CVE-2019-18634 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html http://seclists.org/fulldisclosure/2020/Jan/40 http://www.openwall.com/lists/oss-security/2020/01/30/6 http://www.openwall.com/lists/oss-security/2020/01/31/1 http://www.openwall.com/lists/oss-security/2020/02/05/2 http://www.openwall.com/lists/oss-security/2020/02/05/5 https://access.redhat.com/errata/RHSA-2020:0487 https://access.redhat.com/errata/RHSA-2020:0509 https://access.redhat.com/errata/RHSA-2020:0540 https://access.redhat.com/errata/RHSA-2020:0726 https://lists.debian.org/debian-lts-announce/2020/02/msg00002.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/ https://seclists.org/bugtraq/2020/Feb/2 https://seclists.org/bugtraq/2020/Feb/3 https://seclists.org/bugtraq/2020/Jan/44 https://security.gentoo.org/glsa/202003-12 https://security.netapp.com/advisory/ntap-20200210-0001/ https://support.apple.com/kb/HT210919 https://usn.ubuntu.com/4263-1/ https://usn.ubuntu.com/4263-2/ https://www.debian.org/security/2020/dsa-4614 https://www.sudo.ws/alerts/pwfeedback.html https://www.sudo.ws/security.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8