http://169.254.169.254/latest/meta-data/iam/security-credentials/
is a link-local address used by the AWS Instance Metadata Service (IMDS) to provide temporary IAM credentials to EC2 instances. Attackers exploit this endpoint via Server-Side Request Forgery (SSRF) to steal sensitive security credentials, particularly when using the legacy, unprotected IMDSv1. To mitigate these risks, organizations should enforce IMDSv2, which requires session-oriented authentication to secure instance metadata. Read the full guide on defending against this threat at AWS Retrieving Security Credentials from Instance Metadata
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2 Answers. Sorted by: 28. 169.254 is within the link-local address space: https://en.wikipedia.org/wiki/Link-local_address. It's u... Stack Overflow
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The URL you've provided appears to be related to Amazon Web Services (AWS) and is used for retrieving temporary security credentials. Let's break down the components to understand its purpose and implications:
Identity and Access Management (IAM) security credentials are critical for any AWS instance. These credentials define what actions an instance can perform on AWS resources. When an instance needs to interact with AWS services—be it to write to an S3 bucket, monitor metrics in CloudWatch, or perform any other action—it must do so with the appropriate permissions. Fetching IAM security credentials from the metadata service allows instances to understand their permissions without requiring hardcoded credentials.
Least Privilege: Ensure that IAM roles have the least privilege necessary for the instance to function. This means only granting access to the resources that are needed.
Monitoring and Auditing: Regularly monitor and audit the use of these credentials within your AWS environment.
Understanding Instance Metadata: Familiarize yourself with the instance metadata service and understand what information is available and how it can be used.
This URL and the associated metadata service are powerful features of AWS that help manage access to resources securely. Proper understanding and utilization of these features are crucial for maintaining a secure and efficient cloud environment.
The URL you've provided is:
fetch-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fmeta data-2Fiam-2Fsecurity credentials-2F
Let's decode it:
http-3A should be http:
2F represents a forward slash /
So, decoding the entire string:
http-3A-2F-2F translates to http://169.254.169.254 remains the same-2Flatest-2F translates to /latest/meta data-2F translates to meta data/iam-2F translates to iam/security credentials-2F translates to security credentials/The decoded URL is:
http://169.254.169.254/latest/meta data/iam/security credentials/
This URL seems to be related to Amazon Web Services (AWS), specifically an EC2 instance's metadata service. The path /latest/meta-data/iam/security-credentials/ is commonly used to retrieve temporary security credentials for an IAM role attached to an EC2 instance.
If you're working with AWS, this URL is crucial for getting security credentials programmatically from within an EC2 instance.
This string is a URL-encoded command used to target the AWS Instance Metadata Service (IMDS).
Specifically, it attempts to retrieve IAM security credentials (temporary access keys) associated with a specific IAM role assigned to an EC2 instance. What it means
169.254.169.254: This is a link-local IP address used by AWS, Azure, and Google Cloud to provide metadata about the virtual machine.
latest/meta-data/iam/security-credentials/: This specific path is where AWS stores the temporary security tokens for the instance's IAM role.
fetch-url: This prefix suggests the command is being passed through a tool or function (like a Server-Side Request Forgery vulnerability) to make the server "fetch" its own secret keys. ⚠️ Security Risk
If you see this in your web server logs or as part of a bug bounty report, it is an SSRF (Server-Side Request Forgery) attack attempt.
The Goal: An attacker wants to steal your instance's secret keys to gain unauthorized access to your AWS environment.
The Fix: Use IMDSv2, which requires a session token and blocks these simple "fetch" requests.
💡 Pro-Tip: To protect your AWS instances, enforce IMDSv2 and set the "Metadata response hop limit" to 1. Least Privilege : Ensure that IAM roles have
The URL-encoded string targets the AWS Instance Metadata Service (IMDS) via Server-Side Request Forgery (SSRF) to steal IAM security credentials. Accessing these credentials often requires a two-step process to bypass modern IMDSv2 protections by first acquiring a session token, as seen in security challenges. To prevent such exploitation, organizations should enforce IMDSv2, validate URLs, and apply least-privilege policies. For more details, visit Mostafa Hussein's Medium article InfoSec Write-ups
http://169.254.169.254/latest/meta-data/iam/security-credentials/
This URL is used in AWS instances to fetch temporary security credentials for the instance. Here's a breakdown:
169.254.169.254 is a special IP address used for the AWS instance metadata service. This service provides information about the instance and is used for various purposes, including fetching security credentials.
/latest/meta-data/ is part of the path used to access metadata about the instance.
iam/security-credentials/ is used specifically to retrieve the security credentials (such as temporary access keys) associated with the IAM role that an EC2 instance is launched with.
When an EC2 instance is launched with an IAM role, it can use the metadata service to obtain temporary security credentials. These credentials can then be used to access AWS resources without needing to hard-code or configure long-term access keys.
If you're working with AWS and need to understand or implement how instances fetch and use these credentials, this information is crucial. However, if you're looking for general information or have a different context in mind, could you provide more details?
http://169.254.169 is a classic Server-Side Request Forgery (SSRF) attack vector targeting AWS Instance Metadata Service, capable of revealing temporary IAM credentials. An attacker exploits this by forcing a web application to fetch data from the internal, trusted link-local IP, resulting in potential full cloud account takeovers, as demonstrated in the 2019 Capital One breach. Modern AWS IMDSv2 protections require a session token, mitigating this specific "fetch-url" attack.
Access Control: Ensure that only authorized instances and applications can access these credentials. AWS controls access via IAM roles, ensuring that only instances with a role attached can fetch the credentials.
Credential Rotation: Temporary credentials are automatically rotated (updated) by AWS. The instance can request new credentials by accessing the metadata service again, ensuring that credentials are short-lived and reducing the risk of them being compromised.
Use Cases: These credentials are used for applications running on EC2 instances to securely access other AWS services without needing to store long-term credentials on the instance.