ClipBucket v5 before 5.5.3-#182 contains a file upload vulnerability that allows authenticated users to achieve remote code execution by uploading a PHP file with valid image magic bytes through the photo upload endpoint. The FileUpload::manageFile() function in fileupload.class.php fails to update the file extension after MIME validation, allowing an attacker-controlled .php extension to persist on disk and execute as PHP via PHP-FPM when the uploaded file is retrieved.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/MacWarrior/clipbucket-v5/commit/61cce55ab26ef88fb782dfde47b4…
disclosure@vulncheck.com
https://github.com/MacWarrior/clipbucket-v5/releases/tag/5.5.3-%23182
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/clipbucket-remote-code-execution-via-photo…
disclosure@vulncheck.com