CVE-2024-39536 Information

Description

A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a

Denial-of-Service (DoS).

When a BFD session configured with authentication flaps ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.

Whether the leak occurs can be monitored with the following CLI command:

show ppm request-queue

FPC     Pending-request fpc0                   2 request-total-pending: 2

where a continuously increasing number of pending requests is indicative of the leak. 

This issue affects:

Junos OS:

All versions before 21.2R3-S8
21.4 versions before 21.4R3-S7
22.1 versions before 22.1R3-S4
22.2 versions before 22.2R3-S4 
22.3 versions before 22.3R3
22.4 versions before 22.4R2-S2 22.4R3
23.1 versions before 23.1R2.

Junos OS Evolved: All versions before 21.2R3-S8-EVO 21.4-EVO versions before 21.4R3-S7-EVO 22.2-EVO versions before 22.2R3-S4-EVO 22.3-EVO versions before 22.3R3-EVO 22.4-EVO versions before 22.4R3-EVO 23.2-EVO versions before 23.2R1-EVO.

CVSS Vector

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

Reference

https://supportportal.juniper.net/JSA82996

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.3