Arbitrary file upload in SG Optimizer plugin for WordPress

1) Improper access control

EUVDB-ID: #VU18080

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: N/A

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to upload arbitrary file to the server.

The vulnerability exists due to incorrect implementation of access permissions within the RESTFull API callback. A remote attacker can upload and execute arbitrary .php file on the system.

Successful exploitation of the vulnerability will result in system compromise.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SG Optimizer: 5.0.0 - 5.0.12

CPE2.3

• cpe:2.3:a:siteground:sg-cachepress:5.0.0:*:*:*:*:wordpress:*:*
• cpe:2.3:a:siteground:sg-cachepress:5.0.1:*:*:*:*:wordpress:*:*
• cpe:2.3:a:siteground:sg-cachepress:5.0.2:*:*:*:*:wordpress:*:*

External links

https://blog.sucuri.net/2019/03/vulnerability-disclosure-siteground-optimizer-caldera-forms.html
https://wpvulndb.com/vulnerabilities/9233/

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. However, proof of concept for this vulnerability is available.