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Potential HTTP Downgrade Attack

Through the new_terms rule type, this rule detects potential HTTP downgrade attacks by identifying HTTP traffic that uses a different HTTP version than the one typically used in the environment. An HTTP downgrade attack occurs when an attacker forces a connection via an older HTTP version, resulting in potentially less secure communication. For example, an attacker might downgrade a connection from HTTP/2 to HTTP/1.1 or HTTP/1.0 to exploit known vulnerabilities or weaknesses in the older protocol versions.

Rule type: new_terms
Rule indices:

  • logs-nginx.access-*
  • logs-apache.access-*
  • logs-apache_tomcat.access-*

Rule Severity: low
Risk Score: 21
Runs every:
Searches indices from: now-9m
Maximum alerts per execution: ?
References:

Tags:

  • Domain: Web
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Data Source: Nginx
  • Data Source: Apache
  • Data Source: Apache Tomcat

Version: ?
Rule authors:

  • Elastic

Rule license: Elastic License v2

http.version:*

Framework: MITRE ATT&CK