CVE-2023-25119 : Exploit Details and Defense Strategies

This CVE-2023-25119 article provides an in-depth understanding of a critical vulnerability identified in the Milesight UR32L v32.3.0.5 system. The vulnerability arises from multiple buffer overflow issues in the vtysh_ubus binary, allowing an attacker to potentially execute arbitrary code through crafted HTTP requests.

Understanding CVE-2023-25119

This section delves into the specifics of CVE-2023-25119, including its description, impact, technical details, and mitigation strategies.

What is CVE-2023-25119?

The CVE-2023-25119 vulnerability concerns multiple buffer overflow vulnerabilities in the vtysh_ubus binary of the Milesight UR32L v32.3.0.5 system. The flaw is attributed to the utilization of an insecure sprintf pattern, enabling threat actors to exploit the system by sending specially crafted HTTP requests. Notably, the vulnerabilities are present in the set_pptp function with the remote_subnet and remote_mask variables.

The Impact of CVE-2023-25119

The impact of CVE-2023-25119 can be severe, as attackers with elevated privileges can exploit the buffer overflow vulnerabilities to execute arbitrary code. This could result in a compromise of system integrity, confidentiality, and availability, posing a significant threat to the affected environment.

Technical Details of CVE-2023-25119

This section provides a detailed analysis of the vulnerability's technical aspects, including the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability stems from multiple buffer overflow issues within the vtysh_ubus binary of the Milesight UR32L v32.3.0.5 system, triggered by the use of an unsafe sprintf pattern. Attackers can leverage this flaw by sending specially crafted HTTP requests to achieve arbitrary code execution, particularly in the set_pptp function with specific variables.

Affected Systems and Versions

The affected system in this scenario is the Milesight UR32L v32.3.0.5. Users operating this specific version are susceptible to the buffer overflow vulnerabilities present in the system, potentially leading to unauthorized code execution.

Exploitation Mechanism

Threat actors can exploit CVE-2023-25119 by sending malicious HTTP requests with crafted payloads to the vulnerable vtysh_ubus binary of the Milesight UR32L v32.3.0.5 system. Through these requests, attackers can trigger buffer overflow conditions, allowing for the execution of arbitrary code with elevated privileges.

Mitigation and Prevention

In response to CVE-2023-25119, it is crucial for organizations and users to implement immediate steps and long-term security practices to mitigate the risks posed by this vulnerability.

Immediate Steps to Take

Organizations should apply security patches released by Milesight promptly to address the buffer overflow vulnerabilities in the UR32L v32.3.0.5 system.
Network administrators are advised to monitor and restrict network access to the vulnerable binary to minimize the risk of exploitation.

Long-Term Security Practices

Employing secure coding practices and conducting regular security audits can help prevent buffer overflow vulnerabilities in software applications.
Implementing network segmentation and access controls can limit the impact of potential attacks targeting vulnerable systems.

Patching and Updates

Users of the Milesight UR32L v32.3.0.5 system should ensure they regularly update their devices with the latest security patches provided by the vendor to mitigate the CVE-2023-25119 vulnerability and enhance overall system security.