Processor Security | Breaking Cybersecurity News | The Hacker News

Researchers at ETH Zürich have discovered yet another security flaw that they say impacts all modern Intel CPUs and causes them to leak sensitive data from memory, showing that the vulnerability known as Spectre continues to haunt computer systems after more than seven years. The vulnerability, referred to as Branch Privilege Injection (BPI), "can be exploited to misuse the prediction calculations of the CPU (central processing unit) in order to gain unauthorized access to information from other processor users," ETH Zurich said . Kaveh Razavi, head of the Computer Security Group (COMSEC) and one of the authors of the study, said the shortcoming affects all Intel processors, potentially enabling bad actors to read the contents of the processor's cache and the working memory of another user of the same CPU. The attack leverages what's called Branch Predictor Race Conditions ( BPRC ) that emerge when a processor switches between prediction calculations for two use...

More than six years after the Spectre security flaw impacting modern CPU processors came to light, new research has found that the latest AMD and Intel processors are still susceptible to speculative execution attacks. The attack, disclosed by ETH Zürich researchers Johannes Wikner and Kaveh Razavi, aims to undermine the Indirect Branch Predictor Barrier ( IBPB ) on x86 chips, a crucial mitigation against speculative execution attacks. Speculative execution refers to a performance optimization feature wherein modern CPUs execute certain instructions out-of-order by predicting the branch a program will take beforehand, thus speeding up the task if the speculatively used value was correct. If it results in a misprediction, the instructions, called transient, are declared invalid and squashed, before the processor can resume execution with the correct value. While the execution results of transient instructions are not committed to the architectural program state, it's still ...