The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is     completed before processing other requests. A customized SSH client can simply skip the authentication     step. (CVE-2018-7749)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is
    completed before processing other requests. A customized SSH client can simply skip the authentication
    step. (CVE-2018-7749)

The remote Ubuntu 18.04 ESM host has a package installed that is affected by a vulnerability as referenced in the USN-4854-1 advisory.

    Matthijs Kooijman discovered that AsyncSSH server did not properly handle authentication under certain     conditions. An attacker with a specially crafted client could use this vulnerability to skip     authentication of SSH sessions.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

mitre.org Reports :

The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests A customized SSH client can simply skip the authentication step.

ID	Name	Product	Family	Severity
254667	Linux Distros Unpatched Vulnerability : CVE-2018-7749	Nessus	Misc.	critical
432456	SCA: security update for AsyncSSH (GHSA-97cv-6pjf-5f9q)	Tenable Cloud Security	SCA Checks	critical
432456	SCA: security update for AsyncSSH (GHSA-97cv-6pjf-5f9q)	Tenable Self-Hosted Container Security	SCA Checks	critical
183148	Ubuntu 18.04 ESM : AsyncSSH vulnerability (USN-4854-1)	Nessus	Ubuntu Local Security Checks	critical
119510	FreeBSD : py-asyncssh -- Allows bypass of authentication (0e8f496a-b498-11e8-bdcf-74d435e60b7c)	Nessus	FreeBSD Local Security Checks	critical

Detections

Analytics

CVE-2018-7749

critical

Tenable Plugins

critical

critical

critical

critical

critical