CVE-2018-1890 in SDK Java Technology Edition
Summary
by MITRE
IBM SDK, Java Technology Edition Version 8 on the AIX platform uses absolute RPATHs which may facilitate code injection and privilege elevation by local users. IBM X-Force ID: 152081.
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Analysis
by VulDB Data Team • 07/31/2023
The vulnerability identified as CVE-2018-1890 affects IBM SDK, Java Technology Edition Version 8 when running on the AIX operating system platform. This issue stems from the use of absolute RPATHs within the Java runtime environment, creating a significant security risk for systems utilizing this particular software configuration. The flaw represents a classic path injection vulnerability that can be exploited by local attackers to gain elevated privileges and execute arbitrary code within the system context.
The technical implementation of this vulnerability involves the Java runtime environment being compiled with absolute RPATH values that point to specific directories on the filesystem. When the Java application loads shared libraries, it follows these hardcoded paths without proper validation or sanitization of the library search order. This design flaw allows an attacker with local access to manipulate the library loading process by placing malicious shared objects in the specified absolute paths, effectively bypassing normal security controls and privilege boundaries. The vulnerability directly maps to CWE-428, which describes improper use of absolute paths in library loading mechanisms, and aligns with ATT&CK technique T1068, which covers the exploitation of legitimate credentials for privilege escalation.
The operational impact of this vulnerability is substantial for organizations running IBM SDK Java applications on AIX systems. Local users who can write to directories referenced in the absolute RPATH can inject malicious code that will be executed with the privileges of the Java process, potentially leading to complete system compromise. The attack vector is particularly dangerous because it requires minimal privileges to exploit - only local access to the system is needed. Once successfully exploited, attackers can elevate their privileges to match those of the Java runtime process, which may have elevated system permissions depending on how the application was configured and deployed. This vulnerability affects the fundamental security model of the Java runtime environment and could allow for persistent backdoor access to the compromised systems.
Mitigation strategies for CVE-2018-1890 should focus on immediate patching of the affected IBM SDK Java installations to address the absolute RPATH implementation. Organizations should also implement additional security controls such as restricting write permissions to directories referenced in system library paths, implementing proper file system permissions, and monitoring for unauthorized modifications to critical system directories. The solution should include regular security audits of library loading mechanisms and consideration of using relative paths or proper dynamic library resolution techniques that do not rely on hardcoded absolute paths. System administrators should also consider implementing process monitoring to detect suspicious library loading activities and maintain comprehensive logging of system changes to identify potential exploitation attempts. Additionally, organizations should review their overall security posture and ensure that local user access controls are properly enforced to limit the potential impact of such vulnerabilities.