CVE-2023-25099 : Exploit Details and Defense Strategies

This CVE record was published on July 6, 2023, with a base severity score of 7.2, indicating a high impact vulnerability affecting the Milesight UR32L v32.3.0.5 device. The vulnerability was discovered by Francesco Benvenuto of Cisco Talos and is attributed to multiple buffer overflow vulnerabilities in the vtysh_ubus binary due to the use of an unsafe sprintf pattern.

Understanding CVE-2023-25099

CVE-2023-25099 refers to multiple buffer overflow vulnerabilities affecting the Milesight UR32L v32.3.0.5 device, which could allow an attacker to execute arbitrary code by sending a specially crafted HTTP request.

What is CVE-2023-25099?

The vulnerability stems from the unsafe sprintf pattern used in the vtysh_ubus binary of Milesight UR32L v32.3.0.5. An attacker with high privileges can exploit this vulnerability by sending malicious HTTP requests, triggering buffer overflows in the set_qos function.

The Impact of CVE-2023-25099

The impact of CVE-2023-25099 is rated as high, with a base severity score of 7.2. Exploitation of this vulnerability could lead to arbitrary code execution, compromising the confidentiality, integrity, and availability of the affected system.

Technical Details of CVE-2023-25099

The vulnerability is classified under CWE-121: Stack-based Buffer Overflow and has a CVSSv3.1 base score of 7.2, indicating a high severity level.

Vulnerability Description

The vulnerability arises from multiple buffer overflow issues in the vtysh_ubus binary of Milesight UR32L v32.3.0.5, specifically in the set_qos function with the dest variable.

Affected Systems and Versions

The affected system is the Milesight UR32L running version v32.3.0.5 of the firmware.

Exploitation Mechanism

An attacker with high privileges can exploit the vulnerability by sending specially crafted HTTP requests to the vulnerable device, triggering buffer overflows and potentially gaining unauthorized access.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-25099, immediate steps should be taken along with implementing long-term security practices.

Immediate Steps to Take

Implement network segmentation to limit access to vulnerable devices.
Monitor network traffic for any suspicious activities targeting the affected system.
Apply security patches and updates provided by the vendor promptly.

Long-Term Security Practices

Conduct regular security assessments and vulnerability scans.
Train employees on best practices for network security and handling of suspicious emails or requests.
Keep systems and devices up to date with the latest security patches.

Patching and Updates

It is crucial to stay informed about security updates released by Milesight for the UR32L device and apply them as soon as they are available to mitigate the risk of exploitation associated with CVE-2023-25099.