CVE-2023-25117 : Vulnerability Insights and Analysis

This CVE-2023-25117 article provides an in-depth understanding of a critical vulnerability affecting Milesight UR32L v32.3.0.5, leading to multiple buffer overflow vulnerabilities.

Understanding CVE-2023-25117

CVE-2023-25117 involves buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, which can result in arbitrary code execution through specially crafted HTTP requests. The vulnerability arises due to the utilization of an unsafe sprintf pattern, making it possible for an attacker with high privileges to exploit the system.

What is CVE-2023-25117?

The vulnerability in CVE-2023-25117 is categorized as CWE-121: Stack-based Buffer Overflow, posing a significant security risk to affected systems. This vulnerability allows attackers to potentially execute malicious code by sending manipulated HTTP requests, compromising system integrity and confidentiality.

The Impact of CVE-2023-25117

The impact of CVE-2023-25117 is marked as high severity, with a CVSS v3.1 base score of 7.2. The vulnerability can be exploited remotely with low attack complexity and high privileges required, leading to significant confidentiality, integrity, and availability impacts on affected systems.

Technical Details of CVE-2023-25117

The technical details of CVE-2023-25117 shed light on the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from multiple buffer overflow flaws in the set_openvpn_client function within the vtysh_ubus binary of Milesight UR32L v32.3.0.5 due to improper handling of user input. Attackers can abuse this vulnerability by sending crafted HTTP requests, triggering the buffer overflow and potentially executing arbitrary code on the target system.

Affected Systems and Versions

The impact of CVE-2023-25117 is specifically observed in Milesight UR32L devices using version v32.3.0.5. Organizations utilizing this particular product version are at risk of exploitation if the necessary security measures are not implemented promptly.

Exploitation Mechanism

The exploitation of CVE-2023-25117 involves sending specially crafted HTTP requests to the vulnerable vtysh_ubus binary, exploiting the buffer overflow vulnerabilities within the set_openvpn_client function. By manipulating input parameters such as local_virtual_ip and local_virtual_mask, attackers can gain unauthorized access and execute arbitrary code on the target system.

Mitigation and Prevention

To address the risks associated with CVE-2023-25117, organizations and users are advised to take immediate steps, adopt long-term security practices, and apply relevant patches and updates.

Immediate Steps to Take

Disable unnecessary services and restrict network access to mitigate potential attack vectors.
Monitor network activity for any suspicious HTTP requests targeting the vulnerable binary.
Implement network segmentation and access controls to minimize the impact of successful exploitation.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify and remediate vulnerabilities proactively.
Educate personnel on secure coding practices and the importance of input validation to prevent buffer overflow vulnerabilities.
Stay informed about security advisories and updates from the vendor to address known vulnerabilities promptly.

Patching and Updates

Milesight UR32L users should apply the latest security patches released by the vendor to address the buffer overflow vulnerabilities and enhance the overall security posture of their systems.

By following these mitigation strategies and best practices, organizations can strengthen their defenses against CVE-2023-25117 and similar security threats.