title: Junos OS: QFX10K Series: Denial of Service (DoS) upon receipt of DVMRP packets received on multi-homing ESI in VXLAN.
description: A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) of Juniper Networks Junos OS on the QFX10K Series switches allows an attacker to trigger a packet forwarding loop, leading to a partial Denial of Service (DoS). The issue is caused by DVMRP packets looping on a multi-homed Ethernet Segment Identifier (ESI) when VXLAN is configured. DVMRP packets received on a multi-homed ESI are sent to the peer, and then incorrectly forwarded out the same ESI, violating the split horizon rule. This issue only affects QFX10K Series switches, including the QFX10002, QFX10008, and QFX10016. Other products and platforms are unaffected by this vulnerability. This issue affects Juniper Networks Junos OS on QFX10K Series: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 version 18.2R1 and later versions; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S8; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R1-S7, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2.
problem types: CWE-697 Incorrect Comparison
affected:
{
platforms: QFX10K Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 17.3R3-S12, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R3-S5, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R3-S13, status: affected, version: 18.1, versionType: custom
lessThan: 18.2*, status: affected, version: 18.2R1, versionType: custom
lessThan: 18.3R3-S5, status: affected, version: 18.3, versionType: custom
lessThan: 18.4R2-S9, 18.4R3-S8, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R3-S5, status: affected, version: 19.1, versionType: custom
lessThan: 19.2R1-S7, 19.2R3-S2, status: affected, version: 19.2, versionType: custom
lessThan: 19.3R3-S2, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R3-S3, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R2-S2, 20.1R3, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R3, status: affected, version: 20.2, versionType: custom
lessThan: 20.3R3, status: affected, version: 20.3, versionType: custom
lessThan: 20.4R2, status: affected, version: 20.4, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: LOW
baseScore: 6.1
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
version: 3.1
]
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: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R2-S9, 18.4R3-S8, 19.1R3-S5, 19.2R1-S7, 19.2R3-S2, 19.3R3-S2, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3, 20.3R3, 20.4R2, 21.1R1, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.
Service may be temporarily restored by disabling/enabled the IRB affected by this issue.  Note that this will cause a temporary service interruption as the interface is flapped.