[sudo-announce] sudo 1.8.32 (legacy) released

[Todd C. Miller]

Sudo 1.8.32 is now available.  This is a legacy version of sudo
that contains security fixes for CVE-2021-23239, CVE-2021-23240 and
CVE-2021-3156, backported from the sudo 1.9 branch.

Source:
    https://www.sudo.ws/dist/sudo-1.8.32.tar.gz
    ftp://ftp.sudo.ws/pub/sudo/sudo-1.8.32.tar.gz

SHA256 checksum:
    5ce3c18c5efbecd5437a0945f314f1822423eaf9a2d7eb7ecf80857bc32246c5
MD5 checksum:
    a7318202ba391079a0e32933f0fb8bd6

Binary packages:
    https://github.com/sudo-project/sudo/releases/tag/SUDO_1_8_32

For a list of download mirror sites, see:
    https://www.sudo.ws/download_mirrors.html

Sudo web site:
    https://www.sudo.ws/

Sudo web site mirrors:
    https://www.sudo.ws/mirrors.html

Major changes between sudo 1.8.32 and 1.8.31p2

 * Fixed a regression introduced in sudo 1.8.9 where the "closefrom"
   sudoers option could not be set to a value of 3.  Bug #950.

 * Fixed a regression introduced in sudo 1.8.24 in the LDAP back-end
   where sudoNotBefore and sudoNotAfter were applied even when the
   SUDOERS_TIMED setting was not present in ldap.conf.  Bug #945.

 * Fixed a buffer size mismatch when serializing the list of IP
   addresses for configured network interfaces.  This bug is not
   actually exploitable since the allocated buffer is large enough
   to hold the list of addresses.

 * If sudo is executed with a name other than "sudo" or "sudoedit",
   it will now fall back to "sudo" as the program name.  This affects
   warning, help and usage messages as well as the matching of Debug
   lines in the /etc/sudo.conf file.  Previously, it was possible
   for the invoking user to manipulate the program name by setting
   argv[0] to an arbitrary value when executing sudo.

 * Sudo now checks for failure when setting the close-on-exec flag
   on open file descriptors.  This should never fail but, if it
   were to, there is the possibility of a file descriptor leak to
   a child process (such as the command sudo runs).

 * Fixed CVE-2021-23239, a potential information leak in sudoedit
   that could be used to test for the existence of directories not
   normally accessible to the user in certain circumstances.  When
   creating a new file, sudoedit checks to make sure the parent
   directory of the new file exists before running the editor.
   However, a race condition exists if the invoking user can replace
   (or create) the parent directory.  If a symbolic link is created
   in place of the parent directory, sudoedit will run the editor
   as long as the target of the link exists.  If the target of the
   link does not exist, an error message will be displayed.  The
   race condition can be used to test for the existence of an
   arbitrary directory.  However, it _cannot_ be used to write to
   an arbitrary location.

 * Fixed CVE-2021-23240, a flaw in the temporary file handling of
   sudoedit's SELinux RBAC support.  On systems where SELinux is
   enabled, a user with sudoedit permissions may be able to set the
   owner of an arbitrary file to the user-ID of the target user.
   On Linux kernels that support "protected symlinks", setting
   /proc/sys/fs/protected_symlinks to 1 will prevent the bug from
   being exploited.  For more information see
   https://www.sudo.ws/alerts/sudoedit_selinux.html.

 * Added writability checks for sudoedit when SELinux RBAC is in use.
   This makes sudoedit behavior consistent regardless of whether
   or not SELinux RBAC is in use.  Previously, the "sudoedit_checkdir"
   setting had no effect for RBAC entries.

 * When invoked as sudoedit, the same set of command line options
   are now accepted as for "sudo -e".  The -H and -P options are
   now rejected for sudoedit and "sudo -e" which matches the sudo
   1.7 behavior.  This is part of the fix for CVE-2021-3156.

 * Fixed a potential buffer overflow when unescaping backslashes
   in the command's arguments.  Normally, sudo escapes special
   characters when running a command via a shell (sudo -s or sudo
   -i).  However, it was also possible to run sudoedit with the -s
   or -i flags in which case no escaping had actually been done,
   making a buffer overflow possible.  This fixes CVE-2021-3156.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://www.sudo.ws/pipermail/sudo-announce/attachments/20210209/309c8ac1/attachment.bin>