CVE Vulnerabilities

CVE-2018-16844

Uncontrolled Resource Consumption

Published: Nov 07, 2018 | 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
7.8 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C
RedHat/V2
RedHat/V3
5.3 MODERATE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Ubuntu
MEDIUM

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive CPU usage. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the http2 option of the listen directive is used in a configuration file.

Weakness

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

Affected Software

Name Vendor Start Version End Version
Nginx F5 1.9.5 (including) 1.14.1 (excluding)
Nginx F5 1.15.0 (including) 1.15.6 (excluding)
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat rh-nginx112-nginx-1:1.12.1-2.el7.1 *
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat rh-nginx114-nginx-1:1.14.1-1.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS RedHat rh-nginx112-nginx-1:1.12.1-2.el7.1 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS RedHat rh-nginx114-nginx-1:1.14.1-1.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS RedHat rh-nginx112-nginx-1:1.12.1-2.el7.1 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS RedHat rh-nginx114-nginx-1:1.14.1-1.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS RedHat rh-nginx112-nginx-1:1.12.1-2.el7.1 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS RedHat rh-nginx114-nginx-1:1.14.1-1.el7 *
Nginx Ubuntu bionic *
Nginx Ubuntu cosmic *
Nginx Ubuntu devel *
Nginx Ubuntu esm-infra/bionic *
Nginx Ubuntu esm-infra/xenial *
Nginx Ubuntu upstream *
Nginx Ubuntu xenial *

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