CVE-2023-25093 : Security Advisory and Response

This CVE-2023-25093 report pertains to multiple buffer overflow vulnerabilities found in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, leading to potential arbitrary code execution through specially crafted HTTP requests.

Understanding CVE-2023-25093

This section delves into the details of the CVE-2023-25093 vulnerability, its impact, technical aspects, and mitigation strategies.

What is CVE-2023-25093?

The CVE-2023-25093 vulnerability involves unsafe sprintf pattern usage in the set_qos function of Milesight UR32L v32.3.0.5. An attacker with elevated privileges can exploit this vulnerability by sending malicious HTTP requests, potentially resulting in arbitrary code execution.

The Impact of CVE-2023-25093

The impact of CVE-2023-25093 is classified as high severity, with a CVSS v3.1 base score of 7.2. The confidentiality, integrity, and availability of affected systems are all at risk due to the buffer overflow vulnerabilities present in the vtysh_ubus binary.

Technical Details of CVE-2023-25093

Let's dive into the technical specifics related to CVE-2023-25093 to better understand the nature of the vulnerability.

Vulnerability Description

The vulnerability arises from multiple buffer overflow weaknesses in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. This is caused by the utilization of an unsafe sprintf pattern, allowing attackers to execute arbitrary code through crafted HTTP requests.

Affected Systems and Versions

The specific version impacted by CVE-2023-25093 is Milesight UR32L v32.3.0.5. Users operating this version are susceptible to the buffer overflow vulnerabilities present in the vtysh_ubus component.

Exploitation Mechanism

By sending specially crafted HTTP requests to the affected system, an attacker with elevated privileges can trigger the buffer overflow vulnerabilities within the set_qos function, potentially leading to arbitrary code execution.

Mitigation and Prevention

Effective mitigation strategies are crucial to safeguard systems from CVE-2023-25093 and prevent potential exploitation.

Immediate Steps to Take

Update to a patched version: Ensure that the Milesight UR32L firmware is updated to a secure version that addresses the buffer overflow vulnerabilities.
Restrict privileges: Limit user privileges to minimize the impact of potential exploitation.
Network segmentation: Implement network segmentation to isolate critical systems from potential attacks.

Long-Term Security Practices

Regular vulnerability assessments: Conduct routine security assessments to identify and address vulnerabilities promptly.
Security awareness training: Educate users on best practices to enhance cybersecurity posture.
Implement intrusion detection and prevention systems: Deploy IDS/IPS solutions to detect and thwart potential attacks.

Patching and Updates

Stay informed on security advisories and patches released by Milesight for UR32L devices. Timely application of security updates is essential to mitigate the risk posed by CVE-2023-25093.