Vulnerability identifier: #VU49693

Vulnerability risk: Medium

CVSSv3.1: 5.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-28187

CWE-ID: CWE-22

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 perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences within several parameters. A remote authenticated attacker can send a specially crafted HTTP request and read, edit or delete any file within the filesystem.

This vulnerability affects the following parameters:

• "filename" in /tos/index.php?editor/fileGet
• "Event" in /include/ajax/logtable.php,
• "opt" in /include/core/index.php

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TOS: 4.2.06

---

External links
http://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/
http://www.terra-master.com/

---

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.