An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).
When a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.
This issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.
This issue affects Juniper Junos OS:
All versions prior to 20.4R3-S5;
21.1 versions prior to 21.1R3-S4;
21.2 versions prior to 21.2R3-S3;
21.3 versions prior to 21.3R3-S5;
21.4 versions prior to 21.4R3-S2;
22.1 versions prior to 22.1R3;
22.2 versions prior to 22.2R3;
22.3 versions prior to 22.3R2.
Isolated PVLAN's can be configured with the following command:[set vlans <vlan-name> private-vlan isolated]
[set vlans <vlan-name> private-vlan isolated]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was found during internal product security testing or research.
This issue has been assigned CVE-2023-44203.
The following software releases have been updated to resolve this specific issue: Junos OS 20.4R3-S5, 21.1R3-S4, 21.2R3-S3, 21.3R3-S5, 21.4R3-S2, 22.1R3, 22.2R3, 22.3R2, 22.4R1, and all subsequent releases.
This issue is being tracked as PR 1667069 which is visible on the Customer Support website.
Note: Juniper SIRT's policy [juniper.net] is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
There are no known workarounds for this issue.
2023-10-11: Initial Publication