Attack Chain

1. An attacker gains initial access to the HiSecOS web server with operator or auditor privileges.
2. The attacker crafts a malicious packet designed to exploit the privilege escalation vulnerability.
3. The attacker sends the crafted packet to the HiSecOS web server.
4. The web server processes the malicious packet without proper validation or sanitization.
5. Due to the vulnerability, the attacker’s session is granted administrator privileges.
6. The attacker leverages the newly acquired administrator privileges to perform unauthorized actions.
7. The attacker gains full control of the HiSecOS device.

Impact

Successful exploitation of CVE-2023-7342 can have severe consequences. An attacker with administrator privileges can reconfigure the HiSecOS device, access sensitive data, disrupt operations, and potentially use the compromised device as a pivot point for further attacks within the network. Given the high CVSS score of 8.8, this vulnerability represents a critical threat that requires immediate attention and remediation. The number of potential victims is dependent on the install base of the affected HiSecOS web server.

Recommendation

• Apply the security patch or upgrade to a version of HiSecOS web server that resolves CVE-2023-7342, as documented in the Belden security bulletin referenced in the advisory.
• Implement network segmentation to limit the potential impact of a successful exploit by restricting access to critical systems from compromised HiSecOS devices.
• Deploy the Sigma rule provided below to detect potential exploitation attempts against the HiSecOS web server, monitoring for abnormal web requests.