Vulnerability Name:

CVE-2021-3606 (CCN-204841)

Assigned:2021-07-01
Published:2021-07-01
Updated:2021-07-09
Summary:OpenVPN before version 2.5.3 on Windows allows local users to load arbitrary dynamic loadable libraries via an OpenSSL configuration file if present, which allows the user to run arbitrary code with the same privilege level as the main OpenVPN process (openvpn.exe).
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:4.4 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-427
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-3606

Source: MISC
Type: Vendor Advisory
https://community.openvpn.net/openvpn/wiki/CVE-2021-3606

Source: CCN
Type: OpenVPN Web site
CVE-2021-3606: OpenVPN 2.5.2 and earlier versions (Windows only) may load an external OpenSSL configuration file

Source: MISC
Type: Vendor Advisory
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements

Source: XF
Type: UNKNOWN
openvpn-cve20213606-code-exec(204841)

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openvpn:openvpn:*:*:*:*:*:*:*:* (Version < 2.5.3)
  • AND
  • cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:openvpn:openvpn:2.5.2:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    openvpn openvpn *
    microsoft windows -
    openvpn openvpn 2.5.2