


\'Sinkclose\' vulnerability discovered in post-2006 AMD chips could pose a critical threat to data security
Severe security vulnerabilities rarely occur, but they are a major inconvenience when they do. The 0.0.0.0 Day exploit is one recent example of the same. This latest one is dubbed Sinkclose, and it has been discovered in AMD processors dating back to 2006. The flaw allows malicious actors to gain unprecedented access to a computer system, potentially enabling data theft, surveillance, and system control.
The vulnerability exploits a weakness in the System Management Mode (SMM) of AMD chips, a privileged area typically reserved for critical firmware operationssuch as power management, thermal control, hardware initialization, and security functions. By manipulating a feature called TClose, attackers can bypass security safeguards and execute their own code at the SMM level, granting them near-total control over the system.
The implications? Possibly quite serious. Malware installed through Sinkclose can be very difficult to remove, likely leading to a complete system replacement in worst-case scenarios. If users pop the CPU out of an infected system and use it with new components, the new system will get infected. Those with malicious intent can even go to the lengths of reselling such CPUs and potentially gain control of multiple systems over time.
AMD has acknowledged the issue and released patches for its EPYC datacenter and Ryzen PC products, with additional mitigations for embedded systems (used in automation and transportation) on the way. However, the company also zoomed in to discuss the complexity of exploiting the vulnerability. In a statement to WIRED, AMD compared the Sinkclose technique to a method for accessing a bank's safe-deposit boxes after already bypassing its alarms, the guards, and vault door.
As tech evolves, so do the threats targeting it. To protect against Sinkclose, users should prioritize installing available patches from exclusively AMD and their system manufacturers. While the risk might seem low for the average user, the potential consequences are severe enough to warrant immediate action. We're talking data theft, system takeover or even espionage, where nation-state actors could exploit the vulnerability to spy on individuals or organizations.
If you want to take a look at all AMD products affected by Sinkclose, the company has them listed here.
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