Descriptionpkexec, when used with --user nonpriv, 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 severitymedium (attack range: local)
Debian Bugs812512, 816062

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
policykit-1 (PTS)jessie0.105-15~deb8u2vulnerable
jessie (security)0.105-15~deb8u3vulnerable
buster, sid0.105-21vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
policykit-1source(unstable)(unfixed)medium812512, 816062


[stretch] - policykit-1 <ignored> (Minor issue)
[jessie] - policykit-1 <ignored> (Minor issue)
[wheezy] - policykit-1 <ignored> (Minor issue)
Restricting ioctl on the kernel side seems the better approach

Search for package or bug name: Reporting problems