A local user who has been granted permission to run commands via sudo could run arbitrary commands as a privileged user due to a flaw in sudo's pathname validation. This bug only affects configurations which have restricted user configurations prior to an ALL directive in the configuration file. A workaround is to move any ALL directives to the beginning of the sudoers file; see the advisory at http://www.sudo.ws/sudo/alerts/path_race.html for more information.
For the old stable Debian distribution (woody), this problem has been fixed in version 1.6.6-1.3woody1.
For the current stable distribution (sarge), this problem has been fixed in version 1.6.8p7-1.1sarge1.
Note that packages are not yet ready for certain architectures; these will be released as they become available.
We recommend that you upgrade your sudo package.
MD5 checksums of the listed files are available in the original advisory.