title: Junos OS: MX Series: In a BBE scenario upon receipt of specific malformed packets from subscribers the process bbe-smgd will crash
description: An Improper Check for Unusual or Exceptional Conditions vulnerability in the bbe-smgd of Juniper Networks Junos OS allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In a Broadband Edge / Subscriber Management scenario on MX Series when a specifically malformed ICMP packet addressed to the device is received from a subscriber the bbe-smgd will crash, affecting the subscriber sessions that are connecting, updating, or terminating. Continued receipt of such packets will lead to a sustained DoS condition. When this issue happens the below log can be seen if the traceoptions for the processes smg-service are enabled: BBE_TRACE(TRACE_LEVEL_INFO, "%s: Dropped unsupported ICMP PKT ... This issue affects Juniper Networks Junos OS on MX Series: All versions prior to 19.4R3-S11; 20.2 versions prior to 20.2R3-S7; 20.3 versions prior to 20.3R3-S6; 20.4 versions prior to 20.4R3-S6; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S4; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S2; 22.1 versions prior to 22.1R2-S2, 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S2, 22.3R2.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 19.4R3-S11, status: affected, versionType: custom
version: 20.2, status: affected, lessThan: 20.2R3-S7, versionType: custom
version: 20.3, status: affected, lessThan: 20.3R3-S6, versionType: custom
version: 20.4, status: affected, lessThan: 20.4R3-S6, versionType: custom
version: 21.1, status: affected, lessThan: 21.1R3-S4, versionType: custom
version: 21.2, status: affected, lessThan: 21.2R3-S4, versionType: custom
version: 21.3, status: affected, lessThan: 21.3R3-S3, versionType: custom
version: 21.4, status: affected, lessThan: 21.4R3-S2, versionType: custom
version: 22.1, status: affected, lessThan: 22.1R2-S2, 22.1R3, versionType: custom
version: 22.2, status: affected, lessThan: 22.2R2, versionType: custom
version: 22.3, status: affected, lessThan: 22.3R1-S2, 22.3R2, versionType: custom
platforms: MX Series
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
attackVector: ADJACENT_NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 7.4
baseSeverity: HIGH
]
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: 19.4R3-S11, 20.2R3-S7, 20.3R3-S6, 20.4R3-S6, 21.1R3-S4, 21.2R3-S4, 21.3R3-S3, 21.4R3-S2, 22.1R2-S2, 22.1R3, 22.2R2, 22.3R1-S2, 22.3R2, 22.4R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.