The remote host is missing an update to samba announced via advisory DSA 2175-1.

For the oldstable distribution (lenny), this problem has been fixed in version 3.2.5-4lenny14. For the stable distribution (squeeze), this problem has been fixed in version 3.5.6~dfsg-3squeeze2. For the unstable distribution (sid), this problem will be fixed soon. We recommend that you upgrade your samba packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202175-1

Volker Lendecke discovered that missing range checks in Samba's file descriptor handling could lead to memory corruption, resulting in denial of service.