CVE-2023-25084 : Exploit Details and Defense Strategies

This CVE-2023-25084 was recently published on July 6, 2023, by Talos. It involves multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, potentially leading to arbitrary code execution. The exploit is triggered by sending a specially crafted HTTP request, which can be done by an attacker with high privileges.

Understanding CVE-2023-25084

This section will delve into the details surrounding CVE-2023-25084.

What is CVE-2023-25084?

The CVE-2023-25084 vulnerability 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. This flaw allows an attacker to execute arbitrary code using specially crafted HTTP requests.

The Impact of CVE-2023-25084

The impact of this vulnerability is significant, with a base CVSS score of 7.2, classifying it as a high severity issue. An attacker exploiting this vulnerability can achieve high impact on confidentiality, integrity, and availability of the affected system.

Technical Details of CVE-2023-25084

Let's explore the technical aspects of CVE-2023-25084.

Vulnerability Description

The vulnerability arises from multiple buffer overflow flaws in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. Specifically, the issue lies in the unsafe sprintf pattern used, allowing for arbitrary code execution through crafted HTTP requests.

Affected Systems and Versions

Milesight UR32L v32.3.0.5 is the affected product version by this vulnerability. Users of this version are at risk of exploitation unless mitigations are applied promptly.

Exploitation Mechanism

The buffer overflow occurs in the firewall_handler_set function with the ip, mac, and description variables. An attacker with high privileges can exploit this by sending crafted HTTP requests to the targeted system.

Mitigation and Prevention

Here are some crucial steps to mitigate the risks posed by CVE-2023-25084.

Immediate Steps to Take

Organizations using Milesight UR32L v32.3.0.5 should apply the recommended patches as soon as they are made available.
Implement network segmentation to limit the impact of potential attacks targeting this vulnerability.
Monitor network traffic for any suspicious HTTP requests that could indicate an exploitation attempt.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities promptly.
Conduct regular security assessments and penetration testing to identify and remediate potential weaknesses in the system.
Educate users and IT staff about safe practices to mitigate the risks of exploitation through social engineering tactics.

Patching and Updates

Stay informed about security updates and patches released by Milesight for the UR32L product line. Regularly check for firmware updates and apply them to ensure the system is protected against known vulnerabilities.