According to its banner, the version of Samba 3.x running on the remote host is earlier than 3.6.4 / 3.5.14 / 3.4.16. It is, therefore, affected by multiple heap-based buffer overflow vulnerabilities.
An error in the DCE/RPC IDL (PIDL) compiler causes the RPC handling code it generates to contain multiple heap-based buffer overflow vulnerabilities. This generated code can allow a remote, unauthenticated attacker to use malicious RPC calls to crash the application and possibly execute arbitrary code as the root user.
Binary data 6443.prm