[NSE] Problems with authentication in ms-sql in Nmap 7.91+

[Paulino Calderon <paulino () calderonpale com>]

Hey,

I was wondering if anyone familiar with the MS-SQL protocol knows what 
might be happening here. The dev branch version crashes at the moment 
when scanning Microsoft SQL Server 2005 9.00.3042; SP2:

NSE: [ms-sql-brute M:b41d0c xx.xx.xx.xx] MSSQL-SSRP: SSRP Data: 
ServerName;XXXX;InstanceName;MSSQLSERVER;IsClustered;No;Version;9.00.3042.00;tcp;1433;;
NSE: [ms-sql-brute M:b41d0c xx.xx.xx.xx] MSSQL-SSRP: SSRP Substrings:
ServerName;XXXX;InstanceName;MSSQLSERVER;IsClustered;No;Version;9.00.3042.00;tcp;1433;;
NSE: [ms-sql-brute M:b41d0c xx.xx.xx.xx] brandedVersion: 2005, #lookup: 5
NSE: UDP 10.0.4.152:48503 > xx.xx.xx.xx:1434 | CLOSE
NSOCK INFO [1.5680s] nsock_iod_delete(): nsock_iod_delete (IOD #1)
NSOCK DEBUG [1.5680s] nsock_set_loglevel(): Set log level to FULL DEBUG
NSOCK DEBUG [1.5700s] nsock_loop(): nsock_loop() started (timeout=50ms). 
0 events pending
NSE: Starting ms-sql-brute M:fe2ad4 against xx.xx.xx.xx:1433.
NSE: [ms-sql-brute M:fe2ad4 xx.xx.xx.xx:1433] TARGET INSTANCESnil
NSE: ms-sql-brute M:fe2ad4 against xx.xx.xx.xx:1433 threw an error!
attempt to index a nil value
stack traceback:
        [C]: in for iterator 'for iterator'
        /usr/local/bin/../share/nmap/nselib/mssql.lua:3305: in function 
</usr/local/bin/../share/nmap/nselib/mssql.lua:3297>
        (...tail calls...)

I think this might be related to 
https://github.com/nmap/nmap/issues/2388 because the password is also 
using the character  @.

Cheers.


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