OS Command Injection in Junos OS - CVE-2021-0219
Published: January 14, 2021
Vulnerability identifier: #VU49546
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-0219
CWE-ID: CWE-78
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation in install package validation subsystem. A local user can abuse the request system software add validate-on-host CLI command and execute arbitrary OS commands with root privileges.
Affected software
Junos OS
How to mitigate CVE-2021-0219
Install updates from vendor's website.
Junos OS - addressed in versions 17.3R3-S10, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2X75-D34, 18.2R2-S8, 18.2R3-S6, 18.3R3-S4, 18.4R1-S8, 18.4R2-S7, 18.4R3-S6, 19.1R1-S6, 19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R2-S2, 19.4R3-S1, 20.1R2, 20.2R1-S2, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1