Vulnerabilities
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CVE Vulnerabilities

CVE-2020-12662

Uncontrolled Resource Consumption

Published: May 19, 2020 | Modified: Nov 21, 2024
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
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
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-2020-12662
CWEhttps://cwe.mitre.org/data/definitions/400.html

Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an NXNSAttack issue. This is triggered by random subdomains in the NSDNAME in NS records.

Weakness

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

Affected Software

NameVendorStart VersionEnd Version
UnboundNlnetlabs*1.10.1 (excluding)
Red Hat Enterprise Linux 6RedHatunbound-0:1.4.20-29.el6_10.1*
Red Hat Enterprise Linux 7RedHatunbound-0:1.6.6-4.el7_8*
Red Hat Enterprise Linux 7.7 Extended Update SupportRedHatunbound-0:1.6.6-2.el7_7*
Red Hat Enterprise Linux 8RedHatunbound-0:1.7.3-11.el8_2*
Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsRedHatunbound-0:1.7.3-9.el8_0*
Red Hat Enterprise Linux 8.1 Extended Update SupportRedHatunbound-0:1.7.3-9.el8_1*
UnboundUbuntubionic*
UnboundUbuntueoan*
UnboundUbuntuesm-infra-legacy/trusty*
UnboundUbuntuesm-infra/bionic*
UnboundUbuntuesm-infra/focal*
UnboundUbuntuesm-infra/xenial*
UnboundUbuntufocal*
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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