PT-2020-12625 · Openvpn · Openvpn Access Server

Published 2020-05-04 · Updated 2020-05-12 · CVE-2020-11462

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions OpenVPN Access Server versions 2.7.0 and earlier OpenVPN Access Server versions 2.8.x through 2.8.2

Description An issue was discovered in OpenVPN Access Server. With the full featured RPC2 interface enabled, it is possible to achieve a temporary DoS state of the management interface when sending an XML Entity Expansion (XEE) payload to the XMLRPC based RPC2 interface. The duration of the DoS state depends on available memory and CPU speed.

Recommendations For OpenVPN Access Server versions 2.7.0 and earlier, update to version 2.7.0 or later. For OpenVPN Access Server versions 2.8.x through 2.8.2, update to version 2.8.3 or later. As a temporary workaround, consider disabling the full featured RPC2 interface until a patch is available.

Fix

XML Entity Expansion

Weakness Enumeration

CWE-776

Related Identifiers

CVE-2020-11462

Affected Products

Openvpn Access Server

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2020-11462 · Security Note
• https://openvpn.net/vpn-server-resources/release-notes/#Release_notes_for_OpenVPN_Access_Server_283 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-11462 · Vendor Advisory
• https://t.me/cvenotify/3516 · Telegram Post