title: Junos OS: Buffer overflow vulnerability in device control daemon
description: A stack buffer overflow vulnerability in the device control daemon (DCD) on Juniper Networks Junos OS allows a low privilege local user to create a Denial of Service (DoS) against the daemon or execute arbitrary code in the system with root privilege. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S12, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.2X75 versions prior to 18.2X75-D53, 18.2X75-D65; 18.3 versions prior to 18.3R2-S4, 18.3R3-S4; 18.4 versions prior to 18.4R2-S5, 18.4R3-S5; 19.1 versions prior to 19.1R3-S3; 19.2 versions prior to 19.2R1-S5, 19.2R3; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R1-S1, 20.2R2. Versions of Junos OS prior to 17.3 are unaffected by this vulnerability.
problem types: CWE-121 Stack-based Buffer Overflow
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 17.3R3-S9, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R2-S12, 17.4R3-S3, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R3-S11, status: affected, version: 18.1, versionType: custom
lessThan: 18.2R3-S6, status: affected, version: 18.2, versionType: custom
lessThan: 18.2X75-D53, 18.2X75-D65, status: affected, version: 18.2X75, versionType: custom
lessThan: 18.3R2-S4, 18.3R3-S4, status: affected, version: 18.3, versionType: custom
lessThan: 18.4R2-S5, 18.4R3-S5, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R3-S3, status: affected, version: 19.1, versionType: custom
lessThan: 19.2R1-S5, 19.2R3, status: affected, version: 19.2, versionType: custom
lessThan: 19.3R2-S4, 19.3R3, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R1-S3, 19.4R2-S2, 19.4R3, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R1-S4, 20.1R2, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R1-S1, 20.2R2, status: affected, version: 20.2, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 7.8
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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-S9, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D53, 18.2X75-D65, 18.3R2-S4, 18.3R3-S4, 18.4R2-S5, 18.4R3-S5, 19.1R3-S3, 19.2R1-S5, 19.2R3, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2-S2, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1-S1, 20.2R2, 20.3R1, and all subsequent releases.
workarounds: Use access lists or firewall filters to limit CLI access to the device only from trusted, administrative networks or hosts.