#VU49695 Improper access control in TOS - CVE-2020-29189

Vulnerability identifier: #VU49695

Vulnerability risk: High

CVSSv4.0: 6.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-29189

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TOS
Client/Desktop applications / Other client software

Vendor: TerraMaster

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote authenticated attacker can bypass read-only restriction and obtain full access to any folder within the NAS.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TOS: 4.2.06

---

External links
https://terramaster.com
https://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/

---

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.