The remote host is missing an update as announced via advisory SSA:2005-172-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2005-172-01

New Sudo packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, and -current to fix a security issue. A race condition could allow a user with Sudo privileges to run arbitrary commands. For more details, see: http://www.courtesan.com/sudo/alerts/path_race.html