CVE-2023-28973 : Security Advisory and Response

This CVE-2023-28973 pertains to an Improper Authorization vulnerability in the 'sysmanctl' shell command of Juniper Networks Junos OS Evolved, which allows a local, authenticated attacker to execute administrative commands that could impact the system's integrity or availability.

Understanding CVE-2023-28973

This vulnerability allows a local user to gain access to some administrative actions within the Junos OS Evolved through the 'sysmanctl' shell command.

What is CVE-2023-28973?

The CVE-2023-28973 vulnerability in Junos OS Evolved enables an authenticated attacker to execute administrative commands, such as daemon restarting, routing engine (RE) switchover, and node shutdown, via the 'sysmanctl' command. Access to this command is restricted to the Junos shell, with no direct or indirect access from the Junos CLI.

The Impact of CVE-2023-28973

Exploitation of this vulnerability could lead to unauthorized execution of critical administrative functions, potentially compromising the integrity and availability of the system.

Technical Details of CVE-2023-28973

This section delves into the specifics of the vulnerability, its affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability lies in the 'sysmanctl' shell command in Junos OS Evolved, allowing unauthorized administrative actions to be executed by a local, authenticated attacker.

Affected Systems and Versions

Juniper Networks Junos OS Evolved versions prior to 20.4R3-S5-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-S2-EVO, and 21.4R2-EVO are impacted by this vulnerability.

Exploitation Mechanism

The 'sysmanctl' command can be exploited by an authenticated attacker within the Junos shell to perform unauthorized administrative functions, potentially leading to system compromise.

Mitigation and Prevention

Understanding how to mitigate and prevent exploitation of this vulnerability is crucial for maintaining system security.

Immediate Steps to Take

To mitigate the risk posed by CVE-2023-28973, it is recommended to limit access to the Junos shell only to trusted system administrators through the use of command authorization.

Long-Term Security Practices

Implementing a robust access control policy and regularly reviewing and updating user privileges can help prevent unauthorized access and exploitation of vulnerabilities such as CVE-2023-28973.

Patching and Updates

Juniper Networks has released updated software versions to address this specific vulnerability. Users are advised to update to the following releases: Junos OS Evolved 20.4R3-S5-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-S2-EVO, 21.4R2-EVO, 22.1R1-EVO, and all subsequent releases.