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Product Affected

This issue affects all versions of Junos OS and Junos OS Evolved.

Severity

Medium

Severity Assessment (CVSS) Score

CVSS: v3.1: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CVSS: v4.0: 6.8 (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)

Problem

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged attacker to cause a Denial-of-Service (DoS).

When a specific "show bgp neighbor" CLI command is run, the rpd cpu utilization rises and eventually causes a crash and restart. Repeated use of this command will cause a sustained DoS condition.

The device is only affected if BGP RIB sharding and update-threading is enabled.

This issue affects Junos OS:

All versions before 21.2R3-S9,
from 21.4 before 21.4R3-S8,
from 22.2 before 22.2R3-S6,
from 22.4 before 22.4R3-S2,
from 23.2 before 23.2R2-S3,
from 23.4 before 23.4R2.

and Junos OS Evolved:

All versions before 21.2R3-S9-EVO,
from 21.4-EVO before 21.4R3-S8-EVO,
from 22.2-EVO before 22.2R3-S6-EVO,
from 22.4-EVO before 22.4R3-S2-EVO,
from 23.2-EVO before 23.2R2-S3-EVO,
from 23.4-EVO before 23.4R2-EVO.

The following configuration is required on the device for it to be affected:

[ system processes routing bgp rib-sharding ] [ system processes routing bgp update-threading ]

Solution

The following software releases have been updated to resolve this specific issue:
Junos OS Evolved: 21.2R3-S9-EVO, 21.4R3-S8-EVO, 22.2R3-S6-EVO, 22.4R3-S2-EVO, 23.2R2-S3-EVO, 23.4R2-EVO, 24.2R1-EVO.
Junos OS: 21.2R3-S9, 21.4R3-S8, 22.2R3-S6, 22.4R3-S2, 23.2R2-S3, 23.4R2, 24.2R1, and all subsequent releases.

This issue is being tracked as 1797777 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.
Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

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