Difference between revisions of "HIDS 4151"

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== FAQs ==
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See this FAQ:
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https://www.atomicorp.com/wiki/index.php/ASL_FAQ#DROP_ASL_INPUT
  
 
== Knowledge Base Articles==  
 
== Knowledge Base Articles==  

Revision as of 16:07, 21 October 2013

Rule 4151
Status Active
Alert Message Multiple Firewall drop events from same source.

Contents

Description

ASL has detected multiple attempts to access a port that the firewall has been configured by the user to block, and ASL has blocked this access. When ASL detects this has occurred multiple times, it will also shun the IP address based on the OSSEC_SHUN_TIME configured on the system.

The Linux kernel also supports stateful packet inspection. This rule can also be triggered if a connection is broken and is generating out of sequence packets. This is not a bug in ASL or in the kernel. This is exactly what stateful packet inspection is supposed to do. If you are triggering this rule on allowed traffic, please make sure you have FW_DROP_INVALID enabled for your system. This will detect these non-malicious out of sequence packets, and will ignore them.

Troubleshooting

False Positives

None.

If you do not wish to block access to this port, please see the Tuning Guidance below.

Tuning Guidance

To configure the firewall to allow connections to this port, please see the ASL firewall documentation page.

Additional Information

Similar Rules

None.

FAQs

See this FAQ:

https://www.atomicorp.com/wiki/index.php/ASL_FAQ#DROP_ASL_INPUT

Knowledge Base Articles

None.

Outside References

None.

Notes

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