Summary
The remote host is missing an update as announced
via advisory SSA:2003-236-01.
Solution
https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2003-236-01
Insight
Upgraded gdm packages are available for Slackware 9.0 and -current.
These fix a security issue where a local user may use GDM to read any file on the system.