When Lightning Strikes Thrice: Breaking Thunderbolt 3 Security Other Versions. Related Material. Chaos Computer Club e. Ruytenberg, Björn. When Lightning Strikes Thrice: Breaking Thunderbolt 3 Security. CC Attribution 4. Computer Science. Thunderbolt is a computer port for high-speed data transmission between a PC or laptop and other devices. It is found in hundreds of millions of devices worldwide. We present Thunderspy, a new class of vulnerabilities that break all primary security claims for Thunderbolt 1, 2 and 3. We give a live demo of the attacks, and present a tool for determining whether a system is vulnerable. Finally, we conclude our talk demonstrating our new research on designing and implementing protections against Thunderspy. Thunderbolt is a high-bandwidth interconnect promoted by Intel and included in laptops, desktops, and other systems. In an "evil maid" DMA attack, where adversaries obtain brief physical access to the victim system, Maartmann-Moe InceptionFrisk PCILeech and others have shown Thunderbolt to be a viable entry point in stealing data from encrypted drives and Dry Ice Cleaning Machine Huren and writing all of system memory. In response, Intel introduced "Security Levels", a security architecture designed to enable users to authorize trusted Thunderbolt devices only. To further strengthen device authentication, the system is said to provide "cryptographic authentication of connections" to prevent devices from spoofing user-authorized devices. We present Thunderspy, a series of attacks that break all primary security claims for Thunderbolt 1, 2 and 3. So far, our research has found seven vulnerabilities: inadequate firmware verification schemes, weak device authentication scheme, use of unauthenticated device metadata, downgrade attack using backwards compatibility, use of unauthenticated controller configurations, SPI flash interface deficiencies, and no Thunderbolt security on Boot Camp. Finally, we present nine practical exploitation scenarios. In an "evil maid" threat model and varying Security Levels, we demonstrate the ability to create arbitrary Thunderbolt device identities, clone user-authorized Thunderbolt devices, and finally obtain PCIe connectivity to perform DMA attacks. We conclude with demonstrating the ability to permanently disable Thunderbolt security and block all future firmware updates. All Thunderbolt-equipped systems shipped between are vulnerable. Some systems providing Kernel DMA Protection, shipping sinceare partially vulnerable. The Thunderspy vulnerabilities cannot be fixed in software, impact recently introduced standards such as USB 4 and Thunderbolt 4, and will require a silicon redesign. Finally, we conclude our talk demonstrating our on-going research on designing and implementing protections against Thunderspy. MON r3s Rhein VHS.
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