[sudo-workers] sudo 1.9.8b2 released

Todd C. Miller Todd.Miller at sudo.ws
Thu Aug 19 12:33:39 MDT 2021

The second beta release of sudo 1.9.8 is now available.

In addition to bug fixes, sudo 1.9.8 adds a new "intercept" mode
that can be used to intercept the execve() system call in the command
run by sudo and do a policy check on sub-commands before they are
executed.  Intercept mode uses LD_PRELOAD and a socket pair to
communicate with the main sudo process to perform the sudoers check.
As such, there are some limitations.  See the sudoers man page for

Sudo 1.9.8 also includes a new sudoers setting, log_children, which
works like intercept mode but only logs the command that was run
and does not validate it against the sudoers file.


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 1.9.8b2 and 1.9.8b1:

 * Sudo will no longer permit a set-user-ID or set-group-ID program
   to be run in intercept mode unless the new "intercept_allow_setid"
   sudoers setting is enabled.

 * The mksigname and mksiglist helper programs are now built with
   the host compiler, not the target compiler, when cross-compiling.
   Bug #989.

Major changes between sudo 1.9.8b1 and 1.9.7p2:

 * It is now possible to transparently intercepting sub-commands
   executed by the original command run via sudo.  Intercept support
   is implemented using LD_PRELOAD (or the equivalent supported by
   the system) and so has some limitations.  The two main limitations
   are that only dynamic executables are supported and only the
   execve() system call is currently intercepted.  Its main use
   case is to support restricting privileged shells run via sudo.

   To support this, there is a new "intercept" Defaults setting and
   an INTERCEPT command tag that can be used in sudoers.  For example:

    Cmnd_Alias SHELLS=/bin/bash, /bin/sh, /bin/csh, /bin/ksh, /bin/zsh
    Defaults!SHELLS intercept

   would cause sudo to run the listed shells in intercept mode.
   This can also be set on a per-rule basis.  For example:

    Cmnd_Alias SHELLS=/bin/bash, /bin/sh, /bin/csh, /bin/ksh, /bin/zsh

   would only apply intercept mode to user "chuck" when running one
   of the listed shells.

 * The new "log_children" sudoers setting can be used to log commands
   run in a privileged shell.  It uses the same mechanism as the
   intercept support described above and has the same limitations.

 * Support for logging sudo_logsrvd errors via syslog or to a file.
   Previously, most sudo_logsrvd errors were only visible in the
   debug log.

 * Better diagnostics when there is a TLS certificate validation error.

 * Using the "+=" or "-=" operators in a Defaults setting that takes
   a string, not a list, now produces a warning from sudo and a
   syntax error from inside visudo.

 * Fixed a bug where the "iolog_mode" setting in sudoers and sudo_logsrvd
   had no effect when creating I/O log parent directories if the I/O log
   file name ended with the string "XXXXXX".

 * Fixed a bug in the sudoers custom prompt code where the size
   parameter that was passed to the strlcpy() function was incorrect.
   No overflow was possible since the correct amount of memory was
   already pre-allocated.
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