CVE-2024-47493 Information

Description

A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of the Juniper Networks Junos OS on the SRX5K SRX4600 and MX Series platforms with Trio-based FPCs allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).

In case of channelized Modular Interface Cards (MICs) every physical interface flap operation will leak heap memory. Over a period of time continuous physical interface flap operations causes local FPC to eventually run out of memory and crash.  

Below CLI command can be used to check the memory usage over a period of time:

??user@host> show chassis fpc

                Temp CPU Utilization (%)   CPU Utilization (%) Memory   Utilization (%)   Slot State     (C)  Total  Interrupt     1min   5min   15min DRAM (MB) Heap     Buffer

  0 Online       43     41         2                           2048       49         14

  1 Online       43     41         2                           2048       49         14

  2 Online       43     41         2                           2048       49         14

This issue affects Junos OS on SRX5K SRX4600 and MX Series: 

All versions before 21.2R3-S7 
from 21.4 before 21.4R3-S6 
from 22.1 before 22.1R3-S5 
from 22.2 before 22.2R3-S3 
from 22.3 before 22.3R3-S2 
from 22.4 before 22.4R3 
from 23.2 before 23.2R2 
from 23.4 before 23.4R2.

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/ https://www.juniper.net/documentation/us/en/software/junos/interfaces-link-multilink/topics/topic-map/link-multilink-services-understanding.html#id-multilink-interfaces-on-channelized-mics-overview

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