Vulnerability identifier: #VU51879

Vulnerability risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2020-2509

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
QNAP QTS
Server applications / File servers (FTP/HTTP)

Vendor: QNAP Systems, Inc.

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote unauthenticated attacker can send specially crafted HTTP request to port 8080/TCP and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QNAP QTS: 4.3.6.0805 20181228 - 4.3.6.1446 20200929

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External links
http://www.qnap.com/en/release-notes/qts/4.3.6.1620/20210322
http://securingsam.com/new-vulnerabilities-allow-complete-takeover/

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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?

Yes. This vulnerability is being exploited in the wild.