Junos OS: MX Series: An FPC crash is observed when CFM is enabled in a VPLS scenario and a specific LDP related command is run

Summary

An Improper Release of Memory Before Removing Last Reference vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a local, low privileged attacker to cause an FPC crash, leading to Denial of Service (DoS). On all Junos MX Series with MPC1 - MPC9, LC480, LC2101, MX10003, and MX80, when Connectivity-Fault-Management (CFM) is enabled in a VPLS scenario, and a specific LDP related command is run, an FPC will crash and reboot. Continued execution of this specific LDP command can lead to sustained Denial of Service condition. This issue affects: Juniper Networks Junos OS on MX Series: • All versions prior to 20.4R3-S7; • 21.1 versions prior to 21.1R3-S5; • 21.2 versions prior to 21.2R3-S4; • 21.3 versions prior to 21.3R3-S4; • 21.4 versions prior to 21.4R3-S3; • 22.1 versions prior to 22.1R3-S1; • 22.2 versions prior to 22.2R2-S1, 22.2R3; • 22.3 versions prior to 22.3R1-S2, 22.3R2.

Timeline

1. Oct 12, 2023, 11:04 PM UTCCVE published
2. Sep 17, 2024, 3:53 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Sep 17, 2024, 4:10 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 20.4R3-S7; From 21.1 · fixed in 21.1R3-S5; From 21.2 · fixed in 21.2R3-S4; From 21.3 · fixed in 21.3R3-S4; From 21.4 · fixed in 21.4R3-S3; From 22.1 · fixed in 22.1R3-S1

References 1