CVE-2023-25095 : What You Need to Know

This CVE record was published on July 6, 2023, by Talos. The vulnerability affects Milesight UR32L version v32.3.0.5, exposing it to multiple buffer overflow vulnerabilities due to the unsafe sprintf pattern used in the vtysh_ubus binary. Exploiting this vulnerability through a specially crafted HTTP request can lead to arbitrary code execution, posing a significant risk to systems with the affected version installed.

Understanding CVE-2023-25095

CVE-2023-25095 highlights the presence of multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, which can be exploited by an attacker to execute arbitrary code by sending specially crafted HTTP requests.

What is CVE-2023-25095?

The vulnerability in CVE-2023-25095 arises from the use of an unsafe sprintf pattern in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. Attackers with high privileges can leverage this flaw to trigger buffer overflow in the set_qos function, enabling them to execute arbitrary code.

The Impact of CVE-2023-25095

The impact of CVE-2023-25095 is significant, with a CVSS v3.1 base score of 7.2 (High). The confidentiality, integrity, and availability of affected systems are all at risk, making it crucial to address this vulnerability promptly.

Technical Details of CVE-2023-25095

The vulnerability is classified under CWE-121: Stack-based Buffer Overflow. By exploiting the sprintf pattern in the vtysh_ubus binary, attackers can execute arbitrary code through specially crafted HTTP requests, posing a severe security risk.

Vulnerability Description

The vulnerability in CVE-2023-25095 allows for buffer overflow in the set_qos function of Milesight UR32L v32.3.0.5, with two possible format strings that represent negated commands. This buffer overflow can be triggered by sending crafted HTTP requests.

Affected Systems and Versions

The affected system is the Milesight UR32L with version v32.3.0.5. Systems running this specific version are susceptible to the buffer overflow vulnerabilities disclosed in this CVE.

Exploitation Mechanism

Exploiting CVE-2023-25095 involves sending specially crafted HTTP requests to the vtysh_ubus binary of Milesight UR32L v32.3.0.5. By leveraging the unsafe sprintf pattern, attackers can achieve arbitrary code execution on the targeted system.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2023-25095 and implement long-term security practices to enhance the overall resilience of the system.

Immediate Steps to Take

Disable or restrict access to the vulnerable binary or service to minimize the attack surface.
Apply vendor-supplied patches or updates to address the buffer overflow vulnerabilities in Milesight UR32L v32.3.0.5.
Monitor network traffic for any suspicious HTTP requests that could potentially exploit this vulnerability.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities and enhance overall system security.
Conduct security audits and assessments to identify and address potential weaknesses in the system.
Implement robust access control measures to limit privileges and restrict unauthorized access to critical system components.

Patching and Updates

Stay informed about security advisories and patches released by Milesight for the UR32L device. Timely implementation of patches is essential to mitigate the risks associated with CVE-2023-25095 and ensure the security of the system.