CVE-2000-1099 in JDK
Summary
by MITRE
Java Runtime Environment in Java Development Kit (JDK) 1.2.2_05 and earlier can allow an untrusted Java class to call into a disallowed class, which could allow an attacker to escape the Java sandbox and conduct unauthorized activities.
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Analysis
by VulDB Data Team • 09/05/2019
The vulnerability identified as CVE-2000-1099 represents a critical sandbox escape flaw within the Java Runtime Environment that affected JDK versions 1.2.2_05 and earlier. This security weakness stems from improper class loading mechanisms that fail to adequately enforce the security boundaries between trusted and untrusted code execution environments. The vulnerability specifically targets the Java sandbox model which is designed to prevent untrusted applets and applications from accessing sensitive system resources or executing privileged operations.
The technical flaw manifests through a class loading bypass mechanism where untrusted Java classes can inadvertently gain access to disallowed system classes through improper access control checks. This occurs when the Java Virtual Machine fails to properly validate class access permissions during the loading process, allowing malicious code to leverage legitimate system classes for unauthorized operations. The vulnerability operates at the core of Java's security architecture, specifically targeting the class loader hierarchy and security manager implementation that should prevent such cross-boundary access.
From an operational impact perspective, this vulnerability enables attackers to completely bypass the Java sandbox protection model, potentially allowing them to execute arbitrary code with system-level privileges. An attacker could exploit this weakness to access local files, establish network connections, execute system commands, or perform other malicious activities that should normally be restricted within the sandboxed environment. The implications extend beyond simple privilege escalation as this flaw fundamentally undermines the security assumptions upon which Java applet security relies, potentially enabling full system compromise when exploited in web browser contexts.
The vulnerability aligns with CWE-254 and CWE-255 categories, specifically addressing weaknesses in security models and access control mechanisms within the Java platform. According to ATT&CK framework, this vulnerability maps to T1059 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation) techniques, as it allows attackers to execute arbitrary commands and escalate privileges through the Java security bypass. Organizations running affected JDK versions face significant risk when hosting untrusted Java content, particularly in web environments where applets are commonly executed.
Mitigation strategies for CVE-2000-1099 require immediate patching of affected JDK installations to version 1.2.2_06 or later, which contains the necessary security fixes for the class loading bypass mechanism. System administrators should also implement network-level restrictions to limit Java applet execution where possible, disable unnecessary Java functionality in web browsers, and conduct thorough security audits of existing Java applications. Additionally, organizations should consider implementing application whitelisting policies and monitoring for suspicious Java-related network activity to detect potential exploitation attempts. The vulnerability underscores the critical importance of maintaining up-to-date security patches and proper security architecture design in preventing sandbox escape attacks.