Arbitrary File Deletion in HyperComments plugin for WordPress

1) Improper access control

EUVDB-ID: #VU47432

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the affected plugin does not validate and sanitise user input which is being concatenated to create a file path, passed to unlink(). A remote attacker can bypass implemented security restrictions and cause arbitrary file deletion.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

HyperComments: 1.0.0 - 1.2.1

External links

http://wpvulndb.com/vulnerabilities/10423/
http://lenonleite.com.br/en/2018/01/08/13-17-wordpress-plugins-with-over-150000-270000-active-downloads-with-the-same-security-issues/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.