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Vulnerability record · CVE-2005-4890 · published 4 November 2019

CVE-2005-4890: Debian shadow improper input validation vulnerability

Debian · Shadow

There is a possible tty hijacking in shadow 4.x before 4.1.5 and sudo 1.x before 1.7.4 via "su - user -c program". The user session can be escaped to the parent session by using the TIOCSTI ioctl to push characters into the input buffer to be read by the next process.

7.8 CVSS 3.1 High EPSS 0.63% · top 49.3% CWE-20 · Improper input validation
7.8CVSS 3.1 base score, v2 7.2
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
22References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

There is a possible tty hijacking in shadow 4.x before 4.1.5 and sudo 1.x before 1.7.4 via "su - user -c program". The user session can be escaped to the parent session by using the TIOCSTI ioctl to push characters into the input buffer to be read by the next process.

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

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2012/11/06/8 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2013/05/20/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2013/11/28/10 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2013/11/29/5 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2014/10/20/9 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2014/10/21/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2014/12/15/5 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2016/02/25/6 ExploitMailing ListThird Party Advisory
https://access.redhat.com/security/cve/cve-2005-4890 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2005-4890 Issue TrackingThird Party Advisory
https://security-tracker.debian.org/tracker/CVE-2005-4890 Third Party Advisory
http://www.openwall.com/lists/oss-security/2012/11/06/8 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2013/05/20/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2013/11/28/10 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2013/11/29/5 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2014/10/20/9 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2014/10/21/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2014/12/15/5 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2016/02/25/6 ExploitMailing ListThird Party Advisory
https://access.redhat.com/security/cve/cve-2005-4890 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2005-4890 Issue TrackingThird Party Advisory
https://security-tracker.debian.org/tracker/CVE-2005-4890 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2005-4890), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.