#VU49693 Path traversal in TOS - CVE-2020-28187

Vulnerability identifier: #VU49693

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

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

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

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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.