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October CMS Safe Mode bypass leads to authenticated Remote Code Execution

High severity GitHub Reviewed Published Oct 13, 2022 in octobercms/october • Updated Jan 29, 2023

Package

composer october/system (Composer)

Affected versions

>= 3.0.0, < 3.0.66
>= 2.0.0, < 2.2.34

Patched versions

3.0.66
2.2.34

Description

Impact

This vulnerability only affects installations that rely on the safe mode restriction, commonly used when providing public access to the admin panel. Assuming an attacker has access to the admin panel and permission to open the "Editor" section, they can bypass the Safe Mode (cms.safe_mode) restriction to introduce new PHP code in a CMS template using a specially crafted request.

Patches

The issue has been patched in v2.2.34 and v3.0.66

References

Credits to:

  • David Miller

For more information

If you have any questions or comments about this advisory:

References

@daftspunk daftspunk published to octobercms/october Oct 13, 2022
Published to the GitHub Advisory Database Oct 13, 2022
Reviewed Oct 13, 2022
Published by the National Vulnerability Database Oct 13, 2022
Last updated Jan 29, 2023

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
High
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:H/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.102%
(43rd percentile)

Weaknesses

CVE ID

CVE-2022-35944

GHSA ID

GHSA-x4q7-m6fp-4v9v

Source code

Credits

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