CVE-2019-11687

Description

An issue was discovered in the DICOM Part 10 File Format in the NEMA DICOM Standard 1995 through 2019b and continuing in current implementations. The 128-byte preamble of a DICOM file that complies with this specification can contain arbitrary executable headers for multiple operating systems, including Portable Executable (PE) files for Windows and Executable and Linkable Format (ELF) files for Linux-based systems. This space is left unspecified so that dual-purpose files can be created. For example, dual-purpose TIFF/DICOM files are used in digital whole slide imaging applications in medicine. This design flaw enables system-wide compromise as malicious DICOM files are routinely shared between medical devices and hospital systems and transported via removable media for patient care coordination. To exploit this vulnerability, someone must execute the maliciously crafted file. These files can be executable even with the .dcm file extension. Anti-malware configurations at healthcare facilities often ignore medical imagery. DICOM files exist on systems that process protected health information, and successful exploitation could result in violations of regulatory compliance requirements such as HIPAA and FDA postmarket obligations.

Gravité et risque d'exploitation

CVE-2019-11687 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 2.76 %, ce qui la place devant 86.1 % des CVE référencées.

Que faire ?

• Vérifiez si le produit concerné est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://labs.cylera.com/2019.04.16/pe-dicom-medical-malware
• https://github.com/d00rt/pedicom/blob/master/doc/Attacking_Digital_Imaging_and_Communication_in_Medicine_%28DICOM%29_file_format_standard_-_Markel_Picado_Ortiz_%28d00rt%29.pdf
• https://github.com/d00rt/pedicom
• http://www.securityfocus.com/bid/108730
• https://www.praetorian.com/blog/elfdicom-poc-malware-polyglot-exploiting-linux-based-medical-devices/