CVE-2023-50387

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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.

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
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://access.redhat.com/security/cve/CVE-2023-50387 Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219823 Issue Tracking
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html Third Party Advisory
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 Patch
https://kb.isc.org/docs/cve-2023-50387 Third Party Advisory VDB Entry
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ Mailing List
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/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html Mailing List Third Party Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 Patch Vendor Advisory
https://news.ycombinator.com/item?id=39367411 Third Party Advisory
https://news.ycombinator.com/item?id=39372384 Issue Tracking
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/ Vendor Advisory
https://security.netapp.com/advisory/ntap-20240307-0007/
https://www.athene-center.de/aktuelles/key-trap Third Party Advisory
https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf Technical 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
http://www.openwall.com/lists/oss-security/2024/02/16/2 Mailing List
https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/ Patch 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.isc.org/blogs/2024-bind-security-release/ Third Party Advisory
https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf Technical Description Third Party Advisory
https://www.athene-center.de/aktuelles/key-trap Third Party Advisory
https://security.netapp.com/advisory/ntap-20240307-0007/
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/ Vendor Advisory
https://news.ycombinator.com/item?id=39372384 Issue Tracking
https://news.ycombinator.com/item?id=39367411 Third Party Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 Patch Vendor Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ Mailing List
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/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
https://kb.isc.org/docs/cve-2023-50387 Third Party Advisory VDB Entry
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 Patch
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219823 Issue Tracking
https://access.redhat.com/security/cve/CVE-2023-50387 Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/02/16/3 Mailing List
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:-:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

Configuration 4 (hide)

cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*

Configuration 5 (hide)

cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:*

Configuration 6 (hide)

OR cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*

Configuration 7 (hide)

OR cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*

Configuration 8 (hide)

cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
History

10 Jun 2024, 17:16

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html -

07 Mar 2024, 17:15

Type Values Removed Values Added
References
  • () https://security.netapp.com/advisory/ntap-20240307-0007/ -

04 Mar 2024, 03:15

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/ -

29 Feb 2024, 03:15

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/ -
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/ -

26 Feb 2024, 16:27

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/ -
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/ -

23 Feb 2024, 02:15

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/ -
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/ -

21 Feb 2024, 13:15

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html -

20 Feb 2024, 16:55

Type Values Removed Values Added
First Time Fedoraproject fedora
Isc bind
Microsoft windows Server 2008
Isc
Microsoft windows Server 2022
Redhat
Thekelleys dnsmasq
Powerdns recursor
Fedoraproject
Microsoft windows Server 2022 23h2
Nlnetlabs
Thekelleys
Powerdns
Nlnetlabs unbound
Microsoft windows Server 2019
Microsoft windows Server 2012
Nic knot Resolver
Microsoft windows Server 2016
Microsoft
Nic
Redhat enterprise Linux
References () https://www.athene-center.de/aktuelles/key-trap - () https://www.athene-center.de/aktuelles/key-trap - Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ - Mailing List
References () https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/ - () https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/ - Patch, Third Party Advisory
References () https://news.ycombinator.com/item?id=39367411 - () https://news.ycombinator.com/item?id=39367411 - Third Party Advisory
References () https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf - () https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf - Technical Description, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2024/02/16/2 - () http://www.openwall.com/lists/oss-security/2024/02/16/2 - Mailing List
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 - Patch, Vendor Advisory
References () https://news.ycombinator.com/item?id=39372384 - () https://news.ycombinator.com/item?id=39372384 - Issue Tracking
References () https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/ - () https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/ - Press/Media Coverage, Third Party Advisory
References () https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html - () https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html - Mailing List, Third Party Advisory
References () https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html - () https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html - Third Party Advisory
References () https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/ - () https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/ - Vendor Advisory
References () https://bugzilla.suse.com/show_bug.cgi?id=1219823 - () https://bugzilla.suse.com/show_bug.cgi?id=1219823 - Issue Tracking
References () https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 - () https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 - Patch
References () http://www.openwall.com/lists/oss-security/2024/02/16/3 - () http://www.openwall.com/lists/oss-security/2024/02/16/3 - Mailing List
References () https://access.redhat.com/security/cve/CVE-2023-50387 - () https://access.redhat.com/security/cve/CVE-2023-50387 - Third Party Advisory
References () https://kb.isc.org/docs/cve-2023-50387 - () https://kb.isc.org/docs/cve-2023-50387 - Third Party Advisory, VDB Entry
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ - Mailing List
References () https://www.isc.org/blogs/2024-bind-security-release/ - () https://www.isc.org/blogs/2024-bind-security-release/ - Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ - Mailing List
CPE cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:-:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5
CWE CWE-770

19 Feb 2024, 03:15

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ -
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ -

18 Feb 2024, 02:15

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ -

16 Feb 2024, 21:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2024/02/16/3 -

16 Feb 2024, 20:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2024/02/16/2 -

15 Feb 2024, 19:15

Type Values Removed Values Added
References
  • {'url': 'https://datatracker.ietf.org/doc/html/rfc4035', 'name': 'https://datatracker.ietf.org/doc/html/rfc4035', 'tags': [], 'refsource': ''}
  • () https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf -
Summary Certain DNSSEC aspects of the DNS protocol (in RFC 4035 and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses when there is a zone with many DNSKEY and RRSIG records, aka the "KeyTrap" issue. The protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records. 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.

15 Feb 2024, 01:15

Type Values Removed Values Added
References
  • () https://bugzilla.suse.com/show_bug.cgi?id=1219823 -
  • () https://access.redhat.com/security/cve/CVE-2023-50387 -
  • () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 -

15 Feb 2024, 00:15

Type Values Removed Values Added
References
  • () https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 -
  • () https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html -

14 Feb 2024, 20:15

Type Values Removed Values Added
References
  • () https://news.ycombinator.com/item?id=39372384 -

14 Feb 2024, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-14 16:15

Updated : 2025-05-12 15:15

NVD link : CVE-2023-50387

Mitre link : CVE-2023-50387

JSON object : View

Products Affected

thekelleys

  • dnsmasq

redhat

  • enterprise_linux

nlnetlabs

  • unbound

fedoraproject

  • fedora

powerdns

  • recursor

microsoft

  • windows_server_2022_23h2
  • windows_server_2008
  • windows_server_2022
  • windows_server_2016
  • windows_server_2012
  • windows_server_2019

isc

  • bind

nic

  • knot_resolver
CWE
CWE-770

Allocation of Resources Without Limits or Throttling