CVE Vulnerabilities

CVE-2024-21600

Improper Neutralization of Equivalent Special Elements

Published: Jan 12, 2024 | Modified: Nov 21, 2024
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu

An Improper Neutralization of Equivalent Special Elements vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on PTX Series allows a unauthenticated, adjacent attacker to cause a Denial of Service (DoS).

When MPLS packets are meant to be sent to a flexible tunnel interface (FTI) and if the FTI tunnel is down, these will hit the reject NH, due to which the packets get sent to the CPU and cause a host path wedge condition. This will cause the FPC to hang and requires a manual restart to recover.

Please note that this issue specifically affects PTX1000, PTX3000, PTX5000 with FPC3, PTX10002-60C, and PTX10008/16 with LC110x. Other PTX Series devices and Line Cards (LC) are not affected.

The following log message can be seen when the issue occurs:

Cmerror Op Set: Host Loopback: HOST LOOPBACK WEDGE DETECTED IN PATH ID (URI: /fpc//pfe//cm//Host_Loopback//HOST_LOOPBACK_MAKE_CMERROR_ID[]) This issue affects Juniper Networks Junos OS:

  • All versions earlier than 20.4R3-S8;
  • 21.1 versions earlier than 21.1R3-S4;
  • 21.2 versions earlier than 21.2R3-S6;
  • 21.3 versions earlier than 21.3R3-S3;
  • 21.4 versions earlier than 21.4R3-S5;
  • 22.1 versions earlier than 22.1R2-S2, 22.1R3;
  • 22.2 versions earlier than 22.2R2-S1, 22.2R3.

Weakness

The product correctly neutralizes certain special elements, but it improperly neutralizes equivalent special elements.

Affected Software

Name Vendor Start Version End Version
Junos Juniper 20.4 (including) 20.4 (including)
Junos Juniper 20.4-r1 (including) 20.4-r1 (including)
Junos Juniper 20.4-r1-s1 (including) 20.4-r1-s1 (including)
Junos Juniper 20.4-r2 (including) 20.4-r2 (including)
Junos Juniper 20.4-r2-s1 (including) 20.4-r2-s1 (including)
Junos Juniper 20.4-r2-s2 (including) 20.4-r2-s2 (including)
Junos Juniper 20.4-r3 (including) 20.4-r3 (including)
Junos Juniper 20.4-r3-s1 (including) 20.4-r3-s1 (including)
Junos Juniper 20.4-r3-s2 (including) 20.4-r3-s2 (including)
Junos Juniper 20.4-r3-s3 (including) 20.4-r3-s3 (including)
Junos Juniper 20.4-r3-s4 (including) 20.4-r3-s4 (including)
Junos Juniper 20.4-r3-s5 (including) 20.4-r3-s5 (including)
Junos Juniper 20.4-r3-s6 (including) 20.4-r3-s6 (including)
Junos Juniper 20.4-r3-s7 (including) 20.4-r3-s7 (including)

Potential Mitigations

References