Atomicorp WAF Rule 331032

Rule Summary

• Rule ID: 331032
• Status: Active
• Alert message: Atomicorp.com WAF Rules: Suspicious activity detected - Host header is a numeric IP address
• Observed CWEs: CWE-306 (1)
• Revision: 4
• Rule severity: Notice (5)
• Phase: 2 (request body)
• Request surfaces: Request headers
• Rule action: pass
• Public tags: no_ar
• Logging: log, auditlog

Description

Note: By default this rule, when used with ASL, does not block anything. It only alerts.

This rule detects when a request is made to an IP address on the web server, as opposed to a host name. For example, if the servers IP address was 1.2.3.4, and the hosts name was www.example.com (opens in a new tab) . If a client/web browser made a request to “www.example.com (opens in a new tab) ”, this rule would not be triggered, however if the client made a request for the actual IP address, 1.2.3.4, this rule would be triggered.

This rule does not block traffic, it simply alerts that the connection may be suspicious. Very few clients make requests to the IP address of the system, most users are connecting with a hostname. However, a high volume of malicious connections are made to systems IP address, as the attackers rarely know the systems host name(s).

If you do not want to be alerted to these cases, simply disable the rule.

If you wish to block these connections, just set this rule to Active Response in the ASL rule manager.

Troubleshooting

False Positives

None.

Tuning Guidance

If you know that this behavior is acceptable for your application, you can either disable the rule for the server, or you can disable it for the application. Because this type of request is to the systems IP address, you can not disable this type of rule for a domain, as these types of requests are to the systems IP.

Please see the Tuning the Atomicorp WAF Rules page for basic information.

Selected Related CVEs

This is a selected list of documented research observations, not an exhaustive coverage matrix. Absence of a CVE does not imply absence of protection.

Observed CWEs

These CWEs are recorded on published CVEs in the selected observations associated with this rule. They are observational relationships, not a claim that the rule universally blocks every vulnerability assigned to a CWE.

Documentation Source

• Original wiki page: WAF 331032
• Source revision: 5492
• Source revision date: 2015-07-17