4.105. sudo

Security Fixes

CVE-2013-1775

A flaw was found in the way sudo handled time stamp files. An attacker able to run code as a local user and with the ability to control the system clock could possibly gain additional privileges by running commands that the victim user was allowed to run via sudo, without knowing the victim's password.

CVE-2013-1776, CVE-2013-2776

It was found that sudo did not properly validate the controlling terminal device when the tty_tickets option was enabled in the /etc/sudoers file. An attacker able to run code as a local user could possibly gain additional privileges by running commands that the victim user was allowed to run via sudo, without knowing the victim's password.

Bug Fixes

BZ#849679

Due to a bug in the cycle detection algorithm of the visudo utility, visudo incorrectly evaluated certain alias definitions in the /etc/sudoers file as cycles. Consequently, a warning message about undefined aliases appeared. This bug has been fixed, /etc/sudoers is now parsed correctly by visudo and the warning message no longer appears.

BZ#855836

Previously, the 'sudo -l' command did not parse the /etc/sudoers file correctly if it contained an Active Directory (AD) group. The file was parsed only up to the first AD group information and then the parsing failed with the following message:

sudo: unable to cache group ADDOM\admingroup, already exists

With this update, the underlying code has been modified and 'sudo -l' now parses /etc/sudoers containing AD groups correctly.

BZ#869287

Previously, the sudo utility did not escape the backslash characters contained in user names properly. Consequently, if a system used sudo integrated with LDAP or Active Directory (AD) as the primary authentication mechanism, users were not able to authenticate on that system. With this update, sudo has been modified to process LDAP and AD names correctly and the authentication process now works as expected.

BZ#905624

Prior to this update, the 'visudo -s (strict)' command incorrectly parsed certain alias definitions. Consequently, an error message was issued. The bug has been fixed, and parsing errors no longer occur when using 'visudo -s'.

Bug Fixes

BZ#916220

The "sudo -l" command did not parse the /etc/sudoers file correctly if it contained an Active Directory (AD) group. The file was parsed only up to the first AD group information and the command then failed with the following error message:

sudo: unable to cache group ADDOM\admingroup, already exists

With this update, the underlying code has been modified so the "sudo -l" command now parses the /etc/sudoers file as it is supposed to and no longer displays this error message.

BZ#916232

Previously, sudo did not escape the backslash characters contained in user names properly. Consequently, if a system used sudo integrated with LDAP or Active Directory as the primary authentication mechanism, users were not able to authenticate on that system. This patch modifies sudo to process LDAP and AD names correctly and the authentication process now functions as expected.