CloudWatch VPC Changes Alarm Missing
- Query id: 9d0d4512-1959-43a2-a17f-72360ff06d1b
- Query name: CloudWatch VPC Changes Alarm Missing
- Platform: Terraform
- Severity: Low
- Category: Observability
- URL: Github
Description¶
Ensure a log metric filter and alarm exist for VPC changes
Documentation
Code samples¶
Code samples with security vulnerabilities¶
Postitive test num. 1 - tf file
resource "aws_cloudwatch_log_metric_filter" "CIS_VPC_Changes_Metric_Filter" {
name = "CIS-VPCChanges"
pattern = "{ ($.eventName = CreateVpc) || ($.eventName = DeleteVpc) || ($.eventName = ModifyVpcAttribute) || ($.eventName = AcceptVpcPeeringConnection) || ($.eventName = CreateVpcPeeringConnection) || ($.eventName = DeleteVpcPeeringConnection) || ($.eventName = RejectVpcPeeringConnection) || ($.eventName = AttachClassicLinkVpc) || ($.eventName = DetachClassicLinkVpc) || ($.eventName = DisableVpcClassicLink) || ($.eventName = EnableVpcClassicLink) }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-VPCChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "CIS_VPC_Changes_CW_Alarm" {
alarm_name = "CIS-3.14-VPCChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = "XXXX NOT YOUR FILTER XXXX"
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to VPC will help ensure that all VPC traffic flows through an expected path."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}
Postitive test num. 2 - tf file
resource "aws_cloudwatch_log_metric_filter" "cis_no_mfa_console_signin_metric_filter" {
name = "CIS-ConsoleSigninWithoutMFA"
pattern = "{ ($.eventName = \"ConsoleLogin\") && ($.additionalEventData.MFAUsed != \"Yes\") }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-ConsoleSigninWithoutMFA"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "cis_no_mfa_console_signin_cw_alarm" {
alarm_name = "CIS-3.2-ConsoleSigninWithoutMFA"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.cis_no_mfa_console_signin_metric_filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring for single-factor console logins will increase visibility into accounts that are not protected by MFA."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}
Postitive test num. 3 - tf file
resource "aws_cloudwatch_log_metric_filter" "CIS_VPC_Changes_Metric_Filter" {
name = "CIS-VPCChanges"
pattern = "{ ($.eventName = CreateVpc) || ($.eventName = ModifyVpcAttribute) || ($.eventName = AcceptVpcPeeringConnection) || ($.eventName = CreateVpcPeeringConnection) || ($.eventName = DeleteVpcPeeringConnection) || ($.eventName = RejectVpcPeeringConnection) || ($.eventName = AttachClassicLinkVpc) || ($.eventName = DetachClassicLinkVpc) || ($.eventName = EnableVpcClassicLink) }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-VPCChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "CIS_VPC_Changes_CW_Alarm" {
alarm_name = "CIS-3.14-VPCChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.CIS_VPC_Changes_Metric_Filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to VPC 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_VPC_Changes_Metric_Filter" {
name = "CIS-VPCChanges"
pattern = "{ ($.eventName = CreateVpc) || ($.eventName = DeleteVpc) || ($.eventName = ModifyVpcAttribute) || ($.eventName = AcceptVpcPeeringConnection) || ($.eventName = CreateVpcPeeringConnection) || ($.eventName = DeleteVpcPeeringConnection) || ($.eventName = RejectVpcPeeringConnection) || ($.eventName = AttachClassicLinkVpc) || ($.eventName = DetachClassicLinkVpc) || ($.eventName = DisableVpcClassicLink) || ($.eventName = EnableVpcClassicLink) }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-VPCChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "CIS_VPC_Changes_CW_Alarm" {
alarm_name = "CIS-3.14-VPCChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.CIS_VPC_Changes_Metric_Filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to VPC 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 = []
}