title: Junos OS Evolved: PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202: The aftman-bt process will crash in a MoFRR scenario after multiple link flaps
description: A Use After Free vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS Evolved on PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202 allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS).
The process 'aftman-bt' will crash after multiple flaps on a multicast-only fast reroute (MoFRR) enabled interface. This will cause the respective FPC to stop forwarding traffic and it needs to be rebooted to restore the service.
An indication that the system experienced this issue is the following log message:
<date> <hostname> evo-aftmand-bt[<pid>]: [Error] jexpr_fdb: sanity check failed, ... , app_name L3 Mcast Routes
This issue affects Juniper Networks Junos OS Evolved on PTX10001-36MR, PTX10004, PTX10008, PTX10016 with LC1201/1202:
21.2 version 21.2R1-EVO and later versions;
21.3 version 21.3R1-EVO and later versions;
21.4 versions prior to 21.4R3-S3-EVO;
22.1 version 22.1R1-EVO and later versions;
22.2 versions prior to 22.2R3-S2-EVO;
22.3 versions prior to 22.3R3-EVO;
22.4 versions prior to 22.4R1-S2-EVO, 22.4R2-EVO.
problem types: CWE-416 Use After Free
affected:
{
defaultStatus: unaffected
platforms: [PTX10001-36MR, PTX10004, PTX10008, PTX10016]
product: Junos OS Evolved
vendor: Juniper Networks
versions:
changes: [at: 21.2R1-EVO, status: affected], lessThan: 21.2*, status: affected, version: 21.2, versionType: custom
changes: [at: 21.3R1-EVO, status: affected], lessThan: 21.3*, status: affected, version: 21.3, versionType: custom
lessThan: 21.4R3-S3-EVO, status: affected, version: 21.4, versionType: custom
changes: [at: 22.1R1-EVO, status: affected], lessThan: 22.1*, status: affected, version: 22.1, versionType: custom
lessThan: 22.2R3-S2-EVO, status: affected, version: 22.2, versionType: custom
lessThan: 22.3R3-EVO, status: affected, version: 22.3, versionType: custom
lessThan: 22.4R1-S2-EVO, 22.4R2-EVO, status: affected, version: 22.4, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
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 Evolved 21.4R3-S3-EVO, 22.2R3-S2-EVO*, 22.3R3-EVO, 22.4R1-S2-EVO, 22.4R2-EVO, 23.1R1-EVO, and all subsequent releases.
workarounds: There are no known workarounds for this issue.