CVE-2023-36836

/// Technical description

A Use of an Uninitialized Resource vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, authenticated attacker with low privileges to cause a Denial of Service (DoS).

On all Junos OS and Junos OS Evolved platforms, in a Multicast only Fast Reroute (MoFRR) scenario, the rpd process can crash when a a specific low privileged CLI command is executed. The rpd crash will impact all routing protocols until the process has automatically been restarted. As the operational state which makes this issue exploitable is outside the attackers control, this issue is considered difficult to exploit. Continued execution of this command will lead to a sustained DoS.

This issue affects:

Juniper Networks Junos OS

19.4 version 19.4R3-S5 and later versions prior to 19.4R3-S9;

20.1 version 20.1R2 and later versions;

20.2 versions prior to 20.2R3-S7;

20.3 versions prior to 20.3R3-S5;

20.4 versions prior to 20.4R3-S6;

21.1 versions prior to 21.1

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References