CVE-2023-50387
HIGHCVSS 7.5/10EPSS 100.00%
Last modified
CVE-2023-50387 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.. EPSS estimates a 100.00% chance of exploitation in the next 30 days.
Description
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
100.0th percentile
Probability of exploitation in the next 30 days. Learn more
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Redhat | Enterprise Linux | 6.0 | — |
| Redhat | Enterprise Linux | 7.0 | — |
| Redhat | Enterprise Linux | 8.0 | — |
| Redhat | Enterprise Linux | 9.0 | — |
| Microsoft | Windows Server 2008 | r2 | Sp1 |
| Microsoft | Windows Server 2012 | All versions | — |
| Microsoft | Windows Server 2012 | r2 | — |
| Microsoft | Windows Server 2016 | All versions | — |
| Microsoft | Windows Server 2019 | All versions | — |
| Microsoft | Windows Server 2022 | All versions | — |
| Microsoft | Windows Server 2022 23h2 | All versions | — |
| Fedoraproject | Fedora | 39 | — |
| Thekelleys | Dnsmasq | < 2.90 | — |
| Nic | Knot Resolver | < 5.71 | — |
| Powerdns | Recursor | >= 4.8.0, < 4.8.6 | — |
| Powerdns | Recursor | >= 4.9.0, < 4.9.3 | — |
| Powerdns | Recursor | >= 5.0.0, < 5.0.2 | — |
| Isc | Bind | >= 9.0.0, <= 9.16.46 | — |
| Isc | Bind | >= 9.18.0, <= 9.18.22 | — |
| Isc | Bind | >= 9.19.0, <= 9.19.20 | — |
| Nlnetlabs | Unbound | < 1.19.1 | — |
References
- https://access.redhat.com/security/cve/CVE-2023-50387Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1219823Issue Tracking
- https://kb.isc.org/docs/cve-2023-50387Third Party Advisory, VDB Entry
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.htmlMailing List, Third Party Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387Patch, Vendor Advisory
- https://news.ycombinator.com/item?id=39367411Third Party Advisory
- https://news.ycombinator.com/item?id=39372384Issue Tracking
- https://www.athene-center.de/aktuelles/key-trapThird Party Advisory
- https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdfTechnical Description, Third Party Advisory
- https://www.isc.org/blogs/2024-bind-security-release/Third Party Advisory
- https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/Press/Media Coverage, Third Party Advisory
- https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/Patch, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-50387Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1219823Issue Tracking
- https://kb.isc.org/docs/cve-2023-50387Third Party Advisory, VDB Entry
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.htmlMailing List, Third Party Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387Patch, Vendor Advisory
- https://news.ycombinator.com/item?id=39367411Third Party Advisory
- https://news.ycombinator.com/item?id=39372384Issue Tracking
- https://www.athene-center.de/aktuelles/key-trapThird Party Advisory
- https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdfTechnical Description, Third Party Advisory
- https://www.isc.org/blogs/2024-bind-security-release/Third Party Advisory
- https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/Press/Media Coverage, Third Party Advisory
- https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2023-50387?
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
How severe is CVE-2023-50387?
CVE-2023-50387 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 100.00% probability of exploitation in the next 30 days.
How do I fix CVE-2023-50387?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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