title: Junos OS: MX Series: Denial of Service vulnerability in MS-PIC component on MS-MIC or MS-MPC
description: On MX Series, when the SIP ALG is enabled, receipt of a certain malformed SIP packet may crash the MS-PIC component on MS-MIC or MS-MPC. By continuously sending a crafted SIP packet, an attacker can repeatedly bring down MS-PIC on MS-MIC/MS-MPC causing a sustained Denial of Service. This issue affects Juniper Networks Junos OS on MX Series: 16.1 versions prior to 16.1R7-S5; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R3; 17.2 versions prior to 17.2R3-S3; 17.3 versions prior to 17.3R3-S6 ; 17.4 versions prior to 17.4R2-S8, 17.4R3; 18.1 versions prior to 18.1R3-S3; 18.2 versions prior to 18.2R3; 18.3 versions prior to 18.3R2; 18.4 versions prior to 18.4R2.
problem types: DoS
affected:
{
platforms: MX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 16.1R7-S5, status: affected, version: 16.1, versionType: custom
lessThan: 16.2R2-S11, status: affected, version: 16.2, versionType: custom
lessThan: 17.1R3, status: affected, version: 17.1, versionType: custom
lessThan: 17.2R3-S3, status: affected, version: 17.2, versionType: custom
lessThan: 17.3R3-S6 , status: affected, version: 17.3, versionType: custom
lessThan: 17.4R2-S8, 17.4R3, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R3-S3, status: affected, version: 18.1, versionType: custom
lessThan: 18.2R3, status: affected, version: 18.2, versionType: custom
lessThan: 18.3R2, status: affected, version: 18.3, versionType: custom
lessThan: 18.4R2, status: affected, version: 18.4, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 these specific issues: 16.1R7-S5, 16.2R2-S11, 17.1R3, 17.2R3-S3, 17.3R3-S6, 17.4R2-S8, 17.4R3, 18.1R3-S3, 18.2R3, 18.3R2, 18.4R2, 19.1R1, and all subsequent releases.
workarounds: Disable the use of the SIP application layer gateway (ALG) configuration if not needed.