CVE Vulnerabilities

CVE-2020-15114

Uncontrolled Resource Consumption

Published: Aug 06, 2020 | Modified: Nov 21, 2024
CVSS 3.x
7.7
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS 2.x
4 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P
RedHat/V2
RedHat/V3
7.7 MODERATE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Ubuntu
MEDIUM

In etcd before versions 3.3.23 and 3.4.10, the etcd gateway is a simple TCP proxy to allow for basic service discovery and access. However, it is possible to include the gateway address as an endpoint. This results in a denial of service, since the endpoint can become stuck in a loop of requesting itself until there are no more available file descriptors to accept connections on the gateway.

Weakness

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

Affected Software

Name Vendor Start Version End Version
Etcd Redhat 3.3.0 (including) 3.3.23 (excluding)
Etcd Redhat 3.4.0 (including) 3.4.10 (excluding)
Etcd Ubuntu bionic *
Etcd Ubuntu esm-apps/bionic *
Etcd Ubuntu focal *
Etcd Ubuntu groovy *
Etcd Ubuntu hirsute *
Etcd Ubuntu trusty *
Etcd Ubuntu upstream *
Etcd Ubuntu xenial *
Red Hat OpenShift Container Platform 4.8 RedHat openshift4/ose-etcd:v4.8.0-202106152230.p0.git.aefa6bf.assembly.stream *
Red Hat OpenStack Platform 16.1 RedHat etcd-0:3.3.23-1.el8ost *

Extended Description

Limited resources include memory, file system storage, database connection pool entries, and CPU. If an attacker can trigger the allocation of these limited resources, but the number or size of the resources is not controlled, then the attacker could cause a denial of service that consumes all available resources. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system. There are at least three distinct scenarios which can commonly lead to resource exhaustion:

Resource exhaustion problems are often result due to an incorrect implementation of the following situations:

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