CVE-2016-0603 in Java SE
Summary
by MITRE
Unspecified vulnerability in the Java SE component in Oracle Java SE 6u111, 7u95, 8u71, and 8u72, when running on Windows, allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors related to Install. NOTE: the previous information is from Oracle's Security Alert for CVE-2016-0603. Oracle has not commented on third-party claims that this is an untrusted search path issue that allows local users to gain privileges via a Trojan horse dll in the "application directory."
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Analysis
by VulDB Data Team • 08/21/2018
The vulnerability identified as CVE-2016-0603 affects Oracle Java SE versions 6u111, 7u95, 8u71, and 8u72 when operating on Windows systems. This issue resides within the Java installation process and represents a significant security weakness that can be exploited by remote attackers to compromise system integrity and availability. The vulnerability's classification as unspecified in Oracle's initial description suggests that the exact technical mechanism remains partially obscured, though subsequent analysis has identified it as related to an untrusted search path problem during installation operations.
The technical flaw manifests through an insecure installation mechanism that fails to properly validate or sanitize the search paths used during Java component deployment. When Java installs or updates components on Windows systems, it may inadvertently incorporate malicious dynamic link libraries from the application directory, creating a privilege escalation vector. This weakness directly maps to CWE-427 Uncontrolled Search Path Element, which describes how applications that use untrusted search paths can be manipulated by attackers to load malicious code. The vulnerability exploits the trust model inherent in Windows installation processes where the system may automatically execute code from directories in the PATH environment variable without proper validation.
The operational impact of CVE-2016-0603 extends beyond simple confidentiality breaches, as it can simultaneously compromise integrity and availability of affected systems. Remote attackers leveraging this vulnerability can potentially execute arbitrary code with elevated privileges, effectively bypassing standard security controls. Local users can exploit this weakness through a Trojan horse DLL attack, where malicious code is placed in the application directory and executed during legitimate Java installation processes. This vector represents a sophisticated attack method that aligns with ATT&CK technique T1059 Command and Scripting Interpreter, specifically targeting installation processes to establish persistent access. The vulnerability affects not only individual user systems but also enterprise environments where Java installations are widespread.
Mitigation strategies for CVE-2016-0603 require immediate patching of affected Java versions to the latest security updates provided by Oracle. Organizations should implement strict access controls and privilege separation during Java installation processes, ensuring that only authorized personnel can perform system modifications. System administrators should monitor and audit installation directories for unauthorized DLL placements, implementing file integrity monitoring solutions to detect anomalous activity. Additionally, the principle of least privilege should be enforced by restricting write permissions to Java installation directories and ensuring that the application directory is not included in the system PATH. Network segmentation and firewall rules can help limit the attack surface by restricting access to Java installation services. The vulnerability demonstrates the critical importance of secure installation practices and proper privilege management, as highlighted in industry security frameworks that emphasize the need for secure coding practices and comprehensive vulnerability management programs.