CVE-2024-30378 Information

Description

A Use After Free vulnerability in command processing of Juniper Networks Junos OS on MX Series allows a local authenticated attacker to cause the broadband edge service manager daemon (bbe-smgd) to crash upon execution of specific CLI commands creating a Denial of Service (DoS) condition.  The process crashes and restarts automatically.

When specific CLI commands are executed the bbe-smgd daemon attempts to write into an area of memory (mgd socket) that was already closed causing the process to crash.  This process manages and controls the configuration of broadband subscriber sessions and services.  While the process is unavailable additional subscribers will not be able to connect to the device causing a temporary Denial of Service condition.

This issue only occurs if Graceful Routing Engine Switchover (GRES) and Subscriber Management are enabled. This issue affects Junos OS:

All versions before 20.4R3-S5 
from 21.1 before 21.1R3-S4 
from 21.2 before 21.2R3-S3 
from 21.3 before 21.3R3-S5 
from 21.4 before 21.4R3-S5 
from 22.1 before 22.1R3 
from 22.2 before 22.2R3 
from 22.3 before 22.3R2;

CVSS Vector

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

Reference

https://supportportal.juniper.net/JSA79109 https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5