Software Engineering Institute

The Vertiv Avocent UMG-4000 contains multiple vulnerabilities that could allow an authenticated attacker with administrative privileges to remotely execute arbitrary code. The web interface does not sanitize input provided from the remote client, making it vulnerable to command injection, stored cross-site scripting, and reflected cross-site scripting.

CVE-2019-9507 - CWE-95
The web interface of the Avocent UMG-4000 version 4.2.1.19 is vulnerable to command injection because the application incorrectly neutralizes code syntax before executing. Since all commands within the web application are executed as root, this could allow a remote attacker authenticated with an administrator account to execute arbitrary commands. The CVSS 2.0 score below is based on CVE-2019-9507.

CVE-2019-9508 - CWE-79
The web interface of the Avocent UMG-4000 version 4.2.1.19 is vulnerable to stored XSS. A remote attacker authenticated with an administrator account could store a maliciously named file within the web application that would execute each time a user browsed to the page.

CVE-2019-9509 - CWE-79
The web interface of the Avocent UMG-4000 version 4.2.1.19 is vulnerable to reflected XSS in an HTTP POST parameter. The web application does not neutralize user-controllable input before displaying to users in a web page, which could allow a remote attacker authenticated with a user account to execute arbitrary code.

An authenticated remote attacker could inject arbitrary scripts or persistently store malicious scripts on the web server that could be used to collect and exfiltrate sensitive information.

Apply an update

Vertiv Avocent has addressed these issues in the below versions:

Non-Trellis customers are encouraged to install Universal Management Gateway firmware version 4.2.2.21 or higher to address these vulnerabilities, located here.
Trellis users of the Universal Management Gateway running firmware version 4.2.0.23 that are operating Trellis versions 5.0.2 through 5.0.6 should install the update patch located here.
Trellis users of the Universal Management Gateway that are operating Trellis versions 5.0.6 and later should install Universal Gateway firmware version 4.3.0.23 located here.