The remote host is missing an update to samba announced via advisory DSA 1409-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201409-1

Several local/remote vulnerabilities have been discovered in samba, a LanManager-like file and printer server for Unix. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2007-5398 Alin Rad Pop of Secunia Research discovered that nmbd did not properly check the length of netbios packets. When samba is configured as a WINS server, a remote attacker could send multiple crafted requests resulting in the execution of arbitrary code with root privileges. CVE-2007-4572 Samba developers discovered that nmbd could be made to overrun a buffer during the processing of GETDC logon server requests. When samba is configured as a Primary or Backup Domain Controller, a remote attacker could send malicious logon requests and possibly cause a denial of service. For the stable distribution (etch), these problems have been fixed in version 3.0.24-6etch5. For the old stable distribution (sarge), these problems have been fixed in version 3.0.14a-3sarge7. For the unstable distribution (sid), these problems have been fixed in version 3.0.27-1. We recommend that you upgrade your samba packages.