Arch Linux Security Advisory ASA-201801-10 ========================================== Severity: High Date : 2018-01-10 CVE-ID : CVE-2017-5715 Package : intel-ucode Type : access restriction bypass Remote : No Link : https://security.archlinux.org/AVG-582 Summary ======= The package intel-ucode before version 20180108-1 is vulnerable to access restriction bypass. Resolution ========== Upgrade to 20180108-1. # pacman -Syu "intel-ucode>=20180108-1" The problem has been fixed upstream in version 20180108. Workaround ========== None. Description =========== An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimization). This variant triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. Impact ====== A local unprivileged attacker is able to cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. References ========== https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-wit... https://spectreattack.com https://www.kb.cert.org/vuls/id/584653 https://xenbits.xen.org/xsa/advisory-254.html https://security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00088&languageid=en-fr https://newsroom.intel.com/wp-content/uploads/sites/11/2018/01/Intel-Analysi... https://security.archlinux.org/CVE-2017-5715