Local denial of service in Junos OS and Junos OS Evolved rpd

1) Use of uninitialized resource

EUVDB-ID: #VU78263

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36836

CWE-ID: CWE-908 - Use of Uninitialized Resource

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (Dos) attack.

The vulnerability exists due to usage of uninitialized resources in a Multicast only Fast Reroute (MoFRR) scenario within the routing protocol daemon (rpd). A local user can trigger an uninitialized usage of resources by executing a specific low privileged CLI command and crash the rpd daemon.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.4 - 22.2R1-S1-EVO

Juniper Junos OS: 19.4 - 22.2R1-S2

External links

http://supportportal.juniper.net/s/article/2023-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-In-a-MoFRR-scenario-an-rpd-core-may-be-observed-when-a-low-privileged-CLI-command-is-executed-CVE-2023-36836

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.