CVE-2019-17421 Explained : Impact and Mitigation

Zoho ManageEngine OpManager 12.4.072 and Firewall Analyzer 12.4.072 contain a vulnerability (CVE-2019-17421) that allows local users to escalate privileges to root through incorrect file permissions on the packaged Nipper executable file.

Understanding CVE-2019-17421

This CVE identifies a local privilege escalation vulnerability in Zoho ManageEngine OpManager and Firewall Analyzer due to incorrect file permissions.

What is CVE-2019-17421?

The vulnerability in Zoho ManageEngine OpManager and Firewall Analyzer allows local users to gain root privileges by replacing the Nipper executable file with a malicious payload.

The Impact of CVE-2019-17421

The vulnerability poses a significant risk as it enables unauthorized users to elevate their privileges on the affected systems, potentially leading to unauthorized access and control.

Technical Details of CVE-2019-17421

The technical aspects of the vulnerability are as follows:

Vulnerability Description

The vulnerability arises from incorrect file permissions on the Nipper executable file.
Local users can exploit this flaw to gain root privileges by replacing the file with a malicious payload.

Affected Systems and Versions

Zoho ManageEngine OpManager 12.4.072
Zoho ManageEngine Firewall Analyzer 12.4.072

Exploitation Mechanism

Local users can exploit the vulnerability by manipulating the Nipper executable file with a malicious payload, leveraging the incorrect file permissions.

Mitigation and Prevention

To address CVE-2019-17421, consider the following steps:

Immediate Steps to Take

Restrict access to the vulnerable file to authorized users only.
Monitor file integrity and permissions regularly to detect unauthorized changes.
Implement the principle of least privilege to limit user capabilities.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments.
Educate users on secure file handling practices and the risks of unauthorized file modifications.

Patching and Updates

Apply security patches provided by Zoho ManageEngine for OpManager and Firewall Analyzer to fix the vulnerability and prevent exploitation.