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AUSCERT External Security Bulletin Redistribution
ESB-2022.3081
Advisory (icsma-22-174-01) OFFIS DCMTK
24 June 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: OFFIS DCMTK
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-2121 CVE-2022-2120 CVE-2022-2119
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsma-22-174-01
Comment: CVSS (Max): 7.5 CVE-2022-2120 (CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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ICS Medical Advisory (ICSMA-22-174-01)
OFFIS DCMTK
Original release date: June 23, 2022
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable from an adjacent network/low attack complexity
o Vendor: OFFIS
o Equipment: DCMTK
o Vulnerabilities: Path Traversal, Relative Path Traversal, NULL Pointer
Dereference
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
cause a denial-of-service condition, write malformed DICOM files into arbitrary
directories, and gain remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of DCMTK, libraries and software that process DICOM
image files, are affected:
o DCMTK: All versions prior to 3.6.7
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
TRAVERSAL') CWE-22
The affected product's service class provider (SCP) is vulnerable to path
traversal, allowing an attacker to write DICOM files into arbitrary directories
under controlled names. This could allow remote code execution.
CVE-2022-2119 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:A/AC:H/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.2 RELATIVE PATH TRAVERSAL CWE-23
The affected product's service class user (SCU) is vulnerable to relative path
traversal, allowing an attacker to write DICOM files into arbitrary directories
under controlled names. This could allow remote code execution.
CVE-2022-2120 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:A/AC:H/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.3 NULL POINTER DEREFERENCE CWE-476
The affected product has a NULL pointer dereference vulnerability while
processing DICOM files, which may result in a denial-of-service condition.
CVE-2022-2121 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Noam Moshe of Claroty reported these vulnerabilities to CISA.
4. MITIGATIONS
OFFIS recommends all users update to Version 3.6.7 or later. For more
information see Bug #1021
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on cisa.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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