#VU71738 Improper Authorization in Apex One - CVE-2023-0587

Vulnerability identifier: #VU71738

Vulnerability risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-0587

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Trend Micro

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to missing authorization when processing file uploads at the " /officescan/console/html/cgi/fcgiOfcDDA.exe" URL. A remote non-authenticated attacker can send a specially crafted HTTP PUT request with a malformed Content-Length header, upload an arbitrary number of large files to the SampleSubmission directory (i.e., \\PCCSRV\\TEMP\\SampleSubmission) and consume all available disk space, causing a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apex One: CP B2049 - 2019

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External links
https://www.tenable.com/security/research/tra-2023-5
https://files.trendmicro.com/documentation/readme/Apex%20One/2020/apex_one_2019_win_sp_b11564_EN_service_pack_Readme.html
https://success.trendmicro.com/dcx/s/solution/000292183?language=en_US
https://success.trendmicro.com/dcx/s/solution/000292209?language=en_US

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