Denial of service in Junos OS Evolved PFE

1) Improper handling of values

EUVDB-ID: #VU94347

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/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-2024-39531

CWE-ID: CWE-229 - Improper Handling of Values

Exploit availability: No

Description

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

The vulnerability exists due to improper handling of values error in the Packet Forwarding Engine (PFE). A remote non-authenticated attacker can cause a Denial-of-Service (DoS).

 If a value is configured for DDoS bandwidth or burst parameters for any protocol in a queue, all protocols which share the same queue will have their bandwidth or burst value changed to the new value.

If, for example, OSPF was configured with a certain bandwidth value, ISIS would also be limited to this value.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 21.4R1-EVO - 23.2R1-S2-EVO

CPE2.3

• cpe:2.3:o:juniper_networks:junos_os_evolved:21.4R3-S6-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.1R3-S5-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.2R3-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.3R3-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.4R3-S1-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:23.2R1-S2-EVO:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/s/article/2024-07-Security-Bulletin-Junos-OS-Evolved-ACX7000-Series-Protocol-specific-DDoS-configuration-affects-other-protocols-CVE-2024-39531

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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