CVE-2018-5457 in Medical CareFusion Upgrade Utility
Summary
by MITRE
A uncontrolled search path element issue was discovered in Vyaire Medical CareFusion Upgrade Utility used with Windows XP systems, Versions 2.0.2.2 and prior versions. A successful exploit of this vulnerability requires the local user to install a crafted DLL on the target machine. The application loads the DLL and gives the attacker access at the same privilege level as the application.
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Analysis
by VulDB Data Team • 02/02/2021
The vulnerability identified as CVE-2018-5457 represents a critical uncontrolled search path element issue within the Vyaire Medical CareFusion Upgrade Utility, specifically affecting Windows XP systems running versions 2.0.2.2 and earlier. This flaw falls under the category of insecure library loading practices that have been consistently flagged in cybersecurity frameworks as dangerous programming errors. The vulnerability is classified as CWE-427, which specifically addresses uncontrolled search path elements, and aligns with ATT&CK technique T1059.001 for execution through command and scripting interpreter. The issue stems from the application's failure to properly validate or sanitize the search path used when loading dynamic link libraries, creating a potential attack vector that adversaries can exploit through local privilege escalation.
The technical implementation of this vulnerability relies on a fundamental flaw in how the CareFusion Upgrade Utility handles dynamic library loading on Windows systems. When the application executes, it searches for required DLL files using a predictable search order that includes the current working directory before system directories. This design flaw allows a local attacker to place a maliciously crafted DLL file in a location that will be searched before legitimate system libraries. The vulnerability requires local user access to install the malicious DLL, making it a local privilege escalation vector rather than a remote attack. However, the impact is significant as the malicious DLL executes with the same privileges as the legitimate application, potentially allowing attackers to escalate their access level and perform actions such as privilege escalation, data manipulation, or system compromise.
The operational impact of CVE-2018-5457 extends beyond simple privilege escalation, as it represents a serious security weakness in medical device software that could potentially affect patient care systems. Medical devices running vulnerable versions of this upgrade utility may be susceptible to attackers who gain local access through social engineering, physical access, or other initial compromise vectors. The vulnerability's exploitation requires the attacker to have local access to the system, which is particularly concerning in healthcare environments where physical security may be less stringent than in enterprise settings. The fact that this issue affects Windows XP systems, which are no longer supported by Microsoft, compounds the risk as these systems lack security updates and modern protection mechanisms. Organizations running affected systems should consider the broader implications of this vulnerability within their medical device ecosystems, as the compromised upgrade utility could serve as a foothold for more extensive attacks.
Mitigation strategies for CVE-2018-5457 should focus on immediate remediation through software updates and patch management. The primary solution involves upgrading to a version of the Vyaire Medical CareFusion Upgrade Utility that addresses the uncontrolled search path issue. Organizations should also implement additional protective measures such as restricting local user privileges, monitoring for suspicious DLL loading activities, and implementing application whitelisting policies. The vulnerability's nature makes it susceptible to detection through behavioral monitoring, as anomalous DLL loading patterns would indicate potential exploitation attempts. System administrators should also consider implementing security controls that prevent local users from placing files in directories that are part of the application's search path. Given the age of the affected systems and the end-of-life status of Windows XP, organizations should prioritize migrating away from these legacy systems to ensure continued security support and protection against similar vulnerabilities. The vulnerability demonstrates the importance of secure coding practices and proper library loading mechanisms, particularly in critical infrastructure applications where security failures can have serious consequences.