The remote host is missing an update as announced via advisory SSA:2003-300-01.
GDM is the GNOME Display Manager, and is commonly used to provide a graphical login for local users. Upgraded gdm packages are available for Slackware 9.0, 9.1, and -current. These fix two vulnerabilities which could allow a local user to crash or freeze gdm, preventing access to the machine until a reboot. Sites using gdm should upgrade, especially sites such as computer labs that use gdm to provide public or semi-public access. More details about these issues may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0793 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0794