CVE-2021-0219 : Exploit Details and Defense Strategies
Discover the details of CVE-2021-0219, a command injection vulnerability in Juniper Networks Junos OS, impacting multiple versions. Learn about the impact, affected systems, exploitation mechanism, mitigation steps, and necessary updates.
A command injection vulnerability was discovered in the install package validation subsystem of Juniper Networks Junos OS. This vulnerability may allow a locally authenticated attacker with privileges to execute commands with root privilege through a specific CLI command. This CVE affects various versions of Junos OS. Find out more details below.
Understanding CVE-2021-0219
This section provides a detailed overview of the CVE-2021-0219 vulnerability.
What is CVE-2021-0219?
CVE-2021-0219 is a command injection vulnerability found in the 'request system software add validate-on-host' CLI command of Juniper Networks Junos OS. This vulnerability allows a locally authenticated attacker to execute commands with root privilege.
The Impact of CVE-2021-0219
The impact of this vulnerability is rated as a Medium severity with a CVSS base score of 6.7. It has a low attack complexity and requires high privileges. The confidentiality and integrity impact are rated as high, with the availability impact also being high.
Technical Details of CVE-2021-0219
This section delves into the technical aspects of CVE-2021-0219.
Vulnerability Description
The vulnerability arises in the install package validation subsystem, allowing an attacker to execute commands as root.
Affected Systems and Versions
Juniper Networks Junos OS versions prior to 20.3R2 are affected by this vulnerability.
Exploitation Mechanism
To exploit this vulnerability, a locally authenticated attacker with privileges needs to execute a specific CLI command.
Mitigation and Prevention
Learn about the steps to mitigate and prevent the CVE-2021-0219 vulnerability.
Immediate Steps to Take
Limit CLI access to the device from trusted networks, restrict access to the CLI to authorized personnel, and limit the 'request system software add validate-on-host' command.
Long-Term Security Practices
Implement access controls, regularly update Junos OS, and follow security best practices to enhance system security.
Patching and Updates
Ensure systems are updated to the patched versions of Junos OS to eliminate the vulnerability.