#VU55408 Arbitrary file upload in Apex One - CVE-2021-36741

Vulnerability identifier: #VU55408

Vulnerability risk: Critical

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2021-36741

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apex One
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Trend Micro

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload within the product’s management console . A remote user can upload a malicious file and execute it on the server.

Note, the vulnerability is being actively exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apex One: CP B2049 - 2019

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External links
https://success.trendmicro.com/solution/000287819
https://files.trendmicro.com/documentation/readme/Apex%20One/2020/apex_one_2019_win_en_criticalpatch_b9601_EN_Readme.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.