CloudWatch Unauthorized Access Alarm Missing
- Query id: 4c18a45b-4ab1-4790-9f83-399ac695f1e5
- Query name: CloudWatch Unauthorized Access Alarm Missing
- Platform: Terraform
- Severity: High
- Category: Observability
- URL: Github
Description¶
Ensure a log metric filter and alarm exist for unauthorized API calls
Documentation
Code samples¶
Code samples with security vulnerabilities¶
Postitive test num. 1 - tf file
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 = "XXXX NOT YOUR FILTER XXXX"
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 = []
}
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_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. 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_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 = []
}
resource "aws_cloudwatch_log_metric_filter" "cis_unauthorized_api_calls_metric_filter" {
name = "CIS-UnauthorizedAPICalls"
pattern = "{ $.errorCode = \"AccessDenied*\" }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-UnauthorizedAPICalls"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
Postitive test num. 4 - tf file
resource "aws_cloudwatch_metric_alarm" "cis_unauthorized_api_calls_cw_alarm" {
alarm_name = "CIS-3.1-UnauthorizedAPICalls"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.cis_unauthorized_api_calls_metric_filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring unauthorized API calls will help reveal application errors and may reduce time to detect malicious activity."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}
resource "aws_cloudwatch_log_metric_filter" "cis_unauthorized_api_calls_metric_filter" {
name = "CIS-UnauthorizedAPICalls"
pattern = "{ ($.errorCode = \"*UnauthorizedOperation\") && ($.errorCode = \"AccessDenied*\") }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-UnauthorizedAPICalls"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
Code samples without security vulnerabilities¶
Negative test num. 1 - tf file
resource "aws_cloudwatch_metric_alarm" "cis_unauthorized_api_calls_cw_alarm" {
alarm_name = "CIS-3.1-UnauthorizedAPICalls"
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "1"
metric_name = aws_cloudwatch_log_metric_filter.cis_unauthorized_api_calls_metric_filter.id
namespace = "CIS_Metric_Alarm_Namespace"
period = "300"
statistic = "Sum"
threshold = "1"
alarm_description = "Monitoring unauthorized API calls will help reveal application errors and may reduce time to detect malicious activity."
alarm_actions = [aws_sns_topic.CIS_Alerts_SNS_Topic.arn]
insufficient_data_actions = []
}
resource "aws_cloudwatch_log_metric_filter" "cis_unauthorized_api_calls_metric_filter" {
name = "CIS-UnauthorizedAPICalls"
pattern = "{ ($.errorCode = \"*UnauthorizedOperation\") || ($.errorCode = \"AccessDenied*\") }"
log_group_name = aws_cloudwatch_log_group.CIS_CloudWatch_LogsGroup.name
metric_transformation {
name = "CIS-UnauthorizedAPICalls"
namespace = "CIS_Metric_Alarm_Namespace"
value = "1"
}
}
resource "aws_cloudwatch_log_metric_filter" "cis_no_mfa_console_signin_metric_filter" {
name = "CIS-ConsoleSigninWithoutMFA"
pattern = "{ ($.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 = []
}