CVE-2023-25115 : What You Need to Know

This CVE record, assigned by Talos, highlights multiple buffer overflow vulnerabilities present in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. These vulnerabilities are caused by an unsafe sprintf pattern, allowing a specially crafted HTTP request to potentially lead to arbitrary code execution. An attacker with high privileges can exploit these vulnerabilities by sending malicious HTTP requests, particularly affecting the set_openvpn_client function within the binary.

Understanding CVE-2023-25115

This section breaks down the critical aspects of CVE-2023-25115 to enhance comprehension and awareness regarding the identified vulnerabilities.

What is CVE-2023-25115?

CVE-2023-25115 refers to multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. These vulnerabilities stem from the utilization of an unsafe sprintf pattern, enabling malicious actors to achieve arbitrary code execution through specially crafted HTTP requests.

The Impact of CVE-2023-25115

The impact of CVE-2023-25115 is categorized as high severity (7.2), with confidentiality, integrity, and availability being significantly compromised. The vulnerabilities can be exploited by attackers with high privileges, posing a serious risk to system security and data integrity.

Technical Details of CVE-2023-25115

Delving into the technical specifics of CVE-2023-25115 provides insights into the vulnerability, affected systems, and the exploitation mechanisms.

Vulnerability Description

The vulnerability arises due to multiple buffer overflow issues in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, attributed to the use of an insecure sprintf pattern. This flaw can be exploited through specifically crafted HTTP requests, leading to potential arbitrary code execution.

Affected Systems and Versions

The impacted system identified in this CVE is the Milesight UR32L running version v32.3.0.5. Users of this specific version are susceptible to the buffer overflow vulnerabilities in the vtysh_ubus binary.

Exploitation Mechanism

By leveraging the buffer overflow vulnerabilities in the set_openvpn_client function with the remote_ip and port variables, threat actors can send malicious HTTP requests to trigger the vulnerabilities. This can result in arbitrary code execution, compromising the security and functionality of the system.

Mitigation and Prevention

Understanding how to mitigate and prevent vulnerabilities like CVE-2023-25115 is crucial for safeguarding systems and data from potential exploits.

Immediate Steps to Take

Users should promptly update the affected software to the latest version released by Milesight.
Implement network segmentation and access controls to limit the attack surface for potential threat actors.

Long-Term Security Practices

Regularly conduct security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate system administrators and users on best practices for securely configuring and managing network devices.

Patching and Updates

Stay informed about security advisories from the vendor and promptly apply patches and updates to address known vulnerabilities.
Establish a robust patch management process to ensure timely deployment of security fixes across all systems and devices.