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Privilege escalation via form generator

High severity GitHub Reviewed Published Aug 11, 2021 in contao/contao • Updated Apr 22, 2024

Package

composer contao/contao (Composer)

Affected versions

>= 4.0.0, < 4.4.56
>= 4.5.0, < 4.9.18
>= 4.10.0, < 4.11.7

Patched versions

4.4.56
4.9.18
4.11.7
composer contao/core-bundle (Composer)
>= 4.0.0, < 4.4.56
>= 4.5.0, < 4.9.18
>= 4.10.0, < 4.11.7
4.4.56
4.9.18
4.11.7

Description

Impact

It is possible for untrusted users to gain administrator rights with the form generator.

Installations are only affected if there are untrusted back end users with access to the form generator.

Patches

Update to Contao 4.4.56, 4.9.18 or 4.11.7.

Workarounds

Disable the form generator or disable the login for untrusted back end users.

References

https://contao.org/en/security-advisories/privilege-escalation-with-the-form-generator

For more information

If you have any questions or comments about this advisory, open an issue in contao/contao.

References

@leofeyer leofeyer published to contao/contao Aug 11, 2021
Published by the National Vulnerability Database Aug 11, 2021
Reviewed Aug 23, 2021
Published to the GitHub Advisory Database Aug 23, 2021
Last updated Apr 22, 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
High
Privileges required
High
User interaction
None
Scope
Changed
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:H/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS score

0.104%
(44th percentile)

Weaknesses

CVE ID

CVE-2021-37627

GHSA ID

GHSA-hq5m-mqmx-fw6m

Source code

Credits

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