Rocket Software Unidata udadmin_server Stack Buffer Overflow in Password

This modlue exploits an authentication bypass vulnerability in the
Linux version of udadmin_server, which is an RPC service that comes
with the Rocket Software UniData server, which runs as root.

This vulnerability affects UniData versions 8.2.4 build 3003 and
earlier (for Linux), but this module specifically targets UniData
version 8.2.4 build 3001. Other versions will crash the forked
process, but will not otherwise affect the RPC server.

The username and password fields are copied to a stack-based buffer
using a function that's equivalent to strcpy() (ie, has no bounds
checking). Additionally, the password field is encoded in such a way
that we can include NUL bytes.