SB2018010205 - Arbitrary file upload in Craft CMS
Published: January 2, 2018
Security Bulletin ID
SB2018010205
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Arbitrary file upload (CVE-ID: CVE-2018-3814)
The vulnerability allows a remote attacker to execute arbitrary PHP code on the target system.The vulnerability exists due to insufficient validation of user-supplied data when uploading files via "Assets->Upload files" screen. A remote authenticated attacker can upload .jpg file with PHP code inside, then use the "Replace it" option to rename the file and add .php extension to it. As a result the uploaded PHP code will be executed on the server.
Remediation
Install update from vendor's website.