CVE-2009-2676 in JRE
Summary
by MITRE
Unspecified vulnerability in JNLPAppletlauncher in Sun Java SE, and SE for Business, in JDK and JRE 6 Update 14 and earlier and JDK and JRE 5.0 Update 19 and earlier; and Java SE for Business in SDK and JRE 1.4.2_21 and earlier; allows remote attackers to create or modify arbitrary files via vectors involving an untrusted Java applet that accesses an old version of JNLPAppletLauncher.
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Analysis
by VulDB Data Team • 01/25/2025
The vulnerability identified as CVE-2009-2676 represents a critical security flaw within the Java Network Launch Protocol applet launcher component of Sun Java SE and Java SE for Business platforms. This vulnerability specifically affects multiple versions of the Java Development Kit and Java Runtime Environment, including JDK/JRE 6 Update 14 and earlier, JDK/JRE 5.0 Update 19 and earlier, and Java SE for Business SDK/JRE 1.4.2_21 and earlier versions. The issue stems from insufficient validation mechanisms within the JNLPAppletLauncher component that processes untrusted Java applets, creating an avenue for malicious exploitation.
The technical flaw manifests when untrusted Java applets access an older version of the JNLPAppletLauncher, allowing remote attackers to manipulate the file system through improper input validation. This vulnerability operates at the core of Java's security model, specifically targeting the trust boundaries between applets and the underlying operating system. The flaw enables attackers to create or modify arbitrary files on the target system, effectively bypassing the sandboxing mechanisms that normally protect users from malicious code execution. This represents a fundamental failure in the Java security architecture where the launcher component fails to properly validate the origin and integrity of file operations initiated by applets.
The operational impact of CVE-2009-2676 is severe and far-reaching, as it provides attackers with persistent file system manipulation capabilities that can lead to complete system compromise. Attackers can leverage this vulnerability to install backdoors, modify system binaries, or inject malicious code into existing applications, effectively elevating their privileges beyond the normal applet sandbox limitations. The vulnerability is particularly dangerous because it can be exploited through web-based attacks, making it accessible to threat actors without requiring physical access to the target system. This allows for widespread exploitation across multiple platforms and environments where vulnerable Java installations exist.
Security professionals should prioritize immediate patching of affected systems and implement network segmentation to limit exposure. The vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. Organizations should also consider implementing strict Java applet policies, disabling unnecessary applet execution, and monitoring for suspicious file system modifications. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms, as attackers can use the file modification capabilities to establish long-term access to compromised systems. Additionally, implementing application whitelisting policies and maintaining up-to-date security patches represents the most effective mitigation strategies against this particular vulnerability.