CVE-2022-20739 : Exploit Details and Defense Strategies
Learn about CVE-2022-20739, a high-severity vulnerability in Cisco SD-WAN vManage Software allowing attackers to escalate privileges. Take immediate steps for mitigation.
A vulnerability in the CLI of Cisco SD-WAN vManage Software allows an authenticated, local attacker to execute arbitrary commands on the underlying operating system as the root user. This CVE was published on April 13, 2022.
Understanding CVE-2022-20739
This section provides detailed insights into the nature and impact of the vulnerability.
What is CVE-2022-20739?
The vulnerability in Cisco SD-WAN vManage Software enables a low-privileged user to escalate privileges on the affected system to the root user by executing arbitrary commands.
The Impact of CVE-2022-20739
The impact of this vulnerability is rated as high, with a CVSS base score of 7.3. It allows attackers to execute commands as the root user, potentially leading to complete control over the affected system.
Technical Details of CVE-2022-20739
This section delves into the technical aspects of the vulnerability.
Vulnerability Description
The vulnerability arises from a file executed by the root user when specific commands are run by a low-privileged user on the affected system. Attackers can inject commands to this file as a lower-privileged user, leading to privilege escalation upon execution by an admin user.
Affected Systems and Versions
The Cisco SD-WAN vManage Software is affected by this vulnerability across all versions.
Exploitation Mechanism
To exploit this vulnerability, an authenticated attacker with low-privileged access injects arbitrary commands, waiting for admin commands to trigger their execution as the root user.
Mitigation and Prevention
Protecting your systems from CVE-2022-20739 is crucial to maintaining security.
Immediate Steps to Take
Immediately restrict and monitor user access rights, especially low-privileged users. Cisco may release security patches or workarounds.
Long-Term Security Practices
Regularly update and patch all software to prevent exploitation of known vulnerabilities. Implement network segmentation and least privilege access controls.
Patching and Updates
Stay informed about security advisories and updates from Cisco. Apply patches promptly and follow best practices for secure system configuration.