CVE-2023-50387

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 39.62% Top 5%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory microsoft.com Vendor Advisory nlnetlabs.nl
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://www.athene-center.de/aktuelles/key-trap third party advisory
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/ vendor advisory
https://kb.isc.org/docs/cve-2023-50387 third party advisory vdb entry
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html third party advisory
https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/ third party advisory patch
https://news.ycombinator.com/item?id=39367411 third party advisory
https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/ third party advisory press/media coverage
https://www.isc.org/blogs/2024-bind-security-release/ third party advisory
https://news.ycombinator.com/item?id=39372384 issue tracking
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 patch
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html third party advisory mailing list
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 patch vendor advisory
https://access.redhat.com/security/cve/CVE-2023-50387 third party advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219823 issue tracking
https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf third party advisory technical description
http://www.openwall.com/lists/oss-security/2024/02/16/2 mailing list
http://www.openwall.com/lists/oss-security/2024/02/16/3 mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ vendor advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ vendor advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ vendor advisory mailing list
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/ vendor advisory
https://security.netapp.com/advisory/ntap-20240307-0007/
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html mailing list

Frequently Asked Questions

What is the severity of CVE-2023-50387?
CVE-2023-50387 has been scored as a high severity vulnerability.
How to fix CVE-2023-50387?
To fix CVE-2023-50387, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-50387 being actively exploited in the wild?
It is possible that CVE-2023-50387 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~40% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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