Permissions, Privileges, and Access Controls in Junos OS and Junos OS Evolved - CVE-2021-31359
Published: October 18, 2021
Vulnerability identifier: #VU57418
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-31359
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in the Juniper DHCP daemon (jdhcpd) process, which leads to security restrictions bypass and privilege escalation.
Affected software
Junos OS
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2021-31359
Install updates from vendor's website.
Junos OS - addressed in versions 15.1R7-S10, 17.4R3-S5, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R3-S6, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.1R3, 21.2R1
Junos OS Evolved - addressed in versions 20.4R2-S3-EVO, 21.2R1-EVO
Junos OS Evolved - addressed in versions 20.4R2-S3-EVO, 21.2R1-EVO