Skip to content

Unrestricted file uploads in Contao

High severity GitHub Reviewed Published Dec 17, 2019 in contao/contao • Updated May 2, 2024

Package

composer contao/contao (Composer)

Affected versions

>= 4.0.0, < 4.4.46
>= 4.5.0, < 4.8.6

Patched versions

4.4.46
4.8.6
composer contao/core-bundle (Composer)
>= 4.0.0, < 4.4.46
>= 4.5.0, < 4.8.6
4.4.46
4.8.6

Description

Impact

A back end user with access to the form generator can upload arbitrary files and execute them on the server.

Patches

Update to Contao 4.4.46 or 4.8.6.

Workarounds

Configure your web server so it does not execute PHP files and other scripts in the Contao file upload directory.

References

https://contao.org/en/security-advisories/unrestricted-file-uploads

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 Dec 17, 2019
Published by the National Vulnerability Database Dec 17, 2019
Reviewed Dec 17, 2019
Published to the GitHub Advisory Database Dec 17, 2019
Last updated May 2, 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

0.099%
(43rd percentile)

Weaknesses

CVE ID

CVE-2019-19745

GHSA ID

GHSA-wjx8-cgrm-hh8p

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.