmasq installations with DNSSEC enabled.

Stichting NLnet Labs reports:

The KeyTrap [CVE-2023-50387] vulnerability works by using a combination of Keys (also colliding Keys), Signatures and number of RRSETs on a malicious zone. Answers from that zone can force a DNSSEC validator down a very CPU intensive and time costly validation path.

The NSEC3 [CVE-2023-50868] vulnerability uses specially crafted responses on a malicious zone with multiple NSEC3 RRSETs to force a DNSSEC validator down a very CPU intensive and time costly NSEC3 hash calculation path.


Discovery 2024-02-06
Entry 2024-02-13
Modified 2024-04-01
bind916
< 9.16.48

bind918
< 9.18.24

bind9-devel
< 9.19.21

dnsmasq
< 2.90

dnsmasq-devel
< 2.90

powerdns-recursor
< 5.0.2

unbound
< 1.19.1

FreeBSD
>= 14.0 lt 14.0_6

>= 13.2 lt 13.2_11

CVE-2023-50387
CVE-2023-50868
https://kb.isc.org/docs/cve-2023-50387
https://kb.isc.org/docs/cve-2023-50868
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
SA-24:03.unbound