CVE-2008-5344 in SDKJDK
Summary
by MITRE
Unspecified vulnerability in Java Web Start (JWS) and Java Plug-in with Sun JDK and JRE 6 Update 10 and earlier; JDK and JRE 5.0 Update 16 and earlier; and SDK and JRE 1.4.2_18 and earlier allows untrusted applets to read arbitrary files and make unauthorized network connections via unknown vectors related to applet classloading, aka 6716217.
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Analysis
by VulDB Data Team • 08/03/2021
The vulnerability identified as CVE-2008-5344 represents a critical security flaw affecting Java Web Start and Java Plug-in implementations across multiple Java runtime versions. This issue stems from inadequate security boundaries within the applet classloading mechanism, creating a pathway for untrusted code to bypass normal security restrictions. The vulnerability affects Sun JDK and JRE versions 6 Update 10 and earlier, JDK and JRE 5.0 Update 16 and earlier, as well as SDK and JRE 1.4.2_18 and earlier, indicating a long-standing issue that impacted multiple generations of Java runtime environments. The flaw manifests through unspecified vectors related to applet classloading processes, allowing malicious or compromised applets to execute unauthorized operations that should normally be restricted by the Java security model.
The technical exploitation of this vulnerability enables untrusted applets to perform two primary malicious activities that represent significant security breaches. First, the vulnerability allows these applets to read arbitrary files from the local filesystem, potentially exposing sensitive data, configuration files, or system information that should remain protected from web-based code execution. Second, the flaw permits unauthorized network connections, enabling malicious code to establish communication with external servers or access network resources without proper authorization. These capabilities directly violate fundamental Java security principles that isolate applet execution environments from local system resources and network access. The vulnerability operates at the classloading level, suggesting that the issue occurs during the process of loading and initializing Java classes, where proper security checks fail to validate the trust level or origin of loaded components.
The operational impact of CVE-2008-5344 extends far beyond simple data exposure, as it fundamentally compromises the security model that Java Applets were designed to protect against. Attackers could leverage this vulnerability to access sensitive system information, potentially exfiltrate data, or establish persistent connections to command and control servers. The ability to read arbitrary files creates opportunities for information disclosure attacks, where attackers might access system configuration files, user credentials, or other sensitive data stored locally. The unauthorized network connection capability transforms this vulnerability into a potential vector for remote code execution or data exfiltration, making it particularly dangerous in enterprise environments where Java applets might be executed on systems with elevated privileges. This vulnerability represents a complete breakdown of the security sandbox that Java Applets rely upon, as defined in the Java security architecture documented in the Java Security Model specification.
Mitigation strategies for CVE-2008-5344 require immediate action to address the underlying security flaws in affected Java implementations. Organizations should prioritize updating to patched versions of Java JDK and JRE, specifically versions that address the applet classloading security issues identified in this vulnerability. The recommended approach involves applying the security patches released by Sun Microsystems that correct the classloading mechanisms and restore proper security boundaries between trusted and untrusted code execution. System administrators should also implement network-level restrictions to limit outbound connections from systems running affected Java versions, while disabling Java applet execution in web browsers where possible. Additionally, organizations should conduct thorough security assessments to identify and remove any outdated Java installations that might still be present on systems, as these could continue to pose risks even when newer versions are installed. The vulnerability aligns with CWE-264, which addresses permissions, privileges, and access control issues, and represents a clear violation of the principle of least privilege in Java security implementations. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and defense evasion, as it allows attackers to bypass security restrictions and access system resources that should remain protected.