CVE-2023-25086 Explained : Impact and Mitigation

This CVE identifies multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. These vulnerabilities can be exploited through a specially crafted HTTP request, potentially leading to arbitrary code execution. The vulnerability was discovered by Francesco Benvenuto of Cisco Talos and was assigned a high severity base score of 7.2.

Understanding CVE-2023-25086

This section provides detailed insights into the nature of the CVE-2023-25086 vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2023-25086?

The CVE-2023-25086 vulnerability encompasses multiple buffer overflow vulnerabilities present in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. Exploitation of these vulnerabilities can result in arbitrary code execution, posing a significant security risk.

The Impact of CVE-2023-25086

The impact of CVE-2023-25086 is characterized by the potential for unauthorized parties to execute arbitrary code on affected systems. This can lead to severe consequences such as data theft, system compromise, and disruption of services, highlighting the critical nature of this vulnerability.

Technical Details of CVE-2023-25086

Understanding the technical aspects of CVE-2023-25086 is crucial for effective mitigation and prevention strategies.

Vulnerability Description

The vulnerability stems from multiple buffer overflow flaws in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. The insecure sprintf pattern is leveraged, allowing attackers to trigger arbitrary code execution through specially crafted HTTP requests.

Affected Systems and Versions

The affected system in this case is Milesight UR32L v32.3.0.5. Organizations utilizing this specific version are vulnerable to exploitation unless proper protective measures are implemented.

Exploitation Mechanism

By sending malicious HTTP requests to the firewall_handler_set function with specific variables, attackers can trigger buffer overflows and potentially execute arbitrary code, exploiting the vulnerability.

Mitigation and Prevention

Addressing CVE-2023-25086 promptly and effectively requires a comprehensive approach that includes immediate action and long-term security practices.

Immediate Steps to Take

Organizations should promptly apply security patches released by Milesight to address the buffer overflow vulnerabilities in vtysh_ubus.
Implement network-level controls to restrict access to vulnerable components and mitigate the risk of exploitation.
Monitor network traffic for suspicious HTTP requests that could indicate attempted exploitation of the vulnerability.

Long-Term Security Practices

Regularly update and patch software components to mitigate the risk of known vulnerabilities being exploited.
Conduct security assessments and penetration testing to identify and address potential weaknesses before they are exploited.
Foster a culture of cybersecurity awareness within the organization to promote proactive security measures and incident response readiness.

Patching and Updates

Stay informed about security advisories and updates provided by Milesight to address CVE-2023-25086. Timely application of patches is crucial to reducing the exposure to potential threats and ensuring the security of the organization's IT infrastructure.