Zero-day vulnerability in jQuery File Upload

Arbitrary file upload
CVE-2018-9206

The vulnerability is publicly known since at least 2015.

Vulnerability details

Advisory: SB2018101901 - Arbitrary file upload in jQuery File Upload plugin

Vulnerable component: jQuery File Upload

CVE-ID: CVE-2018-9206

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

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

Description:

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists in the plugin's source code that handles file uploads to PHP servers due to software allows upload of arbitrary files to the system. A remote unauthenticated attacker can upload arbitrary .htaccess file to impose security restrictions to its upload folder and upload backdoors and web shells.

Note: The vulnerability has been actively exploited for at least 3 years.

Public Exploits:

- blueimp's jQuery 9.22.0 - (Arbitrary) File Upload (Metasploit) [Exploit-DB]

- jQuery-File-Upload 9.22.0 - Arbitrary File Upload [Exploit-DB]

- Blueimp's jQuery File Upload 9.22.0 - Arbitrary File Upload Exploit [Exploit-DB]

External links:

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.