ArchLinux: 201705-25: sudo: access restriction bypass
Summary
On Linux systems, sudo parses the /proc/[pid]/stat file to determine the device number of the process's tty (field 7). The fields in the file are space-delimited, but it is possible for the command name (field 2) to include spaces, which sudo does not account for. A user with sudo privileges can cause sudo to use a device number of the user's choosing by creating a symbolic link from the sudo binary to a name that contains a space, followed by a number. This may allow a user to be able to bypass the "tty_ticket" constraints. In order for this to succeed there must exist on the machine a terminal device that the user has previously authenticated themselves on via sudo within the last time stamp timeout (5 minutes by default).
Resolution
Upgrade to 1.8.20.p1-1.
# pacman -Syu "sudo>=1.8.20.p1-1"
The problem has been fixed upstream in version 1.8.20.p1.
References
https://www.sudo.ws/alerts/linux_tty.html http://www.openwall.com/lists/oss-security/2017/05/30/16 https://www.sudo.ws/repos/sudo/raw-rev/b5460cbbb11b https://security.archlinux.org/CVE-2017-1000367
Workaround
None.