CVE-2024-39542 Information

Jul 12, 2024 cve

Description

An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with MPC10/11 or LC9600 MX304 and Junos OS Evolved on ACX Series and PTX Series allows an unauthenticated network based attacker to cause a Denial-of-Service (DoS).

This issue can occur in two scenarios:

If a device which is configured with SFLOW and ECMP receives specific valid transit traffic which is subject to sampling the packetio process crashes which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. (This scenario is only applicable to PTX but not to ACX or MX.)
If a device receives a malformed CFM packet on an interface configured with CFM the packetio process crashes which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. Please note that the CVSS score is for the formally more severe issue 1.

The CVSS score for scenario 2. is: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

This issue affects Junos OS:

All versions before 21.2R3-S4
21.4 versions before 21.4R2
22.2 versions before 22.2R3-S2;

Junos OS Evolved:

All versions before 21.2R3-S8-EVO
21.4 versions before 21.4R2-EVO.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://supportportal.juniper.net/JSA83002

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5

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