CVE-2023-25100 : What You Need to Know

This CVE-2023-25100 involves multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, leading to arbitrary code execution through specially crafted HTTP requests. The vulnerability was discovered by Francesco Benvenuto of Cisco Talos and has a high severity rating.

Understanding CVE-2023-25100

This section will cover the key aspects of CVE-2023-25100, including its description, impact, technical details, and mitigation strategies.

What is CVE-2023-25100?

CVE-2023-25100 is a vulnerability in the vtysh_ubus binary of Milesight UR32L v32.3.0.5 that allows attackers to execute arbitrary code through crafted HTTP requests. The vulnerability stems from the use of an unsafe sprintf pattern in the set_qos function with the default_class variable.

The Impact of CVE-2023-25100

The impact of CVE-2023-25100 is significant, as it allows an attacker with high privileges to exploit the buffer overflow vulnerabilities and execute arbitrary code. This can lead to a compromise of confidentiality, integrity, and availability of the affected system.

Technical Details of CVE-2023-25100

In this section, we will delve into the technical aspects of CVE-2023-25100, including the vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability in the vtysh_ubus binary of Milesight UR32L v32.3.0.5 stems from multiple buffer overflow issues due to the use of an unsafe sprintf pattern. Attackers can exploit this flaw by sending specially crafted HTTP requests to trigger arbitrary code execution.

Affected Systems and Versions

Milesight UR32L v32.3.0.5 is the affected version by CVE-2023-25100 due to the buffer overflow vulnerabilities present in the vtysh_ubus binary.

Exploitation Mechanism

By sending malicious HTTP requests to the set_qos function with the default_class variable, an attacker with high privileges can exploit the buffer overflow vulnerabilities to execute arbitrary code on the system.

Mitigation and Prevention

Mitigating the risks associated with CVE-2023-25100 is crucial to maintaining the security of the affected systems. This section outlines immediate steps to take, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

Implement network-level controls to restrict access to vulnerable services.
Monitor network traffic for any suspicious activity related to HTTP requests.
Apply vendor-supplied patches or workarounds to address the vulnerability.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify and remediate vulnerabilities.
Educate system administrators and users about safe coding practices and security best practices.
Keep systems up to date with the latest security patches and updates to mitigate potential risks.

Patching and Updates

Vendor patches and updates should be applied promptly to mitigate the CVE-2023-25100 vulnerability. Regularly check for security advisories from Milesight and apply recommended patches to ensure the security of the UR32L devices.