CVE-2023-25103 : Security Advisory and Response

This CVE-2023-25103 pertains to multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, leading to arbitrary code execution through specially crafted HTTP requests. The vulnerability was discovered by Francesco Benvenuto of Cisco Talos and poses a high severity risk.

Understanding CVE-2023-25103

This section delves into the details of CVE-2023-25103, outlining what it is, its impact, technical details, and mitigation methods.

What is CVE-2023-25103?

CVE-2023-25103 involves multiple buffer overflow vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5 due to an unsafe sprintf pattern. Attackers with high privileges can exploit these vulnerabilities by sending specially crafted HTTP requests, potentially executing arbitrary code.

The Impact of CVE-2023-25103

The impact of CVE-2023-25103 is significant, with the potential for attackers to execute arbitrary code by exploiting the buffer overflow vulnerabilities in the affected binary. This could result in a compromise of confidentiality, integrity, and availability of the system.

Technical Details of CVE-2023-25103

This section provides a deeper dive into the technical aspects of CVE-2023-25103, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from multiple buffer overflow flaws in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, attributed to the use of an unsafe sprintf pattern. Specifically, the buffer overflow occurs in the set_dmvpn function with the gre_ip and the gre_mask variables.

Affected Systems and Versions

The affected system identified in this CVE is the Milesight UR32L running version v32.3.0.5. Users operating this specific version are at risk of exploitation through specially crafted HTTP requests.

Exploitation Mechanism

Exploiting CVE-2023-25103 involves sending malicious HTTP requests to the vtysh_ubus binary of the vulnerable system. Attackers with high privileges can capitalize on the buffer overflow vulnerabilities to trigger arbitrary code execution.

Mitigation and Prevention

When dealing with CVE-2023-25103, taking proactive measures to mitigate the risks associated with the vulnerabilities is crucial. This section outlines immediate steps to take, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

To address CVE-2023-25103, users should consider implementing network security controls, restricting access to vulnerable systems, and monitoring for any unusual HTTP requests. It is advisable to apply security patches promptly to eliminate the identified buffer overflow vulnerabilities.

Long-Term Security Practices

In the long term, organizations can enhance their security posture by conducting regular security assessments, implementing secure coding practices, and staying informed about potential vulnerabilities affecting their systems. Employee training on cybersecurity best practices can also help mitigate risks associated with similar vulnerabilities in the future.

Patching and Updates

Regularly updating software and firmware, particularly in relation to the affected system (Milesight UR32L v32.3.0.5), is crucial to address known vulnerabilities and protect against potential exploitation. Timely application of patches provided by the vendor can help secure the system and prevent unauthorized code execution.