Vulnerability Name:

CVE-2020-15074 (CCN-185672)

Assigned:2020-07-02
Published:2020-07-02
Updated:2021-11-23
Summary:OpenVPN Access Server older than version 2.8.4 and version 2.9.5 generates new user authentication tokens instead of reusing exiting tokens on reconnect making it possible to circumvent the initial token expiry timestamp.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-613
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-15074

Source: XF
Type: UNKNOWN
openvpn-cve202015074-sec-bypass(185672)

Source: CCN
Type: OpenVPN Web site
Release notes for OpenVPN Access Server 2.8.5

Source: CONFIRM
Type: Release Notes, Vendor Advisory
https://openvpn.net/vpn-server-resources/release-notes/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:* (Version < 2.8.4)
  • OR cpe:/a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:* (Version >= 2.9.0 and < 2.9.6)

    • Configuration CCN 1:
  • cpe:/a:openvpn:openvpn:2.8.3:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    openvpn openvpn access server *
    openvpn openvpn access server *
    openvpn openvpn 2.8.3