CloudWatch Route Table Changes Alarm Missing
- Query id: 2285e608-ddbc-47f3-ba54-ce7121e31216
- Query name: CloudWatch Route Table Changes Alarm Missing
- Platform: Terraform
- Severity: Low
- Category: Observability
- CWE: 778
- URL: Github
Description¶
Ensure a log metric filter and alarm exist for route table changes
Documentation
Code samples¶
Code samples with security vulnerabilities¶
Positive test num. 1 - tf file
resource "aws_cloudwatch_log_metric_filter" "cis_route_table_changes_metric_filter" {
name = "CIS-RouteTableChanges"
pattern = "{ ($.eventName = CreateRoute) || ($.eventName = CreateRouteTable) || ($.eventName = ReplaceRoute) || ($.eventName = ReplaceRouteTableAssociation) || ($.eventName = DeleteRouteTable) || ($.eventName = DeleteRoute) || ($.eventName = DisassociateRouteTable) }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-RouteTableChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "cis_route_table_changes_cw_alarm" {
alarm_name = "CIS-3.13-RouteTableChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = "XXXX NOT YOUR FILTER XXXX"
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to route tables will help ensure that all VPC traffic flows through an expected path."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}
Positive test num. 2 - tf file
resource "aws_cloudwatch_log_metric_filter" "cis_unauthorized_api_calls_metric_filter" {
name = "CIS-UnauthorizedAPICalls"
pattern = "{ ($.errorCode = \"*UnauthorizedOperation\") || ($.errorCode = \"AccessDenied*\") }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-UnauthorizedAPICalls"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "cis_unauthorized_api_calls_cw_alarm" {
alarm_name = "CIS-3.1-UnauthorizedAPICalls"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.cis_unauthorized_api_calls_metric_filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring unauthorized API calls will help reveal application errors and may reduce time to detect malicious activity."
alarm_actions = [aws_sns_topic.cis_alerts_sns_topic.arn]
insufficient_data_actions = []
}
Positive test num. 3 - tf file
resource "aws_cloudwatch_log_metric_filter" "cis_route_table_changes_metric_filter" {
name = "CIS-RouteTableChanges"
pattern = "{ ($.eventName = CreateRoute) || ($.eventName = ReplaceRouteTableAssociation) || ($.eventName = DeleteRouteTable) || ($.eventName = DeleteRoute) || ($.eventName = DisassociateRouteTable) }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-RouteTableChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "cis_route_table_changes_cw_alarm" {
alarm_name = "CIS-3.13-RouteTableChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.cis_route_table_changes_metric_filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to route tables will help ensure that all VPC traffic flows through an expected path."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}
Code samples without security vulnerabilities¶
Negative test num. 1 - tf file
resource "aws_cloudwatch_log_metric_filter" "cis_route_table_changes_metric_filter" {
name = "CIS-RouteTableChanges"
pattern = "{ ($.eventName = CreateRoute) || ($.eventName = CreateRouteTable) || ($.eventName = ReplaceRoute) || ($.eventName = ReplaceRouteTableAssociation) || ($.eventName = DeleteRouteTable) || ($.eventName = DeleteRoute) || ($.eventName = DisassociateRouteTable) }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-RouteTableChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "cis_route_table_changes_cw_alarm" {
alarm_name = "CIS-3.13-RouteTableChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.cis_route_table_changes_metric_filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to route tables will help ensure that all VPC traffic flows through an expected path."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}