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Denial of Service (DoS) Affecting typo3/cms-core package, versions >=11.0.0, <11.1.1 >=10.0.0, <10.4.14 >=9.0.0, <9.5.25

0.0
medium

Snyk CVSS

    Attack Complexity High
    Availability High

    Threat Intelligence

    EPSS 0.18% (55th percentile)
Expand this section
NVD
7.5 high

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  • Snyk ID SNYK-PHP-TYPO3CMSCORE-1086572
  • published 18 Mar 2021
  • disclosed 17 Mar 2021
  • credit Paul Keller, Mathias Bolt Lesniak, Kay Strobach
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Introduced: 17 Mar 2021

CVE-2021-21359 Open this link in a new tab
CWE-400 Open this link in a new tab

How to fix?

Upgrade typo3/cms-core to version 11.1.1, 10.4.14, 9.5.25 or higher.

Overview

typo3/cms-core is a free open source enterprise content management system.

Affected versions of this package are vulnerable to Denial of Service (DoS). Requesting invalid or non-existing resources via HTTP triggers the page error handler which could retrieve content to be shown as an error message from another page. This leads to a scenario in which the application is calling itself recursively.

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