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Vulnerability record · CVE-2019-18634 · published 29 January 2020

CVE-2019-18634: Sudo project sudo out-of-bounds write vulnerability

Sudo Project · Sudo

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.

7.8 CVSS 3.1 High EPSS 19% · top 2.7% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 4.6
19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
52References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html
http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html Third Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html Third Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2020/Jan/40 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/30/6 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/31/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/02/05/2 Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/02/05/5 ExploitThird Party Advisory
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 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7B
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAP
https://seclists.org/bugtraq/2020/Feb/2 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2020/Feb/3 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2020/Jan/44 Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202003-12
https://security.netapp.com/advisory/ntap-20200210-0001/
https://support.apple.com/kb/HT210919 Third Party Advisory
https://usn.ubuntu.com/4263-1/
https://usn.ubuntu.com/4263-2/
https://www.debian.org/security/2020/dsa-4614 Third Party Advisory
https://www.sudo.ws/alerts/pwfeedback.html ExploitVendor Advisory
https://www.sudo.ws/security.html Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html
http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html Third Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html Third Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2020/Jan/40 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/30/6 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/31/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/02/05/2 Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/02/05/5 ExploitThird Party Advisory
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 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7B

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Source: NIST National Vulnerability Database (record CVE-2019-18634), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.