CVE-2024-39557 Information

Description

An Uncontrolled Resource Consumption vulnerability in the

Layer 2 Address Learning Daemon (l2ald)

of Juniper Networks Junos OS Evolved allows an unauthenticated adjacent attacker to cause a memory leak eventually exhausting all system memory leading to a system crash and Denial of Service (DoS).

Certain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit the issue will result in a system crash and restart.

To identify the issue execute the CLI command:

user@device> show platform application-info allocations app l2ald-agent EVL Object Allocation Statistics:

Node   Application     Context Name                               Live   Allocs   Fails     Guids re0   l2ald-agent               net::juniper::rtnh::L2Rtinfo       1069096 1069302   0         1069302 re0   l2ald-agent               net::juniper::rtnh::NHOpaqueTlv     114     195       0         195

This issue affects Junos OS Evolved:

All versions before 21.4R3-S8-EVO

from 22.2-EVO before 22.2R3-S4-EVO 
from 22.3-EVO before 22.3R3-S3-EVO 
from 22.4-EVO before 22.4R3-EVO 
from 23.2-EVO before 23.2R2-EVO.

CVSS Vector

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

Reference

https://supportportal.juniper.net/JSA83017

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

6.5