Juniper Junos OS on PTX Packet Forwarding Engine equivalent special elements

Summaryinfo

A vulnerability, which was classified as critical, was found in Juniper Junos OS on PTX. This issue affects some unknown processing of the component Packet Forwarding Engine. The manipulation results in improper neutralization of equivalent special elements. This vulnerability was named CVE-2024-21600. The attack needs to be approached within the local network. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Juniper Junos OS on PTX (Router Operating System) (affected version not known). Affected is some unknown functionality of the component Packet Forwarding Engine. The manipulation with an unknown input leads to a improper neutralization of equivalent special elements vulnerability. CWE is classifying the issue as CWE-76. The product correctly neutralizes certain special elements, but it improperly neutralizes equivalent special elements. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was presented 01/12/2024 as JSA75741. The advisory is available at supportportal.juniper.net. This vulnerability is traded as CVE-2024-21600 since 12/27/2023. The technical details are unknown and an exploit is not available.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

License

• commercial

Website

• Vendor: https://www.juniper.net/

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