Stack-based buffer overflow in Sudo - CVE-2019-18634

Detailed vulnerability description

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the getln() function in tgetpass.c, if pwfeedback is enabled in /etc/sudoers. A local user can trigger stack-based buffer overflow and execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

How to mitigate CVE-2019-18634

Sources

• http://www.openwall.com/lists/oss-security/2020/01/30/6
• http://www.openwall.com/lists/oss-security/2020/01/31/1
• https://seclists.org/bugtraq/2020/Jan/44
• https://support.apple.com/kb/HT210919
• https://www.sudo.ws/alerts/pwfeedback.html
• https://www.sudo.ws/security.html