CVE-2023-25089 : Exploit Details and Defense Strategies

This CVE record pertains to multiple buffer overflow vulnerabilities found in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, allowing for arbitrary code execution through specially crafted HTTP requests. The vulnerabilities were discovered by Francesco Benvenuto of Cisco Talos and have been assigned a high severity CVSS base score of 7.2.

Understanding CVE-2023-25089

This section will delve into the details of CVE-2023-25089, including its description, impact, technical details, and mitigation strategies.

What is CVE-2023-25089?

CVE-2023-25089 involves buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5 due to the use of an unsafe sprintf pattern. An attacker with high privileges can exploit these vulnerabilities by sending specially crafted HTTP requests, potentially leading to arbitrary code execution.

The Impact of CVE-2023-25089

The impact of CVE-2023-25089 is significant, with the potential for high confidentiality, integrity, and availability impact. Attackers could leverage these vulnerabilities to execute arbitrary code on affected systems, posing a severe risk to data security and system operations.

Technical Details of CVE-2023-25089

In this section, we will explore the vulnerability description, affected systems and versions, as well as the exploitation mechanism of CVE-2023-25089.

Vulnerability Description

The vulnerability arises from multiple buffer overflow issues in the handle_interface_acl function of the vtysh_ubus binary. Specifically, the issue occurs when the interface variable is in_acl is set to -1, leading to the potential for arbitrary code execution through crafted HTTP requests.

Affected Systems and Versions

Milesight UR32L devices running version v32.3.0.5 are impacted by CVE-2023-25089. Users of this specific product version should take immediate action to address these vulnerabilities.

Exploitation Mechanism

By sending specially crafted HTTP requests to the vulnerable device, an attacker with high privileges can trigger the buffer overflow vulnerabilities in the vtysh_ubus binary. This could result in the execution of arbitrary code and compromise the security and integrity of the system.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-25089, users and administrators are advised to take immediate steps, adopt long-term security practices, and ensure timely patching and updates to address the vulnerabilities effectively.

Immediate Steps to Take

Users of Milesight UR32L v32.3.0.5 should implement security measures such as restricting network access, monitoring network traffic for suspicious activity, and applying vendor-provided patches or workarounds to mitigate the potential exploitation of these vulnerabilities.

Long-Term Security Practices

It is crucial for organizations to enforce secure coding practices, conduct regular security assessments and audits, and stay updated on the latest security advisories to bolster their overall cybersecurity posture and prevent similar vulnerabilities from being exploited in the future.

Patching and Updates

Milesight users are strongly encouraged to apply patches provided by the vendor to address the buffer overflow vulnerabilities in the vtysh_ubus binary. Timely updates and maintenance of software and firmware can significantly reduce the likelihood of successful exploitation and enhance the overall security of the affected systems.