CVE-2012-0505 in JRE
Summary
by MITRE
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 2 and earlier, 6 Update 30 and earlier, 5 Update 33 and earlier, and 1.4.2_35 and earlier allows remote untrusted Java Web Start applications and untrusted Java applets to affect confidentiality, integrity, and availability via unknown vectors related to Serialization.
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Analysis
by VulDB Data Team • 11/30/2021
The vulnerability identified as CVE-2012-0505 represents a critical security flaw within Oracle's Java Runtime Environment that affects multiple versions of Java SE including Java 7 Update 2 and earlier, Java 6 Update 30 and earlier, Java 5 Update 33 and earlier, and Java 1.4.2_35 and earlier. This issue specifically targets the serialization mechanism within the JRE component, which serves as a fundamental data exchange protocol for Java applications. The vulnerability's classification as unspecified indicates that the exact technical details of the flaw were not fully disclosed in the initial advisory, though the impact was clearly defined as affecting confidentiality, integrity, and availability aspects of the system. This type of vulnerability is particularly dangerous because serialization is a core feature used extensively in Java applications for object persistence and network communication.
The technical flaw resides in how the Java Runtime Environment handles serialized objects during the deserialization process, particularly when processing untrusted input from Java Web Start applications or applets. When an untrusted Java application attempts to deserialize data, the JRE's serialization mechanism fails to properly validate or sanitize the incoming data structure, creating potential attack vectors that could be exploited by malicious actors. This weakness allows attackers to craft specially malformed serialized objects that, when processed by the vulnerable JRE, could trigger unexpected behavior. The vulnerability's relationship to serialization aligns with common CWE classifications such as CWE-502 which deals with deserialization of untrusted data, and CWE-121 which addresses stack-based buffer overflow conditions. The attack surface is significantly expanded through Java Web Start applications that can execute code in the user's security context without proper sandboxing, making this a particularly attractive target for exploitation.
The operational impact of CVE-2012-0505 extends far beyond simple data corruption or system instability, as it can potentially enable complete system compromise when exploited. Attackers could leverage this vulnerability to execute arbitrary code on vulnerable systems, potentially gaining unauthorized access to sensitive data, modifying system configurations, or disrupting service availability. The confidentiality aspect is compromised through potential data exfiltration or unauthorized access to protected information, while integrity is threatened through code injection or data manipulation attacks. Availability is at risk when attackers can cause denial of service conditions through carefully crafted serialized objects that trigger resource exhaustion or system crashes. The widespread adoption of Java across enterprise environments makes this vulnerability particularly dangerous, as it affects not just individual systems but entire networks of interconnected applications. This vulnerability directly maps to ATT&CK technique T1059.007 which covers the use of Java for command and control operations, and T1203 which addresses exploitation of remote services through serialized data manipulation.
Mitigation strategies for CVE-2012-0505 should prioritize immediate patching of all affected Java installations to the latest available versions, as Oracle has released security updates addressing this specific vulnerability. Organizations should implement network segmentation and firewall rules to restrict access to Java Web Start applications and applet execution where possible, particularly in high-security environments. The principle of least privilege should be enforced by running Java applications with minimal required permissions and avoiding execution of untrusted code from external sources. Additional protective measures include implementing application whitelisting policies that only allow execution of known good Java applications, regularly monitoring for suspicious network traffic related to Java serialization, and conducting thorough security assessments of Java-based applications to identify potential exploitation vectors. System administrators should also consider disabling Java applet support entirely in web browsers and implementing content security policies to prevent execution of untrusted Java content in web environments. Regular vulnerability scanning and penetration testing should be conducted to identify any remaining vulnerable systems and ensure that all Java installations remain properly patched against this and similar serialization-related vulnerabilities.