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CVE Vulnerabilities

CVE-2023-50868

Uncontrolled Resource Consumption

Published: Feb 14, 2024 | Modified: Dec 23, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2023-50868
CWEhttps://cwe.mitre.org/data/definitions/400.html

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
BindIsc9.0.0 (including)9.16.48 (excluding)
BindIsc9.9.3 (including)9.16.48 (excluding)
BindIsc9.18.0 (including)9.18.24 (excluding)
BindIsc9.18.11 (including)9.18.24 (excluding)
BindIsc9.19.0 (including)9.19.21 (excluding)
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONRedHatbind-32:9.8.2-0.68.rc1.el6_10.14*
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONRedHatbind-dyndb-ldap-0:2.3-8.el6_10.1*
Red Hat Enterprise Linux 7RedHatbind-32:9.11.4-26.P2.el7_9.16*
Red Hat Enterprise Linux 7RedHatbind-dyndb-ldap-0:11.1-7.el7_9.1*
Red Hat Enterprise Linux 7RedHatdhcp-12:4.2.5-83.el7_9.2*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHatunbound-0:1.6.6-5.el7_9.1*
Red Hat Enterprise Linux 8RedHatunbound-0:1.16.2-5.el8_9.2*
Red Hat Enterprise Linux 8RedHatdnsmasq-0:2.79-31.el8_9.2*
Red Hat Enterprise Linux 8RedHatbind9.16-32:9.16.23-0.16.el8_9.2*
Red Hat Enterprise Linux 8RedHatbind-32:9.11.36-11.el8_9.1*
Red Hat Enterprise Linux 8RedHatbind-32:9.11.36-14.el8_10*
Red Hat Enterprise Linux 8RedHatbind-32:9.11.36-11.el8_9.1*
Red Hat Enterprise Linux 8RedHatbind-32:9.11.36-14.el8_10*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatunbound-0:1.7.3-12.el8_2.1*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatbind-32:9.11.13-6.el8_2.7*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatdhcp-12:4.3.6-40.el8_2.3*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatdnsmasq-0:2.79-11.el8_2.3*
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRedHatunbound-0:1.7.3-12.el8_2.1*
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRedHatunbound-0:1.7.3-12.el8_2.1*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatunbound-0:1.7.3-15.el8_4.1*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatbind-32:9.11.26-4.el8_4.4*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatdhcp-12:4.3.6-44.el8_4.3*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatdnsmasq-0:2.79-15.el8_4.2*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHatunbound-0:1.7.3-15.el8_4.1*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHatbind-32:9.11.26-4.el8_4.4*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHatdhcp-12:4.3.6-44.el8_4.3*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHatdnsmasq-0:2.79-15.el8_4.2*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHatunbound-0:1.7.3-15.el8_4.1*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHatbind-32:9.11.26-4.el8_4.4*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHatdhcp-12:4.3.6-44.el8_4.3*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHatdnsmasq-0:2.79-15.el8_4.2*
Red Hat Enterprise Linux 8.6 Extended Update SupportRedHatdnsmasq-0:2.79-21.el8_6.5*
Red Hat Enterprise Linux 8.6 Extended Update SupportRedHatbind9.16-32:9.16.23-0.7.el8_6.5*
Red Hat Enterprise Linux 8.6 Extended Update SupportRedHatunbound-0:1.7.3-17.el8_6.4*
Red Hat Enterprise Linux 8.6 Extended Update SupportRedHatbind-32:9.11.36-3.el8_6.7*
Red Hat Enterprise Linux 8.6 Extended Update SupportRedHatdhcp-12:4.3.6-47.el8_6.2*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatunbound-0:1.16.2-5.el8_8.1*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatdnsmasq-0:2.79-26.el8_8.4*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatbind9.16-32:9.16.23-0.14.el8_8.4*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatbind-32:9.11.36-8.el8_8.4*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHatdhcp-12:4.3.6-49.el8_8.1*
Red Hat Enterprise Linux 9RedHatunbound-0:1.16.2-3.el9_3.1*
Red Hat Enterprise Linux 9RedHatdnsmasq-0:2.85-14.el9_3.1*
Red Hat Enterprise Linux 9RedHatbind-32:9.16.23-14.el9_3.4*
Red Hat Enterprise Linux 9RedHatbind-dyndb-ldap-0:11.9-8.el9_3.3*
Red Hat Enterprise Linux 9RedHatbind-32:9.16.23-18.el9_4.1*
Red Hat Enterprise Linux 9RedHatbind-dyndb-ldap-0:11.9-9.el9_4*
Red Hat Enterprise Linux 9.0 Extended Update SupportRedHatdnsmasq-0:2.85-3.el9_0.1*
Red Hat Enterprise Linux 9.0 Extended Update SupportRedHatbind-32:9.16.23-1.el9_0.5*
Red Hat Enterprise Linux 9.0 Extended Update SupportRedHatbind-dyndb-ldap-0:11.9-7.el9_0.1*
Red Hat Enterprise Linux 9.0 Extended Update SupportRedHatunbound-0:1.13.1-13.el9_0.4*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHatunbound-0:1.16.2-3.el9_2.1*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHatdnsmasq-0:2.85-6.el9_2.3*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHatbind-32:9.16.23-11.el9_2.4*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHatbind-dyndb-ldap-0:11.9-8.el9_2.2*
Bind9Ubuntubionic*
Bind9Ubuntudevel*
Bind9Ubuntuesm-infra-legacy/trusty*
Bind9Ubuntuesm-infra/bionic*
Bind9Ubuntuesm-infra/focal*
Bind9Ubuntuesm-infra/xenial*
Bind9Ubuntufocal*
Bind9Ubuntujammy*
Bind9Ubuntumantic*
Bind9Ubuntunoble*
Bind9Ubuntuoracular*
Bind9Ubuntuplucky*
Bind9Ubuntuquesting*
Bind9Ubuntutrusty*
Bind9Ubuntutrusty/esm*
Bind9Ubuntuupstream*
Bind9Ubuntuxenial*
Bind9-libsUbuntufocal*
DnsmasqUbuntubionic*
DnsmasqUbuntudevel*
DnsmasqUbuntuesm-infra-legacy/trusty*
DnsmasqUbuntuesm-infra/bionic*
DnsmasqUbuntuesm-infra/focal*
DnsmasqUbuntuesm-infra/xenial*
DnsmasqUbuntufocal*
DnsmasqUbuntujammy*
DnsmasqUbuntumantic*
DnsmasqUbuntunoble*
DnsmasqUbuntuoracular*
DnsmasqUbuntuplucky*
DnsmasqUbuntuquesting*
DnsmasqUbuntutrusty*
DnsmasqUbuntutrusty/esm*
DnsmasqUbuntuupstream*
DnsmasqUbuntuxenial*
Isc-dhcpUbuntumantic*
Isc-dhcpUbuntuoracular*
Isc-dhcpUbuntuplucky*
Knot-resolverUbuntubionic*
Knot-resolverUbuntufocal*
Knot-resolverUbuntumantic*
Knot-resolverUbuntuupstream*
Knot-resolverUbuntuxenial*
Pdns-recursorUbuntubionic*
Pdns-recursorUbuntufocal*
Pdns-recursorUbuntumantic*
Pdns-recursorUbuntutrusty*
Pdns-recursorUbuntuupstream*
Pdns-recursorUbuntuxenial*
UnboundUbuntubionic*
UnboundUbuntudevel*
UnboundUbuntuesm-infra/focal*
UnboundUbuntufocal*
UnboundUbuntujammy*
UnboundUbuntumantic*
UnboundUbuntunoble*
UnboundUbuntuoracular*
UnboundUbuntuplucky*
UnboundUbuntuquesting*
UnboundUbuntutrusty*
UnboundUbuntutrusty/esm*
UnboundUbuntuupstream*
UnboundUbuntuxenial*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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