CVE-2023-25090 : What You Need to Know

This CVE-2023-25090 was 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, leading to arbitrary code execution. The vulnerability is assigned the CVE ID CVE-2023-25090 and falls under CWE-121: Stack-based Buffer Overflow.

Understanding CVE-2023-25090

This section will delve into what CVE-2023-25090 entails, its impact, technical details, and mitigation strategies.

What is CVE-2023-25090?

CVE-2023-25090 exposes multiple buffer overflow vulnerabilities in Milesight UR32L v32.3.0.5 due to an unsafe sprintf pattern in the vtysh_ubus binary. An attacker with high privileges can exploit this issue by sending specially crafted HTTP requests, potentially leading to arbitrary code execution.

The Impact of CVE-2023-25090

The impact of CVE-2023-25090 is severe, with a CVSSv3 base score of 7.2 out of 10 (High). This vulnerability can allow an attacker to execute arbitrary code by manipulating HTTP requests, compromising the confidentiality, integrity, and availability of the affected system.

Technical Details of CVE-2023-25090

Understanding the technical aspects of CVE-2023-25090 can help security professionals and system administrators take appropriate actions to secure their systems.

Vulnerability Description

The vulnerabilities in the vtysh_ubus binary of Milesight UR32L v32.3.0.5 are caused by buffer overflows in the handle_interface_acl function with the interface and in_acl variables. These vulnerabilities stem from the improper use of sprintf patterns, enabling attackers to exploit the system through crafted HTTP requests.

Affected Systems and Versions

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

Exploitation Mechanism

By sending malicious HTTP requests to the vulnerable vtysh_ubus binary within Milesight UR32L v32.3.0.5, attackers with high privileges can trigger the buffer overflow vulnerabilities. This can result in the execution of arbitrary code on the system, potentially leading to a compromise.

Mitigation and Prevention

Taking immediate steps to address CVE-2023-25090 can help prevent potential exploitation and protect the integrity of the affected systems.

Immediate Steps to Take

Apply Patches: Check for vendor-provided patches or updates to address the buffer overflow vulnerabilities in Milesight UR32L v32.3.0.5.
Restrict Network Access: Limit network access to vulnerable systems and ensure that only necessary connections are allowed.
Monitor Network Traffic: Monitor incoming HTTP requests for any suspicious activity that could indicate exploitation attempts.

Long-Term Security Practices

Regular Security Audits: Conduct routine security audits to identify and remediate potential vulnerabilities across the network.
Employee Training: Educate employees on best security practices, including identifying and reporting suspicious activities.
Implement Defense-in-Depth: Employ multiple layers of security controls to mitigate the impact of successful exploitation.

Patching and Updates

Stay informed about security updates and patches released by Milesight for the UR32L v32.3.0.5 version. Regularly apply these updates to ensure that known vulnerabilities, such as the buffer overflow issues highlighted in CVE-2023-25090, are addressed promptly.