#VU94351 Improper input validation in Junos OS Evolved - CVE-2024-39513

Vulnerability identifier: #VU94351

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-39513

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Junos OS Evolved
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

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

The vulnerability exists due to improper input validation error in the Packet Forwarding Engine (PFE). A local user can cause a Denial of Service (DoS).

When a specific "clear" command is run, the Advanced Forwarding Toolkit manager (evo-aftmand-bt or evo-aftmand-zx) crashes and restarts.

The crash impacts all traffic going through the FPCs, causing a DoS.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.4R1-EVO - 20.4R3-S8-EVO, 21.2-EVO - 21.2R3-S6-EVO, 21.3-EVO - 21.3R3-S4-EVO, 21.4R1-EVO - 21.4R3-S5-EVO, 22.1-EVO - 22.1R3-S3-EVO, 22.2-EVO - 22.2R3-S2-EVO, 22.3R1-EVO - 22.3R3-S2-EVO, 22.4R1-EVO - 22.4R2-S2-EVO, 23.2R1-EVO - 23.2R1-S2-EVO

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External links
https://supportportal.juniper.net/s/article/2024-07-Security-Bulletin-Junos-OS-Evolved-Execution-of-a-specific-CLI-command-will-cause-a-crash-in-the-AFT-manager-CVE-2024-39513

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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.