CVE-2018-1437 in Notes
Summary
by MITRE
IBM Notes 8.5 and 9.0 could allow an attacker to execute arbitrary code on the system, caused by an error related to multiple untrusted search path. A local attacker could exploit this vulnerability to DLL hijacking to execute arbitrary code on the system or cause the application to crash. IBM X-Force ID: 139565.
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Analysis
by VulDB Data Team • 02/21/2023
This vulnerability in IBM Notes versions 8.5 and 9.0 represents a critical security flaw that enables arbitrary code execution through improper handling of untrusted search paths. The vulnerability stems from the application's failure to properly validate and sanitize the search paths used when loading dynamic link libraries, creating opportunities for malicious code injection. This issue specifically manifests as a DLL hijacking vulnerability that can be exploited by local attackers who have access to the system. The flaw is categorized under CWE-426 which addresses Untrusted Search Path vulnerabilities, where applications search for libraries in potentially unsafe locations. The vulnerability allows attackers to place malicious DLL files in directories that are searched before legitimate system directories, enabling code execution with the privileges of the Notes application. This represents a significant concern for enterprise environments where IBM Notes is widely deployed, as the attack vector requires only local system access rather than network-based exploitation.
The technical exploitation of this vulnerability occurs when IBM Notes attempts to load dynamic libraries without proper path validation mechanisms. When the application searches for required DLL files, it traverses a predefined search path that includes user-writable directories, allowing attackers to place malicious libraries that will be loaded in preference to legitimate ones. This behavior creates a classic DLL hijacking scenario where the attacker can execute arbitrary code with the privileges of the Notes process. The impact extends beyond simple code execution to potentially allow privilege escalation if the Notes application runs with elevated permissions. The vulnerability can also cause application instability leading to crashes or denial of service conditions. According to ATT&CK framework, this maps to T1059.001 for Command and Scripting Interpreter and T1068 for Exploitation for Privilege Escalation, demonstrating how the initial access through DLL hijacking can lead to broader system compromise. The IBM X-Force ID 139565 confirms the severity and provides additional context for threat actors who may be actively targeting this vulnerability.
Organizations utilizing IBM Notes 8.5 and 9.0 should implement immediate mitigations to address this vulnerability. The primary recommendation involves updating to patched versions of IBM Notes where the untrusted search path issues have been resolved through proper path validation and library loading mechanisms. System administrators should also implement strict file system permissions to prevent unauthorized users from writing to directories in the application search paths. Additional mitigations include enabling Windows Defender Application Control or similar application whitelisting solutions to restrict which DLLs can be loaded by Notes applications. Network segmentation and principle of least privilege should be enforced to limit local access to systems running IBM Notes. Security monitoring should be enhanced to detect suspicious file creation patterns in system directories and unusual library loading activities. Organizations should also conduct vulnerability assessments to identify systems running affected versions and ensure proper patch management procedures are in place. The vulnerability highlights the importance of secure coding practices and proper input validation, particularly when dealing with dynamic library loading operations that are common in enterprise applications. Regular security audits and penetration testing should include assessment of search path configurations to prevent similar vulnerabilities from being introduced in future software deployments.