High severity · published Jan 29, 2020
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
7.8
CVSS
19.3%
EPSS
No
On KEV
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
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)19.3% · higher than 97% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
8.0; 9.0; 10.0 · source: NVD
SU
Sudo · Sudo Project
1.7.1 before 1.8.26 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18634
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-18634
lists.opensuse.org
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html
Third Party Advisory
http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html
Third Party Advisory
http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html
Mailing List
http://seclists.org/fulldisclosure/2020/Jan/40
Mailing List
http://www.openwall.com/lists/oss-security/2020/01/30/6
Mailing List
http://www.openwall.com/lists/oss-security/2020/01/31/1
More from Debian Linux
10.0
CVE-2025-32433
Erlang/OTP SSH Vulnerable to Pre-Authentication RCE
10.0
CVE-2025-24201
Apple Multiple Products WebKit Out-of-Bounds Write Vulnerability
10.0
CVE-2021-44228
Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints
10.0
CVE-2015-3306
ProFTPD Improper Access Control Vulnerability
9.8
CVE-2026-24061
GNU InetUtils Argument Injection Vulnerability