High severity · published Feb 14, 2024
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…
7.5
CVSS
100%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)100.0% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
Bind · Isc
9.0.0 through 9.16.46; 9.18.0 through 9.18.22; 9.19.0 through 9.19.20 · source: NVD
DN
Dnsmasq · Thekelleys
before 2.90 · source: NVD
EL
Enterprise Linux · Redhat
6.0; 7.0; 8.0; 9.0 · source: NVD
FE
Fedora · Fedoraproject
39 · source: NVD
KR
Knot Resolver · Nic
before 5.71 · source: NVD
RE
Recursor · Powerdns
4.8.0 before 4.8.6; 4.9.0 before 4.9.3; 5.0.0 before 5.0.2 · source: NVD
UN
Unbound · Nlnetlabs
before 1.19.1 · source: NVD
WS
Windows Server 2008 · Microsoft
r2 · source: NVD
WS
Windows Server 2012 · Microsoft
r2 · source: NVD
WS
Windows Server 2016 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2019 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2022 · Microsoft
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-50387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-50387
Mailing List
http://www.openwall.com/lists/oss-security/2024/02/16/2
Mailing List
http://www.openwall.com/lists/oss-security/2024/02/16/3
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-50387
Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1219823
Third Party Advisory
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
Patch
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
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