QNAP QES update for Ishell

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU39135

Risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-6903

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to execute arbitrary code.

lshell 0.9.16 allows remote authenticated users to break out of a limited shell and execute arbitrary commands.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QNAP QES: 2.0.0 build 20180206 - 2.1.1 Build 20200811

External links

http://www.qnap.com/en/security-advisory/qsa-20-18

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?

No. We are not aware of malware exploiting this vulnerability.