CVE-2022-22202

Summary

An Improper Handling of Exceptional Conditions vulnerability on specific PTX Series devices, including the PTX1000, PTX3000 (NextGen), PTX5000, PTX10002-60C, PTX10008, and PTX10016 Series, in Juniper Networks Junos OS allows an unauthenticated MPLS-based attacker to cause a Denial of Service (DoS) by triggering the dcpfe process to crash and FPC to restart. On affected PTX Series devices, processing specific MPLS packets received on an interface with multiple units configured may cause FPC to restart unexpectedly. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects PTX Series devices utilizing specific FPCs found on PTX1000, PTX3000 (NextGen), PTX5000, PTX10002-60C, PTX10008, and PTX10016 Series devices, only if multiple units are configured on the ingress interface, and at least one unit has 'family mpls' not configured. See the configuration sample below for more information. No other platforms are affected by this vulnerability. This issue affects: Juniper Networks Junos OS on PTX Series: All versions prior to 19.1R3-S9; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R3-S8; 20.1 versions prior to 20.1R3-S4; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S4; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S2; 21.2 versions prior to 21.2R3-S1; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R2; 22.1 versions prior to 22.1R2.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OSunspecified < 19.1R3-S9affected
Juniper NetworksJunos OS19.2 < 19.2R3-S6affected
Juniper NetworksJunos OS19.3 < 19.3R3-S6affected
Juniper NetworksJunos OS19.4 < 19.4R3-S8affected
Juniper NetworksJunos OS20.1 < 20.1R3-S4affected
Juniper NetworksJunos OS20.2 < 20.2R3-S5affected
Juniper NetworksJunos OS20.3 < 20.3R3-S4affected
Juniper NetworksJunos OS20.4 < 20.4R3-S4affected
Juniper NetworksJunos OS21.1 < 21.1R3-S2affected
Juniper NetworksJunos OS21.2 < 21.2R3-S1affected
Juniper NetworksJunos OS21.3 < 21.3R3affected
Juniper NetworksJunos OS21.4 < 21.4R2affected
Juniper NetworksJunos OS22.1 < 22.1R2affected

Weaknesses

  • CWE-755: CWE-755 Improper Handling of Exceptional Conditions
  • Denial of Service (DoS)

Workarounds

The FPC crash only occurs if specific MPLS packets are received on an interface with multiple units configured and at least one unit has family mpls not configured. Also, the first unit with family mpls configured is not the lowest numerical unit on that interface.

A viable config-based workaround would be to reorder the unit numbers on core-facing interfaces to ensure the numerically lowest unit has 'family mpls' configured.

ADP Enrichment

CVE Program Container

Additional References

References