CVE-2023-50387
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8 High
AI Score
Confidence
High
0.05 Low
EPSS
Percentile
92.9%
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.
Affected configurations
References
www.openwall.com/lists/oss-security/2024/02/16/2
www.openwall.com/lists/oss-security/2024/02/16/3
access.redhat.com/security/cve/CVE-2023-50387
bugzilla.suse.com/show_bug.cgi?id=1219823
docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
kb.isc.org/docs/cve-2023-50387
lists.debian.org/debian-lts-announce/2024/02/msg00006.html
lists.debian.org/debian-lts-announce/2024/05/msg00011.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
news.ycombinator.com/item?id=39367411
news.ycombinator.com/item?id=39372384
nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
security.netapp.com/advisory/ntap-20240307-0007/
www.athene-center.de/aktuelles/key-trap
www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
www.isc.org/blogs/2024-bind-security-release/
www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
Related
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8 High
AI Score
Confidence
High
0.05 Low
EPSS
Percentile
92.9%