Vulnerability identifier: #VU50865

Vulnerability risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2021-27328

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
NeoGate TG400
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Yeastar

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 the "1404" parameter. A remote authenticated attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

NeoGate TG400: 91.3.0.3

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External links
http://yeastar.com
http://github.com/SQSamir/CVE-2021-27328

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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. However, proof of concept for this vulnerability is available.