#VU52762 Command Injection in QNAP QTS - CVE-2021-28800

Vulnerability identifier: #VU52762

Vulnerability risk: High

CVSSv4.0: 8.1 [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:U/U:Amber]

CVE-ID: CVE-2021-28800

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: No

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

Vendor: QNAP Systems, Inc.

Description

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

The vulnerability exists due to improper input validation. A remote unauthenticated attacker can pass specially crafted data to the application and execute arbitrary commands on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QNAP QTS: 4.3.3 20170516 - 4.3.6.1620 20210322, 4.5.1.1456 20201015 - 4.5.2.1630 20210406

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External links
https://www.qnap.com/en/release-notes/qts/4.5.3.1652/20210428
https://www.qnap.com/en/security-advisory/qsa-21-28

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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.