Denial of Service (DoS) The advisory has been revoked - it doesn't affect any version of package nokogiri Open this link in a new tab


    Threat Intelligence

    EPSS 2.17% (90th percentile)
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NVD
7.5 high

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  • Snyk ID SNYK-RUBY-NOKOGIRI-20268
  • published 6 Jun 2016
  • disclosed 13 Apr 2016
  • credit Unknown

How to fix?

Upgrade nokogiri to version 1.6.8 or higher.

Overview

nokogiri is an HTML, XML, SAX, and Reader parser, with the ability to search documents via XPath or CSS3 selectors.

Affected versions of this package are vulnerable to Denial of Services (DoS) attacks. Nokogiri is affected by series of vulnerabilities in libxml2 and libxslt, which are libraries Nokogiri depends on. It was discovered that libxml2 and libxslt incorrectly handled certain malformed documents, which can allow attackers to perform a Denial of Service or Arbitrary Code Execution attacks.

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