CVE-2023-50868
- State
- Published
- Severity
- 7.5 High
- Published
- Feb 14, 2024
- Updated
- Nov 4, 2025
- Reserved
- Dec 14, 2023
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | CISA-ADP |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
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 vulnerabilitiesmailing-list
- [oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilitiesmailing-list
- FEDORA-2024-2e26eccfcbvendor-advisory
- FEDORA-2024-e24211eff0vendor-advisory
- FEDORA-2024-21310568favendor-advisory
- [debian-lts-announce] 20240221 [SECURITY] [DLA 3736-1] unbound security updatemailing-list
- FEDORA-2024-b0f9656a76vendor-advisory
- FEDORA-2024-4e36df9dfdvendor-advisory
- FEDORA-2024-499b9be35fvendor-advisory
- FEDORA-2024-c36c448396vendor-advisory
- FEDORA-2024-c967c7d287vendor-advisory
- FEDORA-2024-e00eceb11cvendor-advisory
- FEDORA-2024-fae88b73ebvendor-advisory
- https://security.netapp.com/advisory/ntap-20240307-0008/
- [debian-lts-announce] 20240517 [SECURITY] [DLA 3816-1] bind9 security updatemailing-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/
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