SB2024071603 - Denial of service in Junos OS Evolved PFE

Security Bulletin ID SB2024071603

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Adjecent network

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Improper check for unusual or exceptional conditions (CVE-ID: CVE-2024-39519)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper check for unusual or exceptional conditions error in the Packet Forwarding Engine (PFE). A remote non-authenticated attacker can cause a Denial-of-Service (DoS).

On all ACX 7000 Series platforms running Junos OS Evolved, and configured with IRBs, if a Customer Edge device (CE) device is dual homed to two Provider Edge devices (PE) a traffic loop will occur when the CE sends multicast packets.

This issue can be triggered by IPv4 and IPv6 traffic.

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2024-07-Security-Bulletin-Junos-OS-Evolved-ACX-7000-Series-Multicast-traffic-is-looped-in-a-multihoming-EVPN-MPLS-scenario-CVE-2024-39519