Statamic CMS remote code execution via front-end form uploads

Description

Impact

On front-end forms with an asset upload field, PHP files crafted to look like images may be uploaded regardless of mime validation rules. This only affects forms using the "Forms" feature and not just any arbitrary form. This does not affect the control panel.

Patches

It has been patched in 3.4.13 and 4.33.0.

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2023-11-12 15:57:58 UTC
Updated
2023-11-12 15:57:58 UTC
GitHub reviewed
2023-11-12 15:57:58 UTC
NVD published
2023-11-10

EPSS Score

Score Percentile
4.86% 89.50%

CVSS Scores

Base score Version Severity Vector
8.4 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

CWEs

CWE id Name
CWE-434 Unrestricted Upload of File with Dangerous Type

Credits

  • Cyber-Wo0dy (reporter)

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
composer statamic/cms >= 4.0.0, < 4.33.0 4.33.0
composer statamic/cms < 3.4.13 3.4.13

References

cvelogic Threat Intelligence