Article Detail

Product Affected

This issue affects Junos OS 21.2R3-S5, 21.4R3-S4, 22.2R3, 22.3R2, 22.4R1, 23.2R1. Affected platforms: MX240, MX480, MX960 platforms using MPC10E.

Severity

High

Severity Assessment (CVSS) Score

CVSS 3.1: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVSS 4.0: 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)

Problem

A Heap-based Buffer Overflow vulnerability in the telemetry sensor process (sensord) of Juniper Networks Junos OS on MX240, MX480, MX960 platforms using MPC10E causes a steady increase in memory utilization, ultimately leading to a Denial of Service (DoS).

When the device is subscribed to a specific subscription on Junos Telemetry Interface, a slow memory leak occurs and eventually all resources are consumed and the device becomes unresponsive. A manual reboot of the Line Card will be required to restore the device to its normal functioning.

This issue is only seen when telemetry subscription is active.

The Heap memory utilization can be monitored using the following command:
> show system processes extensive

The following command can be used to monitor the memory utilization of the specific sensor
> show system info | match sensord

   PID   NAME                 MEMORY     PEAK MEMORY    %CPU   THREAD-COUNT CORE-AFFINITY   UPTIME

   1986  sensord            877.57MB   877.57MB         2       4           0,2-15          7-21:41:32

This issue affects Junos OS:

from 21.2R3-S5 before 21.2R3-S7,
from 21.4R3-S4 before 21.4R3-S6,
from 22.2R3 before 22.2R3-S4,
from 22.3R2 before 22.3R3-S2,
from 22.4R1 before 22.4R3,
from 23.2R1 before 23.2R2.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

Solution

The following software releases have been updated to resolve this specific issue: 20.4R3-S10, 21.2R3-S7, 21.4R3-S6, 22.2R3-S3, 22.2R3-S4, 22.3R3-S2, 22.4R3, 23.2R2, 23.4R1, 23.4R2, and all subsequent releases.

This issue is being tracked as 1771284 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround

There are no known workarounds for this issue.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History