Arch Linux Security Advisory ASA-202002-2 ========================================= Severity: High Date : 2020-02-06 CVE-ID : CVE-2019-18634 Package : sudo Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-1093 Summary ======= The package sudo before version 1.8.31-1 is vulnerable to privilege escalation. Resolution ========== Upgrade to 1.8.31-1. # pacman -Syu "sudo>=1.8.31-1" The problem has been fixed upstream in version 1.8.31. Workaround ========== Ensure pwfeedback is disabled in /etc/sshd/sshd_config with: Defaults !pwfeedback Description =========== A flaw was found in the Sudo before version 1.8.31 application when the ’pwfeedback' option is set to true on the sudoers file. An authenticated user can use this vulnerability to trigger a stack-based buffer overflow under certain conditions even without Sudo privileges. The buffer overflow may allow an attacker to expose or corrupt memory information, crash the Sudo application, or possibly inject code to be run as a root user. Impact ====== An authenticated user is capable of escalating to root privileges. References ========== https://www.sudo.ws/alerts/pwfeedback.html https://www.sudo.ws/repos/sudo/rev/84640592b0ff https://security.archlinux.org/CVE-2019-18634