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Rewterz Threat Advisory – CVE-2021-3824 – OpenVPN Access Server Vulnerability

Severity

Medium

Analysis Summary

CVE-2021-3824

OpenVPN Access Server is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the web login page URL. A remote attacker could exploit this vulnerability using a specially-crafted URL to execute script in a victim’s Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim’s cookie-based authentication credentials.

Impact

  • Cross-Site Scripting

Affected Vendors

  • OpenVPN

Affected Products

  • OpenVPN Access Server 2.9.0
  • OpenVPN Access Server 2.9.1
  • OpenVPN Access Server 2.9.2
  • OpenVPN Access Server 2.9.3
  • OpenVPN Access Server 2.9.4

Remediation

Upgrade to the latest version of OpenVPN Access Server, available from the OpenVPN Web site.

Access Server Release Notes