Arbitrary file upload in Craft CMS



Published: 2018-01-02
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-3814
CWE-ID CWE-434
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Craft CMS
Web applications / CMS

Vendor Pixel & Tonic, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Arbitrary file upload

EUVDB-ID: #VU9828

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2018-3814

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

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.


Mitigation

Install update from vendor's repository.

Vulnerable software versions

Craft CMS: 2.6.3000


CPE2.3 External links

http://github.com/Snowty/myCVE/blob/master/CraftCMS-2.6.3000/README.md

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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