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Denial of Service (DoS) Affecting github.com/nats-io/nats-server/server package, versions <2.2.0

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 1.8% (88th percentile)
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NVD
7.5 high

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  • Snyk ID SNYK-GOLANG-GITHUBCOMNATSIONATSSERVERSERVER-1042967
  • published 7 Mar 2021
  • disclosed 22 Nov 2020
  • credit derekcollison
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Introduced: 22 Nov 2020

CVE-2020-28466 Open this link in a new tab
CWE-400 Open this link in a new tab
First added by Snyk

How to fix?

Upgrade github.com/nats-io/nats-server/server to version 2.2.0 or higher.

Overview

github.com/nats-io/nats-server/server is an A simple, secure and performant communications system for digital systems, services and devices.

Affected versions of this package are vulnerable to Denial of Service (DoS). Untrusted accounts are able to crash the server using configs that represent a service export/import cycles.

Disclaimer from the maintainers:

Running a NATS service which is exposed to untrusted users presents a heightened risk. Any remote execution flaw or equivalent seriousness, or denial-of-service by unauthenticated users, will lead to prompt releases by the NATS maintainers. Fixes for denial of service issues with no threat of remote execution, when limited to account holders, are likely to just be committed to the main development branch with no special attention. Those who are running such services are encouraged to build regularly from git.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package