CVE-2021-31382

Vulnerability Summary

On PTX1000 System, PTX10002-60C System, after upgrading to an affected release, a Race Condition vulnerability between the chassis daemon (chassisd) and firewall process (dfwd) of Juniper Networks Junos OS, may update the device's interfaces with incorrect firewall filters. This issue only occurs when upgrading the device to an affected version of Junos OS. Interfaces intended to have protections may have no protections assigned to them. Interfaces with one type of protection pattern may have alternate protections assigned to them. Interfaces intended to have no protections may have protections assigned to them. These firewall rule misassignments may allow genuine traffic intended to be stopped at the interface to propagate further, potentially causing disruptions in services by propagating unwanted traffic. An attacker may be able to take advantage of these misassignments. This issue affects Juniper Networks Junos OS on PTX1000 System: 17.2 versions 17.2R1 and later versions before 17.3 versions before 17.3R3-S12; 17.4 versions before 17.4R3-S5; 18.1 versions before 18.1R3-S13; 18.2 versions before 18.2R3-S8; 18.3 versions before 18.3R3-S5; 18.4 versions before 18.4R1-S8, 18.4R2-S8, 18.4R3-S8; 19.1 versions before 19.1R3-S5; 19.2 versions before 19.2R3-S2; 19.3 versions before 19.3R2-S6, 19.3R3-S3; 19.4 versions before 19.4R2-S4, 19.4R3-S3; 20.1 versions before 20.1R3; 20.2 versions before 20.2R2-S3, 20.2R3; 20.3 versions before 20.3R2-S1, 20.3R3; 20.4 versions before 20.4R1-S1, 20.4R2. This issue does not affect Juniper Networks Junos OS prior to version 17.2R1 on PTX1000 System. This issue affects Juniper Networks Junos OS on PTX10002-60C System: 18.2 versions 18.2R1 and later versions before 18.4 versions before 18.4R3-S9; 19.1 versions later than 19.1R1 before 19.4 versions before 19.4R2-S5, 19.4R3-S5; 20.1 versions before 20.1R3-S1; 20.2 versions before 20.2R3-S2; 20.3 versions before 20.3R3-S1; 20.4 versions 20.4R1 and later versions before 21.1 versions before 21.1R2; 21.2 versions 21.2R1 and later versions before 21.3 versions before 21.3R2. This issue does not affect Juniper Networks Junos OS prior to version 18.2R1 on PTX10002-60C System. This issue impacts all filter families (inet, inet6, etc.) and all loopback filters. It does not rely upon the location where a filter is set, impacting both logical and physical interfaces.

Vulnerability Trend

References