title: Junos OS: ethtraceroute Local Privilege Escalation vulnerability in SUID binaries
description: A local privilege escalation vulnerability in ethtraceroute of Juniper Networks Junos OS may allow a locally authenticated user with shell access to escalate privileges and write to the local filesystem as root. ethtraceroute is shipped with setuid permissions enabled and is owned by the root user, allowing local users to run ethtraceroute with root privileges. This issue affects Juniper Networks Junos OS: 15.1X49 versions prior to 15.1X49-D240; 17.3 versions prior to 17.3R3-S11, 17.4 versions prior to 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1.
problem types: CWE-250 Execution with Unnecessary Privileges
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X49-D240, status: affected, version: 15.1X49, versionType: custom
lessThan: 17.3R3-S11, 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: 18.2R3-S7, status: affected, version: 18.2, versionType: custom
lessThan: 18.3R3-S4, status: affected, version: 18.3, versionType: custom
lessThan: 18.4R2-S7, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, status: affected, version: 19.1, versionType: custom
lessThan: 19.3R3-S2, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R3-S1, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R2, 20.1R3, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R2-S1, 20.2R3, status: affected, version: 20.2, versionType: custom
lessThan: 20.3R1-S1, status: affected, version: 20.3, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: NONE
baseScore: 5.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 15.1X49-D240, 17.3R3-S11, 17.4R3-S4, 18.1R3-S12, 18.2R3-S7, 18.4R2-S7, 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, 19.3R3-S2, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2-S1, 20.2R3, 20.3R1-S1, 21.1R1, and all subsequent releases.
As a proactive measure to tighten the security of other Ethernet OAM utilities, setuid was also removed from other binaries, including ethping, ethdm, ethslm and ethlm.
workarounds: To reduce the risk of malicious exploitation, use access lists or firewall filters to limit CLI access to the device only from trusted, administrative networks or hosts.  Additionally, limit access to the Junos OS shell to only trusted system administrators.