The remote Debian 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-2992 advisory.

  - OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability     when key-method 1 is used, possibly resulting in code execution. (CVE-2017-12166)

  - An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2     (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives     before the data channel crypto parameters have been initialized, the victim's connection will be dropped.
    This requires careful timing due to the small time window (usually within a few seconds) between the     victim client connection starting and the server PUSH_REPLY response back to the client. This attack will     only work if Negotiable Cipher Parameters (NCP) is in use. (CVE-2020-11810)

  - OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass authentication and access control     channel data on servers configured with deferred authentication, which can be used to potentially trigger     further information leaks. (CVE-2020-15078)

  - OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins     when more than one of them makes use of deferred authentication replies, which allows an external user to     be granted access with only partially correct credentials. (CVE-2022-0547)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Debian DLA-2992-1 : openvpn - LTS security update

critical Nessus Plugin ID 160475

Version 1.5

Version 1.4

Version 1.5 Oct 4, 2024, 11:19 AM IAVM reference Plugin Feed: 202410041119
Version 1.4 Oct 31, 2023, 1:53 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C". "CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") Exploit attributes ("Exploit available" set to "True". "Exploitability ease" changed from "No known exploits are available" to "Exploits are available") Plugin Feed: 202310311353