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Denial of Service in Page Error Handling

Moderate
ohader published GHSA-4p9g-qgx9-397p Mar 16, 2021

Package

composer typo3/cms-core (Composer)

Affected versions

9.0.0-9.5.24, 10.0.0-10.4.13, 11.0.0-11.1.0

Patched versions

9.5.25, 10.4.14, 11.1.1

Description

Meta

  • CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C (5.5)
  • CWE-405, CWE-674
  • Status: DRAFT

Problem

Requesting invalid or non-existing resources via HTTP triggers the page error handler which again could retrieve content to be shown as error message from another page. This leads to a scenario in which the application is calling itself recursively - amplifying the impact of the initial attack until the limits of the web server are exceeded.

Solution

Update to TYPO3 versions 9.5.25, 10.4.14, 11.1.1 that fix the problem described.

Credits

Thanks to Paul Keller, Mathias Bolt Lesniak and Kay Strobach who reported this issue and to TYPO3 framework merger Frank Nägler and to TYPO3 security team member Torben Hansen who fixed the issue.

References

Severity

Moderate

CVE ID

CVE-2021-21359

Weaknesses

Asymmetric Resource Consumption (Amplification)

The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is asymmetric. Learn more on MITRE.

Uncontrolled Recursion

The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Learn more on MITRE.

Credits