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Denial of Service (DoS) Affecting github.com/golang/net/html package, versions <0.0.0-20210520170846-37e1c6afe023

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.15% (51st percentile)
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NVD
7.5 high
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Red Hat
7.5 high

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  • Snyk ID SNYK-GOLANG-GITHUBCOMGOLANGNETHTML-1296323
  • published 23 May 2021
  • disclosed 20 May 2021
  • credit OSS Fuzz
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Introduced: 20 May 2021

CVE-2021-33194 Open this link in a new tab
CWE-400 Open this link in a new tab

How to fix?

Upgrade github.com/golang/net/html to version 0.0.0-20210520170846-37e1c6afe023 or higher.

Overview

github.com/golang/net/html is a package that implements an HTML5-compliant tokenizer and parser.

Affected versions of this package are vulnerable to Denial of Service (DoS) via a crafted input that causes ParseFragment to enter an infinite loop.

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