#VU77848 Man-in-the-Middle (MitM) attack in SoftEther VPN - CVE-2023-32634

Vulnerability identifier: #VU77848

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-32634

CWE-ID: CWE-300

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SoftEther VPN
Server applications / Remote access servers, VPN

Vendor: SoftEther VPN Project

Description

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to using insecure protocols. A remote attacker can perform a man-in-the-middle attack on communication between the administrator and the VPN Client process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SoftEther VPN: 4.41 9787

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External links
https://jvn.jp/en/jp/JVN64316789/index.html
https://www.softether.org/9-about/News/904-SEVPN202301

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.