CVE-2012-1541 in Java
Summary
by MITRE
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 through Update 11 and 6 through Update 38 allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors related to Deployment, a different vulnerability than other CVEs listed in the February 2013 CPU. NOTE: the previous information is from the February 2013 CPU. Oracle has not commented on claims from a third party that the issue is due to an interaction error in between the JRE plug-in for WebKit-based browsers and the Javascript engine, which allows remote attackers to execute arbitrary code by modifying DOM nodes that contain applet elements in a way that triggers an incorrect reference count and a use after free.
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Analysis
by VulDB Data Team • 12/08/2024
The vulnerability identified as CVE-2012-1541 represents a critical security flaw within Oracle's Java Runtime Environment that affects multiple versions of Java SE including Java 7 through Update 11 and Java 6 through Update 38. This issue falls under the category of unspecified vulnerability within the Deployment component of the JRE, making it particularly challenging to assess and mitigate due to the lack of specific technical details in the initial disclosure. The vulnerability's classification as affecting confidentiality, integrity, and availability demonstrates its potential to cause widespread impact across different security dimensions. Security researchers have noted that this vulnerability differs from other issues addressed in the February 2013 Critical Patch Update, indicating it operates through distinct attack vectors that require separate mitigation strategies.
The technical nature of this vulnerability appears to stem from an interaction error between the JRE plug-in designed for WebKit-based browsers and the JavaScript engine within those browsers. This cross-component interaction creates a complex attack surface where malicious actors can exploit the integration between Java applets and web browser rendering engines. The specific mechanism involves manipulation of Document Object Model nodes that contain applet elements, which triggers an incorrect reference counting mechanism within the Java runtime environment. This faulty reference counting leads to a use-after-free condition, where memory that has been deallocated is still being accessed by the application. Such conditions are particularly dangerous because they can be exploited to execute arbitrary code on the victim's system, bypassing normal security restrictions and potentially allowing full system compromise.
From an operational impact perspective, this vulnerability represents a significant threat to enterprise security environments where Java applets are commonly used for web-based applications and business processes. The use-after-free condition creates a potential for remote code execution, which means attackers can remotely compromise systems without requiring local access or user interaction beyond visiting a malicious website. The vulnerability affects both older Java 6 versions and newer Java 7 implementations, indicating a broad attack surface that spans multiple generations of the Java platform. Organizations running Java-based web applications are particularly at risk since the exploitation can occur through standard web browsing activities, making detection and prevention challenging. This vulnerability directly relates to CWE-476 which describes NULL pointer dereference conditions, and more specifically connects to CWE-122 which covers heap-based buffer overflow conditions that can result from improper memory management.
The attack methodology for exploiting this vulnerability involves carefully crafted web content that manipulates DOM nodes containing applet elements in a manner that triggers the incorrect reference count behavior. When the JavaScript engine processes these manipulated elements, it causes the JRE plugin to improperly manage memory references, leading to a use-after-free condition. This condition can be leveraged to inject and execute malicious code with the privileges of the user running the affected browser. The exploit requires no special user interaction beyond visiting a compromised website, making it particularly dangerous in phishing campaigns or when users browse untrusted web content. Security practitioners should note that this vulnerability aligns with ATT&CK technique T1059 which describes the use of scripting languages for execution, and T1203 which involves the use of web-based attacks to gain initial access to systems.
Mitigation strategies for CVE-2012-1541 should prioritize immediate patching of affected Java installations, as Oracle has released updates to address this vulnerability. Organizations should disable Java plugin functionality in web browsers when it is not required for business operations, as this significantly reduces the attack surface. Network-level controls such as firewall rules that block access to Java applet content and web applications that do not require Java functionality can provide additional protection. Security teams should implement monitoring for suspicious JavaScript behavior and memory access patterns that might indicate exploitation attempts. Regular security assessments should verify that all Java installations are properly updated and that unnecessary Java components are removed from systems. System administrators should also consider implementing application whitelisting policies that restrict which Java-based applications can execute on enterprise systems. The vulnerability's nature makes it particularly important to maintain up-to-date security patches and to conduct regular vulnerability assessments to identify and remediate similar issues before they can be exploited by malicious actors.