CVE-2019-18634 EXPLOIT
7.8
HIGH · CVSS 3.1 · EPSS 19.4% (pctl 97)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 19.43% — more likely to be exploited than 97% of all CVEs |
| Weakness | CWE-787 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2020-01-29 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| debian | debian linux |
| sudo project | sudo |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Sudo 1.8.25p - 'pwfeedback' Buffer Overflow | 2020-02-06 |
| exploit-db | Sudo 1.8.25p - 'pwfeedback' Buffer Overflow (PoC) | 2020-02-04 |
References
- 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%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.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/
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