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Firewall Attacks

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#1 ikillya69


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Posted 06 October 2007 - 07:41 PM

is it normal to have alot of blocked attempts by the same worm from different ips?
here is what it says 06/10/2007 7:57:49 PM Intrusion.Win.MSSQL.worm.Helkern
this is my first today but some days i get alot.

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#2 quietman7


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Posted 06 October 2007 - 10:30 PM

A firewall enforces an access control policy to permit or block (allow or deny) traffic. It acts as a central gateway for traffic going to and from your computer, denying illegitimate transfers and facilitating access which is deemed legitimate.

The goal of the firewall is to prevent remote computers from accessing yours and provide an alert of unrequested traffic that was blocked along with the IP address. Even your ISP will send out regular checks to see if your computer is still there.

Firewall alert messages are a response to unrequested traffic from remote computers. These alerts are often classified by the network port they arrive on and allow you to see the activity of what is happening on your firewall. The alerts allow the firewall to notify you in various ways about possible penetration and intrusion attempts on your computer. It is not unusal for a firewall to provide numerous alerts regarding such attempted access. Infected machines scour the net and will randomly scan a block of IP addresses. They search for vulnerable ports and make repeated attempts to access them. Your firewall is doing its job by blocking this kind of traffic and alerting you about these intrusion attempts.

If the alerts become too annoying, you should be able to go into your firewall settings and turn them off (Hide notification messages).

Note: The MSSQL worm (aka: SQL Slammer/Helkern/Sapphire) exploits vulnerabilities in Microsoft SQL 2000 servers and only affects unpatched systems (SQL servers not running SP3 for Microsoft SQL Server Desktop Engine). See Microsoft Security Bulletin MS02-039.

Edited by quietman7, 06 October 2007 - 10:34 PM.

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