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Insecure Deserialization in Backend User Settings in TYPO3 CMS

High severity GitHub Reviewed Published May 12, 2020 in TYPO3/typo3 • Updated Feb 5, 2024

Package

composer typo3/cms (Composer)

Affected versions

>= 10.0.0, < 10.4.2
>= 9.0.0, < 9.5.17

Patched versions

10.4.2
9.5.17
composer typo3/cms-core (Composer)
>= 9.0.0, < 9.5.17
>= 10.0.0, < 10.4.2
9.5.17
10.4.2

Description

It has been discovered that backend user settings (in $BE_USER->uc) are vulnerable to insecure deserialization. In combination with vulnerabilities of 3rd party components this can lead to remote code execution. A valid backend user account is needed to exploit this vulnerability.

Update to TYPO3 versions 9.5.17 or 10.4.2 that fix the problem described.

References

References

@ohader ohader published to TYPO3/typo3 May 12, 2020
Reviewed May 13, 2020
Published to the GitHub Advisory Database May 13, 2020
Last updated Feb 5, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.196%
(57th percentile)

Weaknesses

CVE ID

CVE-2020-11067

GHSA ID

GHSA-2wj9-434x-9hvp

Source code

No known source code

Credits

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