CVE-2001-1480

Step 1: Applet Delivery: The attacker crafts a malicious Java applet and delivers it to the victim, typically through a website or email attachment. Step 2: Applet Execution: The victim's web browser or Java runtime environment executes the malicious applet. Step 3: Clipboard Access: The applet uses Java's clipboard API (e.g., java.awt.datatransfer) to access the system clipboard. Step 4: Data Extraction: The applet reads the contents of the clipboard, which may contain sensitive information like passwords, usernames, or other confidential data. Step 5: Data Exfiltration: The applet transmits the stolen data to the attacker's server, potentially using network protocols like HTTP or FTP. Step 6: Clipboard Manipulation (Optional): The applet can also write malicious data to the clipboard, such as a fake password or a malicious command, to be used by the victim later.

The vulnerability stems from a lack of proper access controls within the Java security sandbox for clipboard operations. Specifically, the JRE and SDK versions in question failed to adequately restrict applets from accessing the system clipboard. This allowed untrusted applets to call Java's clipboard API, read the data stored in the clipboard, and potentially write malicious data to it. The root cause is a design flaw where the security manager did not sufficiently enforce the security restrictions for clipboard access, allowing applets to bypass intended security boundaries. The lack of proper validation and authorization checks on clipboard operations is the core issue.