CVE-2023-25083 : Security Advisory and Response

This CVE-2023-25083 was published on July 6, 2023, and it involves multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. The vulnerability is caused by the use of an unsafe sprintf pattern, allowing an attacker to execute arbitrary code through a specially crafted HTTP request. This can be triggered by an attacker with high privileges by sending HTTP requests, particularly in the firewall_handler_set function with specific variables.

Understanding CVE-2023-25083

This section delves into the key aspects of CVE-2023-25083, including its description, impact, technical details, and mitigation strategies.

What is CVE-2023-25083?

CVE-2023-25083 is a vulnerability with a high severity score, impacting the Milesight UR32L v32.3.0.5 product. It involves buffer overflow vulnerabilities in the vtysh_ubus binary due to an unsafe sprintf pattern, enabling attackers to execute arbitrary code via specially crafted HTTP requests.

The Impact of CVE-2023-25083

The impact of this vulnerability is significant, with a CVSSv3.1 base severity score of 7.2 (High). It allows attackers to potentially gain control over affected systems, compromising confidentiality, integrity, and availability. The vulnerability poses a serious security risk to systems running the affected Milesight UR32L version.

Technical Details of CVE-2023-25083

This section provides in-depth technical insights into CVE-2023-25083, including the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability stems from multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. It occurs due to the use of an unsafe sprintf pattern, allowing an attacker to execute arbitrary code through specially crafted HTTP requests.

Affected Systems and Versions

The specific affected product and version include Milesight UR32L v32.3.0.5. Systems running this version are vulnerable to the exploitation of buffer overflow vulnerabilities in the vtysh_ubus binary.

Exploitation Mechanism

Attackers with high privileges can exploit the vulnerability by sending specially crafted HTTP requests to the firewall_handler_set function, manipulating the ip and mac variables. This manipulation can trigger the buffer overflow and potentially lead to arbitrary code execution.

Mitigation and Prevention

It is crucial for organizations to implement immediate and long-term mitigation strategies to address CVE-2023-25083 and enhance overall security posture.

Immediate Steps to Take

Immediate actions include disabling unnecessary services, implementing firewall rules, and applying access controls to limit potential attack surfaces. Organizations should also monitor network traffic for any suspicious activity that might indicate exploitation attempts.

Long-Term Security Practices

Long-term security practices should focus on secure coding practices, regular security assessments, and timely software updates. Employing intrusion detection systems and conducting security training for personnel can also enhance resilience against similar vulnerabilities.

Patching and Updates

Vendors often release security patches to address vulnerabilities like CVE-2023-25083. It is essential for organizations to apply these patches promptly, ensuring that systems are protected against known threats and vulnerabilities. Regularly updating software and firmware can help mitigate risks associated with security flaws.