CVE-2023-35796 Explained : Impact and Mitigation

A vulnerability has been identified in SINEMA Server V14 that allows for a stored cross-site scripting (XSS) attack leading to arbitrary code execution with

SYSTEM

privileges on the application server.

Understanding CVE-2023-35796

This CVE-2023-35796 affects SINEMA Server V14 by Siemens, where improper sanitization of SNMP configuration data from monitored devices can lead to a stored XSS attack.

What is CVE-2023-35796?

CVE-2023-35796 is a vulnerability in SINEMA Server V14 (All versions) that allows an attacker to perform a stored cross-site scripting attack, potentially resulting in arbitrary code execution with

SYSTEM

privileges on the application server.

The Impact of CVE-2023-35796

The impact of this vulnerability is rated as HIGH, with a CVSS base score of 8.3. An attacker with access to a monitored device could exploit this issue to execute arbitrary code with elevated privileges on the server.

Technical Details of CVE-2023-35796

This vulnerability is categorized as CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting). The affected application is SINEMA Server V14, with all versions being susceptible.

Vulnerability Description

The vulnerability arises due to the improper sanitization of SNMP configuration data retrieved from monitored devices, enabling a stored cross-site scripting (XSS) attack.

Affected Systems and Versions

Siemens SINEMA Server V14 in all versions is affected by CVE-2023-35796 due to the lack of proper input validation.

Exploitation Mechanism

An attacker with access to a monitored device can exploit this vulnerability by injecting malicious code via SNMP configuration data, leading to a stored XSS attack and potential arbitrary code execution with elevated privileges.

Mitigation and Prevention

To address CVE-2023-35796, immediate steps should be taken to mitigate the risk and prevent unauthorized access.

Immediate Steps to Take

Update Siemens SINEMA Server V14 to the latest patched version to fix the vulnerability.
Implement network segmentation to restrict access to the application server.

Long-Term Security Practices

Regularly monitor and audit SNMP configurations and data inputs to ensure they are properly sanitized.
Educate users on safe practices to prevent XSS attacks and privilege escalation.

Patching and Updates

Stay informed about security updates from Siemens and apply patches promptly to safeguard against known vulnerabilities.