Vulnerability identifier: #VU54931

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21804

CWE-ID: CWE-98

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
R-SeeNet
Server applications / Other server solutions

Vendor: Advantech Co., Ltd

Description

The vulnerability allows a remote attacker to include and execute arbitrary PHP files on the server.

The vulnerability exists due to incorrect input validation when including PHP files in the "sub_opt" parameter in the options.php script functionality. A remote attacker can send a specially crafted HTTP request to the affected application, include and execute arbitrary PHP code on the system with privileges of the web server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

R-SeeNet: 2.4.12

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External links
http://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1273

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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.