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.
Author | Note |
---|---|
alexmurray | As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs |
mdeslaur | This is unlikely to affect isc-dhcp’s use of bind9-libs and the vendored bind9 libs, marking as negligible |
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | bind9 | < 1:9.11.3+dfsg-1ubuntu1.19+esm3 | UNKNOWN |
ubuntu | 20.04 | noarch | bind9 | < 1:9.16.48-0ubuntu0.20.04.1 | UNKNOWN |
ubuntu | 22.04 | noarch | bind9 | < 1:9.18.18-0ubuntu0.22.04.2 | UNKNOWN |
ubuntu | 23.10 | noarch | bind9 | < 1:9.18.18-0ubuntu2.1 | UNKNOWN |
ubuntu | 24.04 | noarch | bind9 | < 1:9.18.24-0ubuntu1 | UNKNOWN |
ubuntu | 14.04 | noarch | bind9 | < 1:9.9.5.dfsg-3ubuntu0.19+esm12 | UNKNOWN |
ubuntu | 16.04 | noarch | bind9 | < 1:9.10.3.dfsg.P4-8ubuntu1.19+esm8 | UNKNOWN |
ubuntu | 20.04 | noarch | bind9-libs | < any | UNKNOWN |
ubuntu | 22.04 | noarch | bind9-libs | < any | UNKNOWN |
ubuntu | 18.04 | noarch | dnsmasq | < 2.90-0ubuntu0.18.04.1+esm1 | UNKNOWN |
blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released
kb.isc.org/docs/cve-2023-50868
launchpad.net/bugs/cve/CVE-2023-50868
lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt
nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
nvd.nist.gov/vuln/detail/CVE-2023-50868
security-tracker.debian.org/tracker/CVE-2023-50868
ubuntu.com/security/notices/USN-6633-1
ubuntu.com/security/notices/USN-6642-1
ubuntu.com/security/notices/USN-6657-1
ubuntu.com/security/notices/USN-6657-2
ubuntu.com/security/notices/USN-6665-1
ubuntu.com/security/notices/USN-6723-1
www.cve.org/CVERecord?id=CVE-2023-50868
www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html