Rule Category

PROTOCOL-DNS -- Snort alerted on a Domain Name Server (DNS) protocol issue. These packets travel over UDP on port 53 to serve DNS queries--user website requests through a browser. Several vulnerability use-cases exist (ie, additional data could be sent with a request, which would contact a DNS server pre-prepared to send information back and forth).

Alert Message

PROTOCOL-DNS HAProxy dns_read_name compressed name denial of service attempt

Rule Explanation

This rule checks for value that leads to recursively points to itself and cause a loop with unreachable exit condition

What To Look For

This rule alerts on return exploit traffic

Known Usage

No public information

False Positives

Known false positives, with the described conditions



Cisco Talos Intelligence Group

Rule Groups

MITRE::ATT&CK Framework::Enterprise::Impact::Endpoint Denial of Service::Application or System Exploitation


Additional Links

Rule Vulnerability

Denial of Service

Denial of Service attacks aim to make a server or program unresponsive for users. These attacks may be volume-based, to overwhelm the system, or they may use certain logical flaws in the software to cut the service off from the users. The attack may come from one or multiple sources. These attacks do not usually lead to a remote code execution. Volume based attacks are best handled using a firewall application.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.
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