Oracle Java Runtime Environment (JRE) contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.
The vulnerability is due to insufficient access controls implemented by the affected software when setting final fields on static classes while invoking the reflection application programming interface (API). An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a crafted website that contains a malicious Java applet. Successful exploitation could allow the attacker to bypass Java sandbox protections and execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
Functional code that exploits this vulnerability is publicly available as part of the Metasploit framework.
Oracle has confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Oracle Java Development Kit (JDK) and JRE versions 7 Update 17 and prior are vulnerable.
The vulnerability in the Hotspot component of the affected software is due to insufficient access controls used by the affected software when setting final fields on static classes while invoking the reflection API.
An unauthenticated, remote attacker could exploit this vulnerability by using misleading language or instructions to persuade a user to visit a website that contains a crafted Java applet and convincing the user to accept the Java security warning and run the malicious applet. When the software processes the malicious applet, a Type Confusion could occur. A successful exploit could allow the attacker to use the Type Confusion to bypass Java sandbox protections and execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link, accept the Java security warning, and run the malicious applet.
Reports indicate that this vulnerability is being actively exploited in the wild.
Administrators are advised to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.
Administrators are advised to use an unprivileged account for routine activities.
Administrators are advised to monitor affected systems.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.