Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Netapp | Hci Baseboard Management Controller | - |
| Netapp | H300S | - |
| Netapp | H410C | - |
| Netapp | H410S | - |
| Netapp | H500S | - |
| Netapp | H700S | - |
| Netapp | Active Iq Unified Manager | - |
| Netapp | Bootstrap Os | - |
| Netapp | Hci Compute Node | - |
| Powerdns | Recursor | < 4.8.5 |
| Redhat | Enterprise Linux | 6.0 |
| Debian | Debian Linux | 10.0 |
| Fedoraproject | Fedora | 38 |
| Isc | Bind | >= 9.0.0, < 9.16.48 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2024/02/16/2Issue TrackingMailing List
- http://www.openwall.com/lists/oss-security/2024/02/16/3Issue TrackingMailing List
- https://access.redhat.com/security/cve/CVE-2023-50868Vendor Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1219826Issue Tracking
- https://datatracker.ietf.org/doc/html/rfc5155Technical Description
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01Vendor Advisory
- https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1Release Notes
- https://kb.isc.org/docs/cve-2023-50868Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/02/msg00006.htmlMailing ListVendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/05/msg00011.htmlMailing ListVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListVendor Advisory
FAQ
What is CVE-2023-50868?
CVE-2023-50868 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2023-50868?
CVE-2023-50868 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-50868?
Check the references section above for vendor advisories and patch information. Affected products include: Netapp Hci Baseboard Management Controller, Netapp H300S, Netapp H410C, Netapp H410S, Netapp H500S.