Description
MedDream PACS Server DICOM File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of MedDream PACS Server. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of DICOM files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-25827.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-16099
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-16099 is a stack-based buffer overflow in the MedDream PACS Server's DICOM file parsing functionality. This flaw allows remote attackers to execute arbitrary code without requiring authentication. The severity of this vulnerability is critical, as indicated by its CVSS base score of 9.8. The CVSS vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:
- Attack Vector (AV:N): Network-based attack.
- Attack Complexity (AC:L): Low complexity required to exploit.
- Privileges Required (PR:N): No privileges are required.
- User Interaction (UI:N): No user interaction is required.
- Scope (S:U): Unchanged.
- Confidentiality (C:H): High impact on confidentiality.
- Integrity (I:H): High impact on integrity.
- Availability (A:H): High impact on availability.
Given these factors, the vulnerability poses a significant risk to affected systems.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector involves sending a specially crafted DICOM file to the MedDream PACS Server. The lack of proper validation of the length of user-supplied data allows an attacker to overflow the stack-based buffer, leading to arbitrary code execution. Potential exploitation methods include:
- Remote Code Execution (RCE): By crafting a malicious DICOM file, an attacker can execute arbitrary code on the server, potentially leading to full system compromise.
- Denial of Service (DoS): An attacker could also exploit this vulnerability to crash the server, resulting in a denial of service.
3. Affected Systems and Software Versions
The vulnerability affects MedDream PACS Server, specifically the Premium version 7.3.3.840. Organizations using this version of the software are at risk and should prioritize mitigation efforts.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Patch Management: Apply the latest patches and updates provided by MedDream. Ensure that the PACS Server is running the most recent version that addresses this vulnerability.
- Network Segmentation: Implement network segmentation to isolate critical systems and limit the attack surface.
- Input Validation: Enhance input validation mechanisms to ensure that user-supplied data is properly validated before processing.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities and potential exploitation attempts.
- Access Controls: Implement strict access controls to limit access to the PACS Server and ensure that only authorized personnel can interact with the system.
5. Impact on European Cybersecurity Landscape
The vulnerability in MedDream PACS Server has significant implications for the European cybersecurity landscape, particularly in the healthcare sector. Medical imaging systems are critical for patient care, and any disruption or compromise can have severe consequences, including:
- Patient Safety: Compromised systems can lead to incorrect diagnoses or delays in treatment.
- Data Breaches: Sensitive patient data could be exposed or stolen, leading to privacy violations and potential legal repercussions.
- Operational Disruption: Healthcare facilities may experience operational disruptions, affecting the delivery of medical services.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerability Type: Stack-based buffer overflow.
- Affected Component: DICOM file parsing functionality.
- Exploitation: The vulnerability can be exploited by sending a maliciously crafted DICOM file to the server.
- Impact: Arbitrary code execution in the context of the service account, leading to potential full system compromise.
- Mitigation: Ensure proper input validation, apply patches, and implement robust security controls.
Conclusion
The stack-based buffer overflow vulnerability in MedDream PACS Server (EUVD-2025-16099) is a critical issue that requires immediate attention. Organizations should prioritize patching affected systems and implementing robust security measures to mitigate the risk. The potential impact on patient safety and healthcare operations underscores the urgency of addressing this vulnerability promptly.