[sudo-announce] sudo 1.8.20p1 released

Todd C. Miller Todd.Miller at courtesan.com
Tue May 30 10:41:35 MDT 2017

Hash: SHA1

Sudo version 1.8.20p1 is now available.  This release fixes a
potential security issue that may allow a user to bypass the
"tty_ticket" constraints or overwrite an arbitrary file.
The issue is only present on Linux systems.


SHA256 checksum:
MD5 checksum:

Binary packages:

For a list of download mirror sites, see:

Sudo web site:

Sudo web site mirrors:

Major changes between sudo 1.8.20p1 and 1.8.20:

 * Fixed "make check" when using OpenSSL or GNU crypt.
   Bug #787.

 * Fixed CVE-2017-1000367, a bug parsing /proc/pid/stat on Linux
   when the process name contains spaces.  Since the user has control
   over the command name, this could potentially be used by a user
   with sudo access to overwrite an arbitrary file on systems with
   SELinux enabled.  Also stop performing a breadth-first traversal
   of /dev when looking for the device; only a hard-coded list of
   directories are checked,

Major changes between sudo 1.8.20 and 1.8.19p2:

 * Added support for SASL_MECH in ldap.conf. Bug #764

 * Added support for digest matching when the command is a glob-style
   pattern or a directory. Previously, only explicit path matches
   supported digest checks.

 * New "fdexec" Defaults option to control whether a command
   is executed by path or by open file descriptor.

 * The embedded copy of zlib has been upgraded to version 1.2.11.

 * Fixed a bug that prevented sudoers include files with a relative
   path starting with the letter 'i' from being opened.  Bug #776.

 * Added support for command timeouts in sudoers.  The command will
   be terminated if the timeout expires.

 * The SELinux role and type are now displayed in the "sudo -l"
   output for the LDAP and SSSD backends, just as they are in the
   sudoers backend.

 * A new command line option, -T, can be used to specify a command
   timeout as long as the user-specified timeout is not longer than
   the timeout specified in sudoers.  This option may only be
   used when the "user_command_timeouts" flag is enabled in sudoers.

 * Added NOTBEFORE and NOTAFTER command options to the sudoers
   backend similar to what is already available in the LDAP backend.

 * Sudo can now optionally use the SHA2 functions in OpenSSL or GNU
   crypt instead of the SHA2 implementation bundled with sudo.

 * Fixed a compilation error on systems without the stdbool.h header
   file.  Bug #778.

 * Fixed a compilation error in the standalone Kerberos V authentication
   module.  Bug #777.

 * Added the iolog_flush flag to sudoers which causes I/O log data
   to be written immediately to disk instead of being buffered.

 * I/O log files are now created with group ID 0 by default unless
   the "iolog_user" or "iolog_group" options are set in sudoers.

 * It is now possible to store I/O log files on an NFS-mounted
   file system where uid 0 is remapped to an unprivileged user.
   The "iolog_user" option must be set to a non-root user and the
   top-level I/O log directory must exist and be owned by that user.

 * Added the restricted_env_file setting to sudoers which is similar
   to env_file but its contents are subject to the same restrictions
   as variables in the invoking user's environment.

 * Fixed a use after free bug in the SSSD backend when the fqdn
   sudoOption is enabled and no hostname value is present in

 * Fixed a typo that resulted in a compilation error on systems
   where the killpg() function is not found by configure.

 * Fixed a compilation error with the included version of zlib
   when sudo was built outside the source tree.

 * Fixed the exit value of sudo when the command is terminated by
   a signal other than SIGINT.  This was broken in sudo 1.8.15 by
   the fix for Bug #722.  Bug #784.

 * Fixed a regression introduced in sudo 1.8.18 where the "lecture"
   option could not be used in a positive boolean context, only
   a negative one.

 * Fixed an issue where sudo would consume stdin if it was not
   connected to a tty even if log_input is not enabled in sudoers.
   Bug #786.

 * Clarify in the sudoers manual that the #includedir directive
   diverts control to the files in the specified directory and,
   when parsing of those files is complete, returns control to the
   original file.  Bug #775.


More information about the sudo-announce mailing list