Vulnerability · Published Feb 14, 2024 · Assigned by mitre
CVE-2023-50868
High 7.5
In plain English
A high-severity uncontrolled resource consumption in the bind package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 74.3% (higher than 99.5% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)74.3%top 0.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | bind | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:9 | bind | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:8 | bind-chroot | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-chroot | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:9 | bind-chroot | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | bind-chroot | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:8 | bind-devel | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-devel | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:9 | bind-devel | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | bind-devel | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-dnssec-doc | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | bind-dnssec-doc | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-dnssec-utils | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | bind-dnssec-utils | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-doc | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-doc | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | bind-dyndb-ldap | 11.9-9.el9_4.alma.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-dyndb-ldap | 11.9-8.el9_3.3.alma.1 | ALSA-2024:1789 |
| AlmaLinux:8 | bind-export-devel | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-export-devel | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-export-libs | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-export-libs | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-libs | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-libs | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:9 | bind-libs | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-libs | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:8 | bind-libs-lite | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-libs-lite | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-license | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-license | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:9 | bind-license | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | bind-license | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:8 | bind-lite-devel | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-lite-devel | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-pkcs11 | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-pkcs11 | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-pkcs11-devel | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-pkcs11-devel | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-pkcs11-libs | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-pkcs11-libs | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-pkcs11-utils | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-pkcs11-utils | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-sdb | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-sdb | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-sdb-chroot | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-sdb-chroot | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | bind-utils | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:8 | bind-utils | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:9 | bind-utils | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:9 | bind-utils | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:8 | bind9.16 | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-chroot | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-devel | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-dnssec-utils | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-doc | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-libs | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-license | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | bind9.16-utils | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | dnsmasq | 2.79-31.el8_9.2 | ALSA-2024:1335 |
| AlmaLinux:9 | dnsmasq | 2.85-14.el9_3.1 | ALSA-2024:1334 |
| AlmaLinux:8 | dnsmasq-utils | 2.79-31.el8_9.2 | ALSA-2024:1335 |
| AlmaLinux:9 | dnsmasq-utils | 2.85-14.el9_3.1 | ALSA-2024:1334 |
| AlmaLinux:8 | python3-bind | 32:9.11.36-14.el8_10 | ALSA-2024:3271 |
| AlmaLinux:8 | python3-bind | 32:9.11.36-11.el8_9.1 | ALSA-2024:1782 |
| AlmaLinux:9 | python3-bind | 32:9.16.23-14.el9_3.4 | ALSA-2024:1789 |
| AlmaLinux:9 | python3-bind | 32:9.16.23-18.el9_4.1 | ALSA-2024:2551 |
| AlmaLinux:8 | python3-bind9.16 | 32:9.16.23-0.16.el8_9.2.alma.1 | ALSA-2024:1781 |
| AlmaLinux:8 | python3-unbound | 1.16.2-5.el8_9.2 | ALSA-2024:0965 |
| AlmaLinux:9 | python3-unbound | 1.16.2-3.el9_3.1 | ALSA-2024:0977 |
| AlmaLinux:8 | unbound | 1.16.2-5.el8_9.2 | ALSA-2024:0965 |
| AlmaLinux:9 | unbound | 1.16.2-3.el9_3.1 | ALSA-2024:0977 |
| AlmaLinux:8 | unbound-devel | 1.16.2-5.el8_9.2 | ALSA-2024:0965 |
| AlmaLinux:9 | unbound-devel | 1.16.2-3.el9_3.1 | ALSA-2024:0977 |
| AlmaLinux:8 | unbound-libs | 1.16.2-5.el8_9.2 | ALSA-2024:0965 |
| AlmaLinux:9 | unbound-libs | 1.16.2-3.el9_3.1 | ALSA-2024:0977 |
| Alpine:v3.20 | bind | 9.18.24-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.21 | bind | 9.18.24-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.22 | bind | 9.18.24-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.23 | bind | 9.18.24-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.24 | bind | 9.18.24-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.20 | dnsmasq | 2.90-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.21 | dnsmasq | 2.90-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.22 | dnsmasq | 2.90-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.23 | dnsmasq | 2.90-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.24 | dnsmasq | 2.90-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.20 | knot-resolver | 5.7.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.21 | knot-resolver | 5.7.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.22 | knot-resolver | 5.7.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.23 | knot-resolver | 5.7.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.24 | knot-resolver | 5.7.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.20 | pdns-recursor | 5.0.2-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.21 | pdns-recursor | 5.0.2-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.22 | pdns-recursor | 5.0.2-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.23 | pdns-recursor | 5.0.2-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.24 | pdns-recursor | 5.0.2-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.20 | unbound | 1.19.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.21 | unbound | 1.19.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.22 | unbound | 1.19.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.23 | unbound | 1.19.1-r0 | ALPINE-CVE-2023-50868 |
| Alpine:v3.24 | unbound | 1.19.1-r0 | ALPINE-CVE-2023-50868 |
| Debian:12 | bind9 | 1:9.18.24-1 | DSA-5621-1 |
| Debian:12 | bind9 | 1:9.18.24-1 | DEBIAN-CVE-2023-50868 |
| Debian:13 | bind9 | 1:9.19.21-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | bind9 | 1:9.19.21-1 | DEBIAN-CVE-2023-50868 |
| Debian:12 | dnsjava | no fix listed | DEBIAN-CVE-2023-50868 |
| Debian:13 | dnsjava | 3.6.2-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | dnsjava | 3.6.2-1 | DEBIAN-CVE-2023-50868 |
| Debian:12 | dnsmasq | 2.90-4~deb12u1 | DEBIAN-CVE-2023-50868 |
| Debian:13 | dnsmasq | 2.90-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | dnsmasq | 2.90-1 | DEBIAN-CVE-2023-50868 |
| Debian:12 | knot-resolver | 5.6.0-1+deb12u1 | DSA-5633-1 |
| Debian:12 | knot-resolver | 5.6.0-1+deb12u1 | DEBIAN-CVE-2023-50868 |
| Debian:13 | knot-resolver | 5.7.1-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | knot-resolver | 5.7.1-1 | DEBIAN-CVE-2023-50868 |
| Debian:12 | pdns-recursor | 4.8.6-1 | DSA-5626-1 |
| Debian:12 | pdns-recursor | 4.8.6-1 | DEBIAN-CVE-2023-50868 |
| Debian:13 | pdns-recursor | 4.9.3-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | pdns-recursor | 4.9.3-1 | DEBIAN-CVE-2023-50868 |
| Debian:12 | systemd | 252.23-1~deb12u1 | DEBIAN-CVE-2023-50868 |
| Debian:13 | systemd | 255.4-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | systemd | 255.4-1 | DEBIAN-CVE-2023-50868 |
| Debian:12 | unbound | 1.17.1-2+deb12u2 | DSA-5620-1 |
| Debian:12 | unbound | 1.17.1-2+deb12u2 | DEBIAN-CVE-2023-50868 |
| Debian:13 | unbound | 1.19.1-1 | DEBIAN-CVE-2023-50868 |
| Debian:14 | unbound | 1.19.1-1 | DEBIAN-CVE-2023-50868 |
| Rocky Linux:8 | bind | 2:9.11.36-14.el8_10 | RLSA-2024:3271 |
| Rocky Linux:8 | bind | 2:9.11.36-11.el8_9.1 | RLSA-2024:1782 |
| Rocky Linux:9 | bind | 2:9.16.23-18.el9_4.1 | RLSA-2024:2551 |
| Rocky Linux:9 | bind-dyndb-ldap | 0:11.9-9.el9_4 | RLSA-2024:2551 |
| Rocky Linux:8 | bind9.16 | 2:9.16.23-0.16.el8_9.2 | RLSA-2024:1781 |
| Rocky Linux:8 | dhcp | 2:4.3.6-50.el8_10 | RLSA-2024:3271 |
| Rocky Linux:8 | dhcp | 2:4.3.6-49.el8_9.1 | RLSA-2024:1782 |
| Rocky Linux:8 | dnsmasq | 0:2.79-31.el8_9.2 | RLSA-2024:1335 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.18-0ubuntu0.22.04.2 | UBUNTU-CVE-2023-50868 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.18-0ubuntu0.22.04.2 | USN-6633-1 |
| Ubuntu:22.04:LTS | bind9-libs | no fix listed | UBUNTU-CVE-2023-50868 |
| Ubuntu:22.04:LTS | dnsmasq | 2.90-0ubuntu0.22.04.1 | USN-6657-1 |
| Ubuntu:22.04:LTS | dnsmasq | 2.90-0ubuntu0.22.04.1 | UBUNTU-CVE-2023-50868 |
| Ubuntu:24.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2023-50868 |
| Ubuntu:25.10 | isc-dhcp | no fix listed | UBUNTU-CVE-2023-50868 |
| Ubuntu:26.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2023-50868 |
| Ubuntu:22.04:LTS | unbound | 1.13.1-1ubuntu5.4 | UBUNTU-CVE-2023-50868 |
| Ubuntu:22.04:LTS | unbound | 1.13.1-1ubuntu5.17 | USN-8946-1 |
| Ubuntu:22.04:LTS | unbound | 1.13.1-1ubuntu5.4 | USN-6665-1 |
| Ubuntu:24.04:LTS | unbound | 1.19.2-1ubuntu3.12 | USN-8946-1 |
| Ubuntu:24.04:LTS | unbound | 1.19.1-1ubuntu1 | UBUNTU-CVE-2023-50868 |
| Ubuntu:26.04:LTS | unbound | 1.24.2-1ubuntu2.4 | USN-8946-1 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
- https://www.isc.org/blogs/2024-bind-security-release/
- https://datatracker.ietf.org/doc/html/rfc5155
- https://kb.isc.org/docs/cve-2023-50868
- https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
- https://access.redhat.com/security/cve/CVE-2023-50868
- https://bugzilla.suse.com/show_bug.cgi?id=1219826
- [oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities mailing-list
- [oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities mailing-list
- FEDORA-2024-2e26eccfcb vendor-advisory
- FEDORA-2024-e24211eff0 vendor-advisory
- FEDORA-2024-21310568fa vendor-advisory
- [debian-lts-announce] 20240221 [SECURITY] [DLA 3736-1] unbound security update mailing-list
- FEDORA-2024-b0f9656a76 vendor-advisory
- FEDORA-2024-4e36df9dfd vendor-advisory
- FEDORA-2024-499b9be35f vendor-advisory
- FEDORA-2024-c36c448396 vendor-advisory
- FEDORA-2024-c967c7d287 vendor-advisory
- FEDORA-2024-e00eceb11c vendor-advisory
- FEDORA-2024-fae88b73eb vendor-advisory
- https://security.netapp.com/advisory/ntap-20240307-0008/
- [debian-lts-announce] 20240517 [SECURITY] [DLA 3816-1] bind9 security update mailing-list
- https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
- https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/