Comprehensive Technical Analysis of CVE-2025-53912

CVE ID: CVE-2025-53912 CVSS Score: 9.6 (Critical) Affected Software: MedDream PACS Premium 7.3.6.870 Vulnerability Type: Arbitrary File Read (Information Disclosure) Source: Cisco Talos (TALOS-2025-2273)

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1. Vulnerability Assessment & Severity Evaluation

Vulnerability Overview

CVE-2025-53912 is an arbitrary file read vulnerability in the encapsulatedDoc functionality of MedDream PACS Premium 7.3.6.870, a Picture Archiving and Communication System (PACS) used in medical imaging environments. The flaw allows an unauthenticated remote attacker to read arbitrary files on the affected system by sending a specially crafted HTTP request.

CVSS v3.1 Breakdown (Score: 9.6 - Critical)

Metric	Value	Explanation
Attack Vector (AV)	Network (N)	Exploitable remotely over HTTP.
Attack Complexity (AC)	Low (L)	No special conditions required.
Privileges Required (PR)	None (N)	No authentication needed.
User Interaction (UI)	None (N)	No user interaction required.
Scope (S)	Changed (C)	Impacts confidentiality of the system.
Confidentiality (C)	High (H)	Arbitrary file read can expose sensitive data.
Integrity (I)	None (N)	No modification of data.
Availability (A)	None (N)	No impact on system availability.

Severity Justification

• Critical (9.6) due to:
  • Unauthenticated remote exploitation (no credentials required).
  • High confidentiality impact (arbitrary file read can expose sensitive medical data, credentials, or system configurations).
  • Low attack complexity (exploitable via simple HTTP requests).
  • Potential for lateral movement if combined with other vulnerabilities (e.g., credential theft from configuration files).

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Mechanism

The vulnerability resides in the encapsulatedDoc endpoint, which improperly validates or sanitizes user-supplied input when processing file read requests. An attacker can manipulate HTTP parameters to traverse directories and access files outside the intended scope.

Exploitation Steps:

1. Reconnaissance:

   • Identify the target MedDream PACS instance (e.g., via Shodan, Censys, or medical device discovery tools).
   • Determine the vulnerable endpoint (likely /encapsulatedDoc or similar).

2. Crafting the Malicious Request:

   • Send an HTTP GET/POST request with a path traversal payload (e.g., ../../../../etc/passwd).
   • Example payload (simplified):

     GET /encapsulatedDoc?file=../../../../etc/passwd HTTP/1.1
     Host: <target-ip>
     

   • Alternatively, if the endpoint expects JSON/XML input:

     {
       "file": "../../../../etc/passwd"
     }
     

3. Exfiltration of Sensitive Data:

   • The server responds with the contents of the requested file.
   • Attackers may target:
     • Configuration files (/etc/passwd, /etc/shadow, config.ini).
     • Database credentials (if stored in plaintext).
     • Medical imaging data (DICOM files, patient records).
     • Log files (containing session tokens or sensitive queries).

4. Post-Exploitation (If Combined with Other Flaws):

   • Credential theft → Lateral movement into other systems.
   • Data exfiltration → Violation of HIPAA/GDPR (if medical data is exposed).
   • Persistence → If SSH keys or API tokens are leaked.

Proof-of-Concept (PoC) Considerations

• A PoC would involve:
  • Identifying the exact parameter vulnerable to path traversal.
  • Testing for common bypass techniques (e.g., URL encoding, double encoding, null bytes).
  • Confirming file read access without authentication.

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3. Affected Systems & Software Versions

Confirmed Vulnerable:

• MedDream PACS Premium 7.3.6.870
  • Likely affects earlier versions if the encapsulatedDoc functionality was present.

Potentially Affected:

• Other MedDream PACS variants (e.g., Standard, Enterprise) if they share the same codebase.
• Third-party integrations using the vulnerable endpoint.

Unaffected Systems:

• MedDream PACS versions after 7.3.6.870 (if patched).
• Other PACS solutions (e.g., Orthanc, DCM4CHEE) unless they use the same vulnerable component.

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4. Recommended Mitigation Strategies

Immediate Actions (For Affected Organizations)

1. Apply Vendor Patches:

   • Check for updates from MedDream or Softneta (vendor of MedDream PACS).
   • If no patch is available, disable the encapsulatedDoc endpoint via configuration.

2. Network-Level Protections:

   • Restrict access to the PACS server via firewall rules (allow only trusted IPs).
   • Isolate the PACS system from the broader network (segmentation).
   • Deploy a Web Application Firewall (WAF) to block path traversal attempts (e.g., ModSecurity with OWASP Core Rule Set).

3. Temporary Workarounds:

   • Input validation: If possible, modify the application to whitelist allowed file paths.
   • Disable file read functionality if not critical to operations.

4. Monitoring & Detection:

   • Log and alert on suspicious HTTP requests to /encapsulatedDoc.
   • Deploy IDS/IPS (e.g., Snort, Suricata) to detect path traversal attempts.
   • File integrity monitoring (FIM) to detect unauthorized file access.

Long-Term Remediation

1. Secure Coding Practices:

   • Implement strict input validation (reject any input containing ../, ./, or encoded variants).
   • Use secure file handling APIs (e.g., realpath() in C, Path in Python) to resolve canonical paths.
   • Apply the principle of least privilege (ensure the PACS service runs with minimal permissions).

2. Regular Vulnerability Scanning:

   • Conduct penetration testing (e.g., using Burp Suite, OWASP ZAP) to identify similar flaws.
   • Subscribe to vendor security advisories for MedDream PACS.

3. Compliance & Auditing:

   • Ensure HIPAA/GDPR compliance if handling medical data.
   • Conduct a risk assessment to evaluate exposure to similar vulnerabilities.

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5. Impact on the Cybersecurity Landscape

Broader Implications

1. Healthcare Sector Risks:

   • PACS systems are high-value targets for ransomware groups (e.g., Conti, LockBit) and APT actors (e.g., APT29, Lazarus).
   • Medical data breaches can lead to identity theft, insurance fraud, or blackmail.
   • Regulatory fines (HIPAA violations can exceed $1.5M per incident).

2. Supply Chain & Third-Party Risks:

   • Many hospitals use third-party PACS integrations, increasing the attack surface.
   • Vendor dependencies mean a single vulnerability can impact multiple healthcare providers.

3. Exploitation Trends:

   • Increased targeting of medical devices (e.g., MRI machines, X-ray systems) due to weak security controls.
   • Ransomware gangs may exploit this flaw to exfiltrate data before encryption.

4. Zero-Day Market Impact:

   • If unpatched, this vulnerability could be sold on dark web forums or used in targeted attacks.
   • Nation-state actors may leverage it for espionage (e.g., stealing medical research).

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6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerability stems from improper input validation in the encapsulatedDoc endpoint, which:

• Fails to sanitize user-supplied file paths, allowing directory traversal.
• Lacks authentication checks, enabling unauthenticated access.
• May use insecure file handling functions (e.g., fopen() without path normalization).

Exploitation Technical Deep Dive

1. Identifying the Vulnerable Endpoint

• Fuzz testing (e.g., with ffuf, Burp Intruder) can reveal the endpoint:

  ffuf -u http://<target>/FUZZ -w /path/to/wordlist.txt -mr "file not found"
  

• Common endpoint names:
  • /encapsulatedDoc
  • /getDocument
  • /fileDownload

2. Path Traversal Payloads

• Basic traversal:

  GET /encapsulatedDoc?file=../../../../etc/passwd HTTP/1.1
  

• Bypass techniques:
  • URL encoding:

    GET /encapsulatedDoc?file=%2e%2e%2f%2e%2e%2fetc%2fpasswd HTTP/1.1
    

  • Double encoding:

    GET /encapsulatedDoc?file=%252e%252e%252fetc%252fpasswd HTTP/1.1
    

  • Null byte injection (if supported):

    GET /encapsulatedDoc?file=../../../../etc/passwd%00 HTTP/1.1
    

3. Post-Exploitation File Targets

File Path	Potential Impact
/etc/passwd	User enumeration.
/etc/shadow	Password hashes (if accessible).
/var/log/auth.log	SSH login attempts.
/opt/meddream/config.ini	Database credentials.
/var/www/html/config.php	Web app secrets.
/home/*/.ssh/id_rsa	SSH private keys.
/var/lib/mysql/	Database files (if MySQL is used).

4. Automated Exploitation (Metasploit/Exploit-DB)

• If a Metasploit module is released, it may include:
  • File path fuzzing to identify accessible files.
  • Credential harvesting from configuration files.
  • Session token theft from logs.

Detection & Forensics

Indicators of Compromise (IoCs)

• Network-level:
  • Unusual HTTP requests to /encapsulatedDoc with ../ sequences.
  • Large file downloads from the PACS server.
• Host-level:
  • Unexpected file access logs (e.g., /var/log/apache2/access.log).
  • New or modified files in /tmp/ or /var/tmp/.

Forensic Analysis

• Check web server logs for:

  grep -r "encapsulatedDoc" /var/log/apache2/ /var/log/nginx/
  

• Analyze file access timestamps:

  find / -type f -newermt "2026-01-20" -ls 2>/dev/null
  

• Memory forensics (if the attack involved in-memory exploitation):

  volatility -f memory.dump linux_pslist
  

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Conclusion & Recommendations

Key Takeaways

• CVE-2025-53912 is a critical unauthenticated arbitrary file read vulnerability in MedDream PACS Premium 7.3.6.870.
• Exploitation is trivial and can lead to sensitive data exposure, including medical records and credentials.
• Healthcare organizations are at high risk due to the sensitive nature of PACS data and regulatory implications.

Action Plan for Security Teams

1. Patch immediately if a fix is available.
2. Isolate vulnerable systems from untrusted networks.
3. Deploy WAF/IDS rules to detect and block exploitation attempts.
4. Conduct a forensic investigation if compromise is suspected.
5. Monitor for similar vulnerabilities in other medical imaging systems.

Final Thoughts

This vulnerability underscores the critical need for secure coding practices in healthcare software, where patient data confidentiality is paramount. Organizations must prioritize PACS security to prevent data breaches, ransomware attacks, and regulatory penalties.

For further details, refer to the Cisco Talos advisory: 🔗 TALOS-2025-2273