Cloudwatch Security Group Changes Alarm Missing
- Query id: 4beaf898-9f8b-4237-89e2-5ffdc7ee6006
- Query name: Cloudwatch Security Group Changes Alarm Missing
- Platform: Terraform
- Severity: Medium
- Category: Observability
- URL: Github
Description¶
Ensure a log metric filter and alarm exist for security group changes
Documentation
Code samples¶
Code samples with security vulnerabilities¶
Postitive test num. 1 - tf file
resource "aws_cloudwatch_log_metric_filter" "CIS_Security_Group_Changes_Metric_Filter" {
name = "CIS-SecurityGroupChanges"
pattern = "{ ($.eventName = AuthorizeSecurityGroupIngress) || ($.eventName = AuthorizeSecurityGroupEgress) || ($.eventName = RevokeSecurityGroupIngress) || ($.eventName = RevokeSecurityGroupEgress) || ($.eventName = CreateSecurityGroup) || ($.eventName = DeleteSecurityGroup)}"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-SecurityGroupChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "CIS_Security_Group_Changes_CW_Alarm" {
alarm_name = "CIS-3.10-SecurityGroupChanges"
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 security group will help ensure that resources and services are not unintentionally exposed."
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_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 = []
}
Postitive test num. 3 - tf file
resource "aws_cloudwatch_log_metric_filter" "CIS_Security_Group_Changes_Metric_Filter" {
name = "CIS-SecurityGroupChanges"
pattern = "{ ($.eventName = AuthorizeSecurityGroupIngress) || ($.eventName = RevokeSecurityGroupIngress) || ($.eventName = CreateSecurityGroup) || ($.eventName = DeleteSecurityGroup)}"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-SecurityGroupChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "CIS_Security_Group_Changes_CW_Alarm" {
alarm_name = "CIS-3.10-SecurityGroupChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.CIS_Security_Group_Changes_Metric_Filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to security group will help ensure that resources and services are not unintentionally exposed."
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_Security_Group_Changes_Metric_Filter" {
name = "CIS-SecurityGroupChanges"
pattern = "{ ($.eventName = AuthorizeSecurityGroupIngress) || ($.eventName = AuthorizeSecurityGroupEgress) || ($.eventName = RevokeSecurityGroupIngress) || ($.eventName = RevokeSecurityGroupEgress) || ($.eventName = CreateSecurityGroup) || ($.eventName = DeleteSecurityGroup)}"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-SecurityGroupChanges"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_metric_alarm" "CIS_Security_Group_Changes_CW_Alarm" {
alarm_name = "CIS-3.10-SecurityGroupChanges"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.CIS_Security_Group_Changes_Metric_Filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring changes to security group will help ensure that resources and services are not unintentionally exposed."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}