CVE-2026-25605 Overview
A vulnerability has been identified in Siemens SICAM SIAPP SDK affecting all versions prior to V2.1.7. The affected application performs file deletion without properly validating the file path or target. An attacker could delete files or sockets that the affected process has permission to remove, potentially resulting in denial of service or service disruption.
Critical Impact
This vulnerability allows attackers with local access to delete arbitrary files or sockets, potentially disrupting critical industrial control system operations and causing denial of service conditions.
Affected Products
- Siemens SICAM SIAPP SDK (All versions < V2.1.7)
Discovery Timeline
- 2026-03-10 - CVE CVE-2026-25605 published to NVD
- 2026-03-12 - Last updated in NVD database
Technical Details for CVE-2026-25605
Vulnerability Analysis
This vulnerability falls under CWE-73 (External Control of File Name or Path), which occurs when software allows user input to control or influence paths or file names used in file system operations. In the context of SICAM SIAPP SDK, the application fails to properly validate file paths before executing deletion operations, creating an opportunity for attackers to manipulate the target of delete operations.
The SICAM SIAPP SDK is used in industrial automation and energy management contexts, making this vulnerability particularly concerning for operational technology (OT) environments. While requiring local access reduces the attack surface, compromised systems or insider threats could leverage this flaw to disrupt critical infrastructure operations.
Root Cause
The root cause of this vulnerability is insufficient input validation in the file deletion functionality. The application does not properly sanitize or validate the file path parameter before passing it to the underlying file system deletion operation. This allows an attacker to specify arbitrary file paths, potentially targeting critical system files, configuration files, or socket files that the process has permission to delete.
Attack Vector
The attack requires local access to the affected system. An attacker would need to supply a malicious file path to the vulnerable file deletion function. Since no user interaction is required and the attack complexity is considered high, exploitation would typically involve:
- Gaining local access to a system running the vulnerable SICAM SIAPP SDK
- Identifying the vulnerable file deletion functionality
- Crafting a malicious path pointing to critical files or sockets
- Triggering the deletion operation to cause denial of service
The vulnerability mechanism involves improper path validation before file system operations. When the application receives a file path for deletion, it fails to verify that the path points to an expected location or file type. An attacker can exploit this by providing paths that traverse outside intended directories or target critical system components. For detailed technical information, refer to the Siemens Security Advisory SSA-903736.
Detection Methods for CVE-2026-25605
Indicators of Compromise
- Unexpected deletion of system files or configuration files on systems running SICAM SIAPP SDK
- Missing socket files that should be present for inter-process communication
- Application crashes or service failures following suspicious file system activity
- Audit log entries showing deletion of files outside expected application directories
Detection Strategies
- Monitor file system audit logs for deletion operations performed by SICAM SIAPP SDK processes targeting unexpected paths
- Implement file integrity monitoring (FIM) on critical system directories and configuration files
- Alert on deletion of socket files in /var/run or similar system directories by non-administrative processes
- Correlate application logs with file system events to identify suspicious deletion patterns
Monitoring Recommendations
- Enable detailed file system auditing on systems running SICAM SIAPP SDK versions prior to V2.1.7
- Configure SIEM rules to alert on file deletion events from SICAM-related processes targeting sensitive directories
- Implement real-time monitoring of critical OT system files and directories
- Review access logs for any unauthorized local access attempts to SICAM SIAPP SDK systems
How to Mitigate CVE-2026-25605
Immediate Actions Required
- Upgrade SICAM SIAPP SDK to version V2.1.7 or later immediately
- Review systems for evidence of exploitation by checking for unexpected file deletions
- Restrict local access to systems running vulnerable versions to trusted personnel only
- Implement defense-in-depth controls including file system access controls and monitoring
Patch Information
Siemens has released SICAM SIAPP SDK version V2.1.7 to address this vulnerability. Customers should obtain the updated software through their normal Siemens support channels. Detailed patch information and installation guidance is available in the Siemens Security Advisory SSA-903736.
Workarounds
- Implement strict file system permissions to limit the files that the SICAM SIAPP SDK process can delete
- Use application whitelisting to restrict which applications can perform file operations on critical directories
- Deploy file integrity monitoring to detect and alert on unauthorized file deletions
- Network segmentation to limit access to systems running vulnerable SICAM SIAPP SDK versions
# Example: Restrict file permissions for SICAM SIAPP SDK directories
# Limit write/delete access to essential directories only
chmod 755 /opt/siemens/sicam/
chown root:root /opt/siemens/sicam/
# Enable auditd monitoring for file deletion events
auditctl -w /opt/siemens/sicam/ -p wa -k sicam_file_monitor
auditctl -w /var/run/ -p wa -k socket_monitor
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
