I am facing catalogue search attack. In dash board code looks like this (-1' OR 3+133-133-1=0+0+0+1). I donot know what to do. and how to prevent it. Even i have applied recent patch.
Don't worry about these searches. The fact that they show up in the admin is actually proof that the attack failed. It happens from time to time. If it appears to happen a lot (multiple attacks a day), try talking to your hoster to see how you can harden your server and Magento installation.