Vulnerability DatabaseCVE-2023-50387
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CVE-2023-50387
February 14, 2024
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.
Related Resources (40)
https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
https://security.netapp.com/advisory/ntap-20240307-0007/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
https://news.ycombinator.com/item?id=39367411
https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
https://security-tracker.debian.org/tracker/CVE-2023-50387
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
https://datatracker.ietf.org/doc/html/rfc4035
https://bugzilla.suse.com/show_bug.cgi?id=1219823
https://news.ycombinator.com/item?id=39372384
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
https://kb.isc.org/docs/cve-2023-50387
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
http://www.openwall.com/lists/oss-security/2024/02/16/2
https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
http://www.openwall.com/lists/oss-security/2024/02/16/3
https://access.redhat.com/security/cve/CVE-2023-50387
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
https://github.com/isc-projects/bind9/commit/435787efa3189a4b3b0705d1a6d0339cc5b60162
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
https://www.isc.org/blogs/2024-bind-security-release/
https://security.alpinelinux.org/vuln/CVE-2023-50387
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
https://www.athene-center.de/aktuelles/key-trap
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
CWE-770
EPSS
Base Score:
51.99