Description
During login to the web server in "Sante PACS Server.exe", OpenSSL function EVP_DecryptUpdate is called to decrypt the username and password. A fixed 0x80-byte stack-based buffer is passed to the function as the output buffer. A stack-based buffer overflow exists if a long encrypted username or password is supplied by an unauthenticated remote attacker.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-6300
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-6300 pertains to a stack-based buffer overflow in the "Sante PACS Server.exe" application. Specifically, the issue arises during the login process when the OpenSSL function EVP_DecryptUpdate is used to decrypt the username and password. The function utilizes a fixed 0x80-byte stack-based buffer, which can be overflowed if a long encrypted username or password is supplied by an unauthenticated remote attacker.
Severity Evaluation:
- Base Score: 9.8 (Critical)
- Base Score Version: CVSS 3.1
- Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high base score indicates a critical vulnerability due to the following factors:
- Attack Vector (AV:N): The vulnerability can be exploited over the network.
- Attack Complexity (AC:L): The attack requires low complexity.
- Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
- User Interaction (UI:N): No user interaction is required.
- Scope (S:U): The vulnerability does not change the security scope.
- Confidentiality (C:H), Integrity (I:H), Availability (A:H): All three security properties are highly impacted.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Unauthenticated Attack: An attacker can exploit this vulnerability by sending a specially crafted login request with a long encrypted username or password.
- Network-Based Exploitation: The attack can be conducted over the network, making it accessible to a wide range of potential attackers.
Exploitation Methods:
- Buffer Overflow: By supplying a long encrypted username or password, an attacker can overflow the 0x80-byte stack-based buffer, leading to arbitrary code execution or a denial of service (DoS).
- Code Injection: The overflow can be used to inject malicious code, potentially leading to remote code execution (RCE).
3. Affected Systems and Software Versions
Affected Systems:
- Product: Sante PACS Server
- Version: 4.1.0
- Vendor: Santesoft
Additional Considerations:
- Other versions of the Sante PACS Server may also be affected if they share the same codebase or have not been patched for this specific vulnerability.
4. Recommended Mitigation Strategies
Immediate Mitigation:
- Patching: Apply the vendor-provided patch as soon as it becomes available.
- Network Segmentation: Isolate the affected server from the public network to limit exposure.
- Input Validation: Implement strict input validation to ensure that usernames and passwords do not exceed the buffer size.
Long-Term Mitigation:
- Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.
- Security Training: Educate developers on secure coding practices to prevent future buffer overflow issues.
- Regular Updates: Ensure that all software components, including OpenSSL, are regularly updated to the latest versions.
5. Impact on European Cybersecurity Landscape
The vulnerability in the Sante PACS Server, which is likely used in healthcare settings, poses a significant risk to the European cybersecurity landscape. Healthcare data is highly sensitive, and a breach could lead to severe consequences, including:
- Data Breaches: Unauthorized access to patient data.
- Service Disruption: Potential disruption of critical healthcare services.
- Regulatory Compliance: Violation of GDPR and other regulatory requirements, leading to legal and financial repercussions.
6. Technical Details for Security Professionals
Vulnerability Details:
- Function Affected:
EVP_DecryptUpdatein OpenSSL. - Buffer Size: 0x80 bytes (128 bytes).
- Exploitation Condition: Long encrypted username or password.
Detection and Monitoring:
- Log Analysis: Monitor login attempts and look for unusually long input fields.
- Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network traffic patterns.
- Anomaly Detection: Implement anomaly detection mechanisms to identify deviations from normal login behavior.
References:
Conclusion: The vulnerability EUVD-2025-6300 is critical and requires immediate attention. Organizations using the Sante PACS Server should prioritize patching and implementing the recommended mitigation strategies to protect against potential exploitation. The impact on the European cybersecurity landscape, particularly in the healthcare sector, underscores the urgency of addressing this issue promptly.