CVE-2023-25101 Explained : Impact and Mitigation

This CVE-2023-25101 was published on July 6, 2023, after being reserved on February 2, 2023, by Talos. It involves multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, which can result in arbitrary code execution. The vulnerability was discovered by Francesco Benvenuto of Cisco Talos.

Understanding CVE-2023-25101

This section will delve into the details of CVE-2023-25101, shedding light on what it is and the impact it carries.

What is CVE-2023-25101?

The CVE-2023-25101 involves buffer overflow vulnerabilities present in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. These vulnerabilities stem from an unsafe sprintf pattern, allowing an attacker to execute arbitrary code by sending a specially crafted HTTP request. The buffer overflow specifically occurs in the set_dmvpn function with the gre_key variable.

The Impact of CVE-2023-25101

With a CVSS v3.1 base score of 7.2 and a high severity level, this vulnerability can have a significant impact. Attackers with high privileges can exploit these vulnerabilities to potentially compromise confidentiality, integrity, and availability of the affected system.

Technical Details of CVE-2023-25101

In this section, we will explore the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability arises from multiple buffer overflow issues originating from the use of an unsafe sprintf pattern in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. This can be exploited through specially crafted HTTP requests, leading to arbitrary code execution.

Affected Systems and Versions

The specifically affected system in this CVE is Milesight UR32L with version v32.3.0.5. Users with this particular setup should take immediate action to mitigate the risks associated with this vulnerability.

Exploitation Mechanism

By exploiting the buffer overflow vulnerabilities in the set_dmvpn function with the gre_key variable, an attacker with high privileges can send crafted HTTP requests to execute arbitrary code, potentially compromising the system.

Mitigation and Prevention

To safeguard against CVE-2023-25101, it's crucial to take immediate steps to mitigate the risks and implement long-term security practices. Regular patching and updates are essential to address vulnerabilities effectively.

Immediate Steps to Take

Users of Milesight UR32L v32.3.0.5 should consider implementing security measures to protect their systems from potential exploitation.
It is advisable to restrict access and monitor HTTP requests to detect any suspicious activities indicating an attempt to exploit these vulnerabilities.

Long-Term Security Practices

Enhance network security by implementing access controls, intrusion detection systems, and regular security audits to identify and address vulnerabilities proactively.
Educate users and administrators about safe practices to prevent the execution of arbitrary code through malicious HTTP requests.

Patching and Updates

Stay informed about security updates and patches released by Milesight for UR32L devices. Promptly apply these patches to secure the system and prevent exploitation of known vulnerabilities.