CVE-2021-0235 : What You Need to Know
Learn about CVE-2021-0235, a vulnerability in Junos OS affecting SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3, and vSRX Series devices. Find mitigation steps and impacted versions.
A vulnerability, known as CVE-2021-0235, affecting Junos OS on SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3, and vSRX Series devices has been identified. This vulnerability revolves around incorrect permission assignments to tenant system administrators, potentially leading to inadvertent network traffic sharing and misconfiguration in a multi-tenant environment.
Understanding CVE-2021-0235
This section delves into the details of the CVE-2021-0235 vulnerability.
What is CVE-2021-0235?
The vulnerability in Junos OS impacts devices using tenant services by assigning improper permission schemes to tenant system administrators. This misconfiguration can result in unintended sharing of network traffic between tenants and mismanagement of system traffic, affecting all tenants and the service provider.
The Impact of CVE-2021-0235
The vulnerability can allow a tenant host administrator to configure logical firewall isolation, potentially affecting other tenant networks within the same environment.
Technical Details of CVE-2021-0235
This section covers the technical aspects of the CVE-2021-0235 vulnerability.
Vulnerability Description
Due to incorrect permission schemes, tenant system administrators may inadvertently send their network traffic to other tenants while modifying overall device system traffic management.
Affected Systems and Versions
Junos OS versions ranging from 18.3 to 20.4 on SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3, and vSRX Series are affected by this vulnerability.
Exploitation Mechanism
Currently, Juniper SIRT is unaware of any malicious exploitation of this vulnerability.
Mitigation and Prevention
Discover the steps to mitigate and prevent the CVE-2021-0235 vulnerability.
Immediate Steps to Take
Update Junos OS to the resolved versions, including 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S2, 20.1R2, 20.1R3, 20.2R2-S1, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, or subsequent releases.
Long-Term Security Practices
Ensure proper permissions and access control configurations are in place to prevent unauthorized network sharing in a multi-tenant environment.
Patching and Updates
Regularly check for security updates and patches from Juniper Networks to address vulnerabilities and enhance system security.