ALINUX2-SA-2020%3A0019

Package updates are available for Alibaba Cloud Linux 2.1903 that fix the following vulnerabilities: CVE-2019-18634: In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.