Multiple path traversal vulnerabilities in DrayTek VigorConnect

Published: 2021-10-13 | Updated: 2024-09-03

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-20124 CVE-2021-20123
CWE-ID	CWE-22
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild. Vulnerability #2 is being exploited in the wild.
Vulnerable software	VigorConnect Server applications / Remote management servers, RDP, SSH
Vendor	DrayTek Corp.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Path traversal

EUVDB-ID: #VU96749

Risk: High

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-20124

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

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 in the file download functionality of the WebServlet endpoint. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

VigorConnect: 1.1.0 - 1.6.0

CPE2.3

External links

https://www.tenable.com/security/research/tra-2021-42

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.

2) Path traversal

EUVDB-ID: #VU96748