CVE-2023-25123 : Security Advisory and Response

This CVE-2023-25123 content provides insights into a critical security vulnerability identified in the Milesight UR32L v32.3.0.5 device.

Understanding CVE-2023-25123

CVE-2023-25123 describes multiple buffer overflow vulnerabilities present in the vtysh_ubus binary of the Milesight UR32L v32.3.0.5 device. These vulnerabilities stem from an unsafe sprintf pattern, allowing for the execution of arbitrary code through a specially crafted HTTP request. The vulnerability arises in the set_openvpn_client function when specific conditions are met.

What is CVE-2023-25123?

The vulnerability in CVE-2023-25123 pertains to stack-based buffer overflows, categorized under CWE-121. It allows attackers to execute malicious code by exploiting the buffer overflow in the Milesight UR32L device.

The Impact of CVE-2023-25123

With a CVSS v3.1 base score of 7.2 and a Base Severity of "High," CVE-2023-25123 poses a significant risk. The vulnerability's impact is classified as high for confidentiality, integrity, and availability, making it crucial to address promptly.

Technical Details of CVE-2023-25123

The following section delves into the specifics of the vulnerability, including the affected systems, exploitation mechanism, and potential risks.

Vulnerability Description

The buffer overflow vulnerabilities in the vtysh_ubus binary of the Milesight UR32L v32.3.0.5 device stem from insecure sprintf patterns, enabling attackers to trigger arbitrary code execution. Specifically, the set_openvpn_client function is prone to exploitation when certain parameters are manipulated.

Affected Systems and Versions

The impacted system in this CVE is the Milesight UR32L device running version v32.3.0.5. Users with this specific device version are at risk of exploitation through crafted HTTP requests.

Exploitation Mechanism

Attackers with elevated privileges can initiate malicious HTTP requests to trigger the buffer overflow vulnerabilities in the set_openvpn_client function. This action enables them to execute arbitrary code on the affected device, posing severe security implications.

Mitigation and Prevention

To safeguard systems against CVE-2023-25123, it is imperative to take immediate action and implement long-term security measures.

Immediate Steps to Take

Users should apply security patches and updates provided by Milesight promptly.
Employ network segmentation to limit the impact of potential attacks.
Monitor network traffic for suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Regularly update firmware and software on vulnerable devices.
Conduct routine security assessments and penetration testing to identify and mitigate vulnerabilities proactively.
Educate users on best practices for handling sensitive information and interacting with unknown networks.

Patching and Updates

Milesight users should proactively seek and apply patches released by the vendor to address the buffer overflow vulnerabilities in the UR32L v32.3.0.5 device. Keeping systems up to date with the latest security measures is crucial in preventing potential exploitation.