title: Junos OS: Receipt of specially crafted UDP packets over MPLS may bypass stateless IP firewall rules
description: Receipt of specially crafted UDP/IP packets over MPLS may be able to bypass a stateless firewall filter. The crafted UDP packets must be encapsulated and meet a very specific packet format to be classified in a way that bypasses IP firewall filter rules. The packets themselves do not cause a service interruption (e.g. RPD crash), but receipt of a high rate of UDP packets may be able to contribute to a denial of service attack. This issue only affects processing of transit UDP/IP packets over MPLS, received on an interface with MPLS enabled. TCP packet processing and non-MPLS encapsulated UDP packet processing are unaffected by this issue. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D76; 12.3 versions prior to 12.3R12-S10; 12.3X48 versions prior to 12.3X48-D66, 12.3X48-D70; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D131, 15.1X49-D140; 15.1X53 versions prior to 15.1X53-D59 on EX2300/EX3400; 15.1X53 versions prior to 15.1X53-D67 on QFX10K; 15.1X53 versions prior to 15.1X53-D233 on QFX5200/QFX5110; 15.1X53 versions prior to 15.1X53-D471, 15.1X53-D490 on NFX; 16.1 versions prior to 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7; 16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3; 17.1 versions prior to 17.1R1-S7, 17.1R2-S7, 17.1R3; 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3; 17.2X75 versions prior to 17.2X75-D100; 17.3 versions prior to 17.3R1-S4, 17.3R2-S2, 17.3R3; 17.4 versions prior to 17.4R1-S3, 17.4R2; 18.1 versions prior to 18.1R2; 18.2X75 versions prior to 18.2X75-D5.
problem types: Firewall bypass
affected:
{
platforms: SRX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 12.1X46-D76, status: affected, version: 12.1X46, versionType: custom
lessThan: 12.3X48-D66, 12.3X48-D70, status: affected, version: 12.3X48, versionType: custom
lessThan: 15.1X49-D131, 15.1X49-D140, status: affected, version: 15.1X49, versionType: custom
}
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 12.3R12-S10, status: affected, version: 12.3, versionType: custom
lessThan: 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7, status: affected, version: 15.1, versionType: custom
lessThan: 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7, status: affected, version: 16.1, versionType: custom
lessThan: 16.2R1-S6, 16.2R2-S5, 16.2R3, status: affected, version: 16.2, versionType: custom
lessThan: 17.1R1-S7, 17.1R2-S7, 17.1R3, status: affected, version: 17.1, versionType: custom
lessThan: 17.2R1-S6, 17.2R2-S4, 17.2R3, status: affected, version: 17.2, versionType: custom
lessThan: 17.2X75-D100, status: affected, version: 17.2X75, versionType: custom
lessThan: 17.3R1-S4, 17.3R2-S2, 17.3R3, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R1-S3, 17.4R2, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R2, status: affected, version: 18.1, versionType: custom
lessThan: 18.2X75-D5, status: affected, version: 18.2X75, versionType: custom
}
{
platforms: EX2200/VC, EX3200, EX3300/VC, EX4200, EX4300, EX4550/VC, EX4600, EX6200, EX8200/VC (XRE), QFX3500, QFX3600, QFX5100
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 14.1X53-D47, status: affected, version: 14.1X53, versionType: custom
}
{
platforms: EX2300, EX3400
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D59, status: affected, version: 15.1X53, versionType: custom
}
{
platforms: QFX10000 Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D67, status: affected, version: 15.1X53, versionType: custom
}
{
platforms: QFX5110, QFX5200
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D233, status: affected, version: 15.1X53, versionType: custom
}
{
platforms: NFX150, NFX250
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D471, 15.1X53-D490, status: affected, version: 15.1X53, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
version: 3.0
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue: 12.1X46-D76, 12.3X48-D66, 12.3X48-D70, 14.1X53-D47, 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D131, 15.1X49-D140, 15.1X53-D233, 15.1X53-D471, 15.1X53-D490, 15.1X53-D59, 15.1X53-D67, 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R1-S7, 17.1R2-S7, 17.1R3, 17.2R1-S6, 17.2R2-S4, 17.2R3, 17.2X75-D100, 17.3R1-S4, 17.3R2-S2, 17.3R3, 17.4R1-S3, 17.4R2, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.