title: Junos OS: mosquitto Local Privilege Escalation vulnerability in SUID binaries
description: A sensitive information disclosure vulnerability in the mosquitto message broker of Juniper Networks Junos OS may allow a locally authenticated user with shell access the ability to read portions of sensitive files, such as the master.passwd file. Since mosquitto is shipped with setuid permissions enabled and is owned by the root user, this vulnerability may allow a local privileged user the ability to run mosquitto with root privileges and access sensitive information stored on the local filesystem. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12, 17.4 versions prior to 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.3 versions prior to 18.3R3-S4; 19.1 versions prior to 19.1R3-S4; 19.3 versions prior to 19.3R3-S1, 19.3R3-S2; 19.4 versions prior to 19.4R2-S3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3, 20.2R2, 20.2R3.
problem types: CWE-250 Execution with Unnecessary Privileges
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 17.3R3-S12, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R3-S4, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R3-S12, status: affected, version: 18.1, versionType: custom
lessThan: 18.3R3-S4, status: affected, version: 18.3, versionType: custom
lessThan: 19.1R3-S4, status: affected, version: 19.1, versionType: custom
lessThan: 19.3R3-S1, 19.3R3-S2, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R2-S3, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R2, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R1-S3, 20.2R2, 20.2R3, status: affected, version: 20.2, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: NONE
baseScore: 5.5
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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-S4, 18.1R3-S12, 19.1R3-S4, 19.3R3-S1, 19.3R3-S2, 19.4R2-S3, 20.1R2, 20.2R1-S3, 20.2R2, 20.2R3, 20.3R1, and all subsequent releases.
workarounds: Use access lists or firewall filters to limit access to the device only from trusted hosts. Limit shell access to only trusted system administrators.