Description

CodeIgniter4's ImageMagick Handler has Command Injection Vulnerability

Impact

This vulnerability affects applications that:

Use the ImageMagick handler for image processing (imagick as the image library)

AND either:

Allow file uploads with user-controlled filenames and process uploaded images using the resize() method

OR use the text() method with user-controlled text content or options

An attacker can:

Upload a file with a malicious filename containing shell metacharacters that get executed when the image is processed

OR provide malicious text content or options that get executed when adding text to images

Patches

Upgrade to v4.6.2 or later.

Workarounds

Switch to the GD image handler (gd, the default handler), which is not affected by either vulnerability

For file upload scenarios: Instead of using user-provided filenames, generate random names to eliminate the attack vector with getRandomName() when using the move() method, or use the store() method, which automatically generates safe filenames

For text operations: If you must use ImageMagick with user-controlled text, sanitize the input to only allow safe characters: preg_replace('/[^a-zA-Z0-9\s.,!?-]/', '', $text) and validate/restrict text options

References

OWASP Command Injection Prevention

CWE-78: OS Command Injection

Mitigation

Aliases

References