Elastic Security Detection Rules

AWS Bedrock Detected Multiple Validation Exception Errors by a Single User

Last updated a month ago on 2025-07-16
Created a year ago on 2024-09-11

About

Identifies multiple validation exeception errors within AWS Bedrock. Validation errors occur when you run the InvokeModel or InvokeModelWithResponseStream APIs on a foundation model that uses an incorrect inference parameter or corresponding value. These errors also occur when you use an inference parameter for one model with a model that doesn't have the same API parameter. This could indicate attempts to bypass limitations of other approved models, or to force an impact on the environment by incurring exhorbitant costs.
Tags
Domain: LLMData Source: AWSData Source: AWS BedrockData Source: AWS S3Use Case: Policy ViolationMitre Atlas: T0015Mitre Atlas: T0034Mitre Atlas: T0046Language: esql
Severity
high
Risk Score
73
False Positive Examples
Legitimate misunderstanding by users on accessing the bedrock models.
License
Elastic License v2(opens in a new tab or window)

Definition

Integration Pack
Prebuilt Security Detection Rules
Related Integrations

aws_bedrock(opens in a new tab or window)

Query
from logs-aws_bedrock.invocation-*

// Truncate timestamp to 1-minute window
| eval Esql.time_window_date_trunc = date_trunc(1 minutes, @timestamp)

// Filter for validation exceptions in responses
| where gen_ai.response.error_code == "ValidationException"

// keep relevant ECS and derived fields
| keep
  user.id,
  gen_ai.request.model.id,
  cloud.account.id,
  gen_ai.response.error_code,
  Esql.time_window_date_trunc

// count number of denials by user/account/time window
| stats
    Esql.ml_response_validation_error_count = count(*)
  by
    Esql.time_window_date_trunc,
    user.id,
    cloud.account.id

// Filter for excessive errors
| where Esql.ml_response_validation_error_count > 3

Install detection rules in Elastic Security

Detect AWS Bedrock Detected Multiple Validation Exception Errors by a Single User in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).