CVE-2025-30042 Overview
CVE-2025-30042 is a critical authentication bypass vulnerability in the CGM CLININET healthcare information system. The vulnerability stems from a fundamental design flaw in the smart card authentication implementation where authentication is conducted locally on the client device, and only the certificate number is used for access verification rather than proper cryptographic validation. This allows an attacker with knowledge of a valid certificate number to authenticate without physical possession of the smart card or the associated private key.
Critical Impact
An attacker on an adjacent network can completely bypass smart card authentication by providing only a certificate number, gaining unauthorized access to sensitive healthcare data and systems without proper credentials.
Affected Products
- CGM CLININET Healthcare Information System
Discovery Timeline
- 2026-03-02 - CVE CVE-2025-30042 published to NVD
- 2026-03-02 - Last updated in NVD database
Technical Details for CVE-2025-30042
Vulnerability Analysis
This vulnerability is classified under CWE-603 (Use of Client-Side Authentication), which represents a critical security anti-pattern. The CGM CLININET system implements smart card authentication in a fundamentally flawed manner by performing the authentication decision on the client device rather than on the server.
In a properly implemented smart card authentication system, the server issues a cryptographic challenge that must be signed using the private key stored on the smart card. This proves both possession of the physical card and access to the private key. However, CGM CLININET bypasses this security model entirely by only transmitting the certificate number to the server for verification.
The attack vector requires adjacent network access, meaning an attacker must be on the same network segment as the target system. Given that healthcare environments often have flat network architectures or shared VLANs, this attack surface may be broader than initially apparent. No user interaction is required, and the attacker does not need prior authentication to exploit this vulnerability.
Root Cause
The root cause is the use of client-side authentication combined with improper authentication verification (CWE-603). The system trusts the client to perform authentication verification rather than implementing server-side cryptographic challenge-response mechanisms. The certificate number alone—which is not a secret and can be observed or enumerated—is treated as sufficient proof of identity.
Attack Vector
The vulnerability can be exploited from an adjacent network position. An attacker who obtains or guesses a valid certificate number can authenticate to the CGM CLININET system without possessing the corresponding smart card or private key. Certificate numbers may be exposed through:
- Network traffic interception on the local segment
- Social engineering or observation of legitimate users
- Enumeration attacks if certificate numbers follow predictable patterns
- Access to system logs or databases that store certificate identifiers
The attack does not require sophisticated tools or techniques—once a certificate number is known, authentication bypass is straightforward because the server performs no cryptographic verification of smart card possession.
Detection Methods for CVE-2025-30042
Indicators of Compromise
- Authentication events occurring without corresponding smart card reader activity on client devices
- Login attempts from systems that do not have smart card hardware attached
- Multiple authentication sessions using the same certificate number from different client machines
- Authentication patterns inconsistent with physical user presence or working hours
Detection Strategies
- Implement logging correlation between smart card reader events and authentication requests
- Monitor for authentication attempts from IP addresses or hostnames not associated with smart card-enabled workstations
- Audit authentication logs for certificate numbers used across multiple concurrent sessions
- Deploy network monitoring to detect authentication traffic patterns from unexpected network segments
Monitoring Recommendations
- Enable comprehensive authentication logging including source IP, timestamp, and certificate number
- Establish baseline authentication patterns for legitimate users and alert on deviations
- Monitor for reconnaissance activity such as enumeration attempts against the authentication service
- Implement real-time alerting for authentication from unauthorized network segments
How to Mitigate CVE-2025-30042
Immediate Actions Required
- Contact CGM vendor to obtain information about available patches or updated versions addressing this vulnerability
- Implement network segmentation to restrict access to CGM CLININET systems from adjacent networks
- Review and audit authentication logs for evidence of exploitation
- Consider implementing additional authentication factors at the network level while awaiting a vendor fix
Patch Information
Refer to the CERT PL CVE-2025-10350 Analysis for detailed technical information and remediation guidance. Contact CGM directly through their product support channels to inquire about security updates addressing this authentication bypass vulnerability.
Workarounds
- Implement network access controls (VLANs, firewalls) to restrict which systems can communicate with CGM CLININET authentication services
- Deploy a VPN or additional authentication gateway requiring multi-factor authentication before reaching the application
- Enable enhanced logging and monitoring on all authentication events to detect potential exploitation attempts
- Consider temporarily disabling smart card authentication in favor of alternative authentication mechanisms until a fix is available, if operationally feasible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
