CVE-2005-4890: Debian Linux

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Debian Shadow: from 4.0.0, up to and including 4.1.5
• Red Hat Enterprise Linux: version 4 only; version 5 only; version 6.0 only
• Sudo Project Sudo: from 1.3.0, up to and including 1.7.4

Published 2019-11-04. Last modified 2026-06-16.