Denial of service in Junos OS and Junos OS Evolved l2ald

1) Use-after-free

EUVDB-ID: #VU88487

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-30386

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in l2ald. A remote attacker on the local network can send specially crafted data to the device and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.4R1-S1 - 23.2R1-S2

Junos OS Evolved: 20.4R1-EVO - 22.4R1-S2-EVO

CPE2.3

• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R1-S1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R2-S1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R2-S2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S4:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S5:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S6:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S7:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:20.4R1-EVO:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-In-a-EVPN-VXLAN-scenario-state-changes-on-adjacent-systems-can-cause-an-l2ald-process-crash-CVE-2024-30386

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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