CVE-2009-3864 in JRE
Summary
by MITRE
The Java Update functionality in Java Runtime Environment (JRE) in Sun Java SE in JDK and JRE 5.0 before Update 22 and JDK and JRE 6 before Update 17, when a non-English version of Windows is used, does not retrieve available new JRE versions, which allows remote attackers to leverage vulnerabilities in older releases of this software, aka Bug Id 6869694.
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Analysis
by VulDB Data Team • 08/27/2021
The vulnerability described in CVE-2009-3864 represents a critical flaw in the Java Runtime Environment update mechanism that specifically affects systems running non-English versions of Microsoft Windows. This issue stems from a fundamental design oversight in how the Java Update functionality handles version retrieval when operating in internationalized environments. The vulnerability affects Sun Java SE implementations across both JDK and JRE versions 5.0 before Update 22 and JDK and JRE 6 before Update 17, creating a window of opportunity for attackers to exploit known vulnerabilities in older Java versions. The flaw manifests when the update process fails to properly query available JRE versions on systems where the operating system locale is set to a non-English language, effectively bypassing the intended update mechanism.
The technical root cause of this vulnerability lies in the improper handling of locale-specific string parsing within the Java update client. When the system locale is set to a non-English language, the update mechanism fails to correctly interpret the version information returned by the update servers, resulting in a failure to detect or retrieve newer JRE versions. This creates a persistent state where users remain on outdated versions of the Java Runtime Environment that contain known security vulnerabilities. The vulnerability operates at the application level and can be classified under CWE-200, which deals with information exposure, as it allows attackers to maintain systems in vulnerable states. The issue specifically impacts the update and patch management process, creating a denial of service condition from a security perspective where the system fails to maintain its security posture.
The operational impact of CVE-2009-3864 is significant as it effectively neutralizes the security benefits of Java's automatic update functionality for users on non-English Windows systems. Attackers can exploit this vulnerability by targeting systems that remain on older Java versions, knowing that these systems will not receive updates through the normal channels. This creates a persistent security risk where organizations may unknowingly maintain vulnerable Java installations on their networks, particularly in enterprise environments where internationalization is common. The vulnerability also has implications for the broader security ecosystem as it demonstrates how localization issues can create security gaps in update mechanisms. From an attacker's perspective, this represents a low-effort vector for maintaining persistent access to vulnerable systems, as the update process fails silently without alerting users or administrators to the presence of outdated software.
The vulnerability's classification under ATT&CK framework would fall under T1068, which deals with Exploitation for Privilege Escalation, and potentially T1595, which covers reconnaissance for vulnerabilities. Organizations affected by this vulnerability should implement immediate mitigations including mandatory patching of all Java installations, regardless of language locale, and the implementation of network monitoring to detect exploitation attempts. The recommended approach involves disabling automatic Java updates on affected systems and manually implementing update procedures, along with regular security assessments to identify systems that may be affected. Additionally, network segmentation and application whitelisting can help reduce the attack surface while patches are deployed. Organizations should also consider implementing endpoint detection and response solutions that can monitor for suspicious Java-related activities, as the vulnerability may be leveraged as part of broader attack campaigns targeting known Java vulnerabilities in older versions. The incident highlights the importance of comprehensive testing across internationalized environments and demonstrates how seemingly minor localization issues can create significant security vulnerabilities in update mechanisms.