CVE-2023-25109 : Exploit Details and Defense Strategies

This CVE record discusses multiple buffer overflow vulnerabilities found in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, potentially leading to arbitrary code execution. An attacker with high privileges can exploit these vulnerabilities by sending specially crafted HTTP requests. The impact of this CVE is significant, with a high base severity score of 7.2.

Understanding CVE-2023-25109

This section delves into the details of CVE-2023-25109, outlining the vulnerability, its impact, technical specifics, and mitigation strategies.

What is CVE-2023-25109?

CVE-2023-25109 refers to multiple buffer overflow vulnerabilities present in the vtysh_ubus binary of the Milesight UR32L v32.3.0.5. These vulnerabilities arise due to an unsafe sprintf pattern, which can be exploited by an attacker through specially crafted HTTP requests to achieve arbitrary code execution.

The Impact of CVE-2023-25109

The impact of CVE-2023-25109 is significant, with a high base severity score of 7.2 in the CVSS v3.1 metrics. These vulnerabilities can be leveraged by attackers with high privileges to execute arbitrary code, posing a serious threat to the integrity, confidentiality, and availability of affected systems.

Technical Details of CVE-2023-25109

In this section, the technical aspects of CVE-2023-25109, including the vulnerability description, affected systems, and exploitation mechanism, are discussed in detail.

Vulnerability Description

The vulnerability in CVE-2023-25109 is categorized as a stack-based buffer overflow (CWE-121), primarily occurring in the set_gre function with the local_ip variable within the vtysh_ubus binary of Milesight UR32L v32.3.0.5.

Affected Systems and Versions

The specific affected system identified in this CVE is the UR32L model by Milesight running version v32.3.0.5.

Exploitation Mechanism

Attackers can exploit CVE-2023-25109 by sending specially crafted HTTP requests targeting the vulnerable vtysh_ubus binary of the affected Milesight UR32L v32.3.0.5 system. This exploitation can lead to arbitrary code execution, posing a severe risk to the security of the system.

Mitigation and Prevention

In addressing CVE-2023-25109, prompt actions are necessary to mitigate the risks associated with these buffer overflow vulnerabilities. Implementing immediate steps and adopting long-term security practices can enhance the overall security posture of the affected systems.

Immediate Steps to Take

Disable or restrict access to the vulnerable vtysh_ubus binary.
Monitor and filter incoming HTTP requests to detect potentially malicious traffic.
Apply security updates or patches provided by the vendor to address the vulnerabilities.

Long-Term Security Practices

Regularly update and patch software and firmware to mitigate potential security vulnerabilities.
Implement secure coding practices to prevent buffer overflow vulnerabilities in software development.
Conduct regular security assessments and penetration testing to identify and remediate security weaknesses.

Patching and Updates

Milesight users should ensure they apply patches or updates released by the vendor to address the buffer overflow vulnerabilities in the vtysh_ubus binary of UR32L v32.3.0.5. Regularly checking for security advisories and staying informed about security best practices is crucial in maintaining a secure environment.