Covert channels through branch predictors
WebJul 20, 2024 · We also estimate the capacity of the branch predictor covert channels and describe a software-only mitigation technique that is based on randomizing the state of the predictor tables on context ... Webexfiltration of unintended secrets through observing speculative PHT updates (in the form of covert and side channels). We further investigate the PHT collision mechanism in the history-based predictor and the branch prediction mode transitions in Intel processors.
Covert channels through branch predictors
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WebIn this paper, we introduce a new mechanism for covert communication using the processor branch pre-diction unit. Specifically, we demonstrate how a trojan and a spy can manipulate the branch prediction tables in a way that creates high-capacity, robust and … WebCovert channels through shared processor resources provide secret communication between two malicious processes: the trojan and the spy. In this article, we classify, analyze, and compare covert channels through dynamic branch prediction units in modern …
WebIn this article, we classify, analyze, and comprehensively compare covert channels through processor branch predictor unit. This covert channel is possible because the branch predictor is shared by multiple applications running on the same CPU. Further-more, the contents of the branch predictor tables are not flushed on context switches. WebIn this paper, we introduce a new mechanism for covert communica-tion using the processor branch prediction unit. Specifically, we demonstrate how a trojan and a spy can manipulate the branch prediction tables in a way that creates high-capacity, robust and …
WebFeb 1, 2001 · Covert channels through shared processor resources provide secret communication between two malicious processes: the trojan and the spy. In this article, we classify, analyze, and compare covert ... WebFeb 8, 2024 · Configuring Workloads for Microarchitectural and Side Channel Security. Incidental channels in computing systems are unintended communication channels formed by valid properties such as execution time, power consumption, and the use of shared resources. When data flows through an incidental channel, both data values and …
WebCiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Covert channels through shared processor resources provide secret communication between malicious processes. In this paper, we introduce a new mechanism for covert communica-tion using the processor branch prediction unit. Specifically, we demonstrate how a …
WebWe construct two covert channel attacks: (1) A Prime+Probe covert channel attack using the shared LLC (Section III); and (2) a contention based covert channel using contention on the shared bus to reach the LLC (Section IV). For each attack, we had to solve a number of unique challenges that arise due to the asymmetric nature of the channels (e ... high download low uploadWebIn this exercise, you will implement and experiment with covert channel communications using branch predictors. In computer security, a covert channel is a type of security and surveillance evading technique that enables data transfer and digital communications between processes that are not allowed to communicate according to security or access … how fast do ostriches runWebSep 30, 2024 · This leaves attackers with the opportunities to perform side-channel attacks on the branch predictor. This paper focuses on the saturating counter to explore a secure and lightweight design to mitigate branch predictor side-channel attacks. ... Abu … high download high pingWebthe outside world via an encrypted channel. A covert channel can enable the mailer to leak the raw secrets, bypassing encryption. Covert channels that utilise OS-managed spatial resources (stor-age channels) can be eliminated completely, as was proved for the seL4 microkernel [23]. Harder to control are channels that target high download speed but low upload speedWebCovert channels can tunnel through secure operating systems and require special measures to control. Covert channel analysis is the only proven way to control covert channels. [citation needed] By contrast, secure operating systems can easily prevent … high download mp3Webobservable by an unprivileged attacker through a covert channel. Unfortunately, while new attack variants are continuously being discovered, we do not have a systematic way to characterize ... v1.2, v2) leverage the mis-training of the branch predictors, Intel, AMD and ARM have proposed defenses to prevent mis-training, e.g., Indirect Branch ... high download speed but slow internetWebJul 21, 2024 · We further investigate PHT collision mechanism in the history-based predictor as well as the branch prediction mode transitions in Intel processors. Built upon such knowledge, we implement an ultra high-speed covert channel (BranchSpectre-cc) … high download antivirus play store