Descriptionchroot in GNU coreutils, when used with --userspec, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow (attack range: local)
Debian Bugs816320

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
coreutils (PTS)wheezy8.13-3.5vulnerable
buster, sid8.28-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[stretch] - coreutils <ignored> (Minor issue)
[jessie] - coreutils <ignored> (Minor issue)
[wheezy] - coreutils <ignored> (Minor issue)
Restricting ioctl on the kernel side seems the better approach, but rejected by Linux upstream
Fixing this issue via setsid() would introduce regressions:

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