CVE-2021-0247

Summary

A Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization) vulnerability in the firewall process (dfwd) of Juniper Networks Junos OS allows an attacker to bypass the firewall rule sets applied to the input loopback filter on any interfaces of a device. This issue is detectable by reviewing the PFE firewall rules, as well as the firewall counters and seeing if they are incrementing or not. For example: show firewall Filter: default_bpdu_filter Filter: FILTER-INET-01 Counters: Name Bytes Packets output-match-inet 0 0 <<<<<< missing firewall packet count This issue affects: Juniper Networks Junos OS 14.1X53 versions prior to 14.1X53-D53 on QFX Series; 14.1 versions 14.1R1 and later versions prior to 15.1 versions prior to 15.1R7-S6 on QFX Series, PTX Series; 15.1X53 versions prior to 15.1X53-D593 on QFX Series; 16.1 versions prior to 16.1R7-S7 on QFX Series, PTX Series; 16.2 versions prior to 16.2R2-S11, 16.2R3 on QFX Series, PTX Series; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2 on QFX Series, PTX Series; 17.2 versions prior to 17.2R1-S9, 17.2R3-S3 on QFX Series, PTX Series; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on QFX Series, PTX Series; 17.4 versions prior to 17.4R2-S9, 17.4R3 on QFX Series, PTX Series; 18.1 versions prior to 18.1R3-S9 on QFX Series, PTX Series; 18.2 versions prior to 18.2R2-S6, 18.2R3-S3 on QFX Series, PTX Series; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1 on QFX Series, PTX Series; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R2-S7, 18.4R3 on QFX Series, PTX Series; 19.1 versions prior to 19.1R1-S4, 19.1R2-S1, 19.1R3 on QFX Series, PTX Series; 19.2 versions prior to 19.2R1-S3, 19.2R2 on QFX Series, PTX Series.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS14.1X53 < 14.1X53-D53affected
Juniper NetworksJunos OS15.1X53 < 15.1X53-D593affected
Juniper NetworksJunos OS14.1R1 < 14.1*affected
Juniper NetworksJunos OS15.1 < 15.1R7-S6affected
Juniper NetworksJunos OS16.1 < 16.1R7-S7affected
Juniper NetworksJunos OS16.2 < 16.2R2-S11, 16.2R3affected
Juniper NetworksJunos OS17.1 < 17.1R2-S11, 17.1R3-S2affected
Juniper NetworksJunos OS17.2 < 17.2R1-S9, 17.2R3-S3affected
Juniper NetworksJunos OS17.3 < 17.3R2-S5, 17.3R3-S7affected
Juniper NetworksJunos OS17.4 < 17.4R2-S9, 17.4R3affected
Juniper NetworksJunos OS18.1 < 18.1R3-S9affected
Juniper NetworksJunos OS18.2 < 18.2R2-S6, 18.2R3-S3affected
Juniper NetworksJunos OS18.3 < 18.3R1-S7, 18.3R2-S3, 18.3R3-S1affected
Juniper NetworksJunos OS18.4 < 18.4R1-S5, 18.4R2-S3, 18.4R3affected
Juniper NetworksJunos OS19.1 < 19.1R1-S4, 19.1R2-S1, 19.1R3affected
Juniper NetworksJunos OS19.2 < 19.2R1-S3, 19.2R2affected

Weaknesses

  • CWE-362: CWE-362 Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)

Workarounds

There are no viable workarounds for this issue.

ADP Enrichment

CVE Program Container

Additional References

References