#VU7141 Improper input validation in OpenVPN for Windows - CVE-2017-7522

Vulnerability identifier: #VU7141

Vulnerability risk: Low

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

CVE-ID: CVE-2017-7522

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenVPN for Windows
Client/Desktop applications / Software for system administration

Vendor: OpenVPN

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error when processing --x509-track attribute within mbedtls. A remote authenticated attacker can perform denial of service (DoS) attack.

Mitigation
Update OpenVPN to version 2.4.3.

Vulnerable software versions

OpenVPN for Windows: 2.4.0 - 2.4.2

---

External links
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24

---

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.