A vulnerability in the Oracle Java Runtime Environment (JRE) could allow an unauthenticated, remote attacker to bypass security restrictions.
The vulnerability is due to improper checks while handling parameters in applets. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a website that is designed to provide a malicious applet. A successful exploit could allow the attacker to bypass security restrictions and run applets on the targeted system without user knowledge or authorization.
Proof-of-concept code that exploits this vulnerability is publicly available.
Oracle has not confirmed the vulnerability and software updates are not available.
Indicators of Compromise
Oracle JRE versions 7 update 21 and prior are affected.
The vulnerability is in the performSSVValidation() method of the sun.plugin2.main.client.PluginMain(Plugin2Manager) component. The method fails to perform sufficient Secure Static Versioning (SSV) validation of a user-supplied applet. This component should display a security warning pop-up message for the user before executing an applet in the Java sandbox environment. However, because of errors in processing variables, the warning message may fail to display.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a malicious web page that is designed to supply an applet with a crafted _applet_ssv_validated parameter. The processing of the applet parameters could cause Java to fail to display the security pop-up message and execute the applet on the system in the security context of the user.
To exploit the vulnerability, the attacker may provide a link to the user and may persuade the user to follow the link by using misleading language and instructions.
Reports indicate that the vulnerability has been fixed in Oracle Java version 7 Update 21. However, vendor confirmation is not publicly available.
Administrators are advised to contact the vendor regarding future updates and releases.
Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.
Users should verify that unsolicited links are safe to follow.
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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.