CVE-2008-5356 in SDKJDK
Summary
by MITRE
Heap-based buffer overflow in Java Runtime Environment (JRE) for 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 might allow remote attackers to execute arbitrary code via a crafted TrueType font file.
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Analysis
by VulDB Data Team • 08/21/2019
The vulnerability identified as CVE-2008-5356 represents a critical heap-based buffer overflow within the Java Runtime Environment that affects multiple versions of the Sun JDK and JRE across different release lines. This flaw resides in the handling of TrueType font files, which are commonly used for text rendering in graphical applications and operating systems. The vulnerability specifically impacts Java versions up to and including JDK/JRE 6 Update 10, JDK/JRE 5.0 Update 16, and SDK/JRE 1.4.2_18, making it a long-standing issue that affected a substantial portion of Java deployments in 2008. The security implications are severe as the flaw can be exploited remotely through maliciously crafted font files, potentially allowing attackers to execute arbitrary code on vulnerable systems.
The technical implementation of this vulnerability stems from inadequate bounds checking during the parsing of TrueType font format structures within the Java runtime environment. When the JRE processes a specially crafted TrueType font file, the buffer overflow occurs in heap memory allocation routines responsible for handling font data. The flaw manifests when the application attempts to write data beyond the allocated buffer boundaries, leading to memory corruption that can be leveraged by attackers to overwrite critical memory locations. This type of vulnerability is classified as a CWE-121 heap-based buffer overflow, which directly relates to improper handling of memory allocation and data boundaries in the software implementation. The attack vector is particularly dangerous as it requires no user interaction beyond the mere presence of the malicious font file, making it an ideal candidate for automated exploitation.
The operational impact of CVE-2008-5356 extends far beyond simple code execution, as it provides attackers with potential full system compromise capabilities. In a typical exploitation scenario, an attacker could craft a malicious TrueType font file that, when processed by a vulnerable Java application, would trigger the buffer overflow and allow arbitrary code execution with the privileges of the affected Java process. This could lead to complete system compromise, especially if the Java application runs with elevated privileges or is used in server environments. The vulnerability's remote exploitation capability makes it particularly dangerous in web environments where users might unknowingly download and process malicious font files through web browsers or other Java-enabled applications. According to ATT&CK framework, this vulnerability maps to T1059.007 for command and scripting interpreter and T1203 for exploitation for client execution, as it enables attackers to execute code on the target system through legitimate Java runtime processes.
Mitigation strategies for CVE-2008-5356 require immediate patching of affected Java installations to the latest available versions that contain the necessary security fixes. Organizations should implement comprehensive patch management procedures to ensure all Java runtime environments are updated promptly, particularly in server and enterprise environments where the risk of exploitation is highest. Additional protective measures include implementing strict file validation policies that prevent execution of untrusted font files, disabling Java plugin execution in web browsers, and deploying network-based intrusion detection systems to monitor for exploitation attempts. The vulnerability serves as a prime example of why proper input validation and memory safety practices are essential in software development, as the flaw could have been prevented through proper bounds checking and secure coding practices during the development lifecycle. Organizations should also consider implementing application whitelisting policies that restrict which applications can execute font processing routines, thereby reducing the attack surface for this and similar vulnerabilities.