Arch Linux Security Advisory ASA-201902-6 ========================================= Severity: High Date : 2019-02-11 CVE-ID : CVE-2019-5736 Package : runc Type : privilege escalation Remote : Yes Link : https://security.archlinux.org/AVG-878 Summary ======= The package runc before version 1.0.0rc6-1 is vulnerable to privilege escalation. Resolution ========== Upgrade to 1.0.0rc6-1. # pacman -Syu "runc>=1.0.0rc6-1" The problem has been fixed upstream in version 1.0.0rc6. Workaround ========== Don't run privileged containers. Description =========== A vulnerability discovered in runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc binary (and consequently obtain host root access) by leveraging the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec. This occurs because of file-descriptor mishandling, related to /proc/self/exe. Impact ====== A malicious container can escalate privileges to gain access as root on the host system and execute arbitrary code. References ========== https://github.com/lxc/lxc/commit/6400238d08cdf1ca20d49bafb85f4e224348bf9d https://github.com/opencontainers/runc/commit/0a8e4117e7f715d5fbeef398405813... https://www.openwall.com/lists/oss-security/2019/02/11/2 https://security.archlinux.org/CVE-2019-5736