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Thereafter, we tried querying AWS metadata through multiple endpoints, such as: Once SSRF was confirmed, we then moved towards confirming that the service provider is Amazon through server fingerprinting using services such as. view_pospdocument.php?doc=localhost/server-statusįigure 4: Confirming SSRF by accessing the restricted page The vulnerability was confirmed by making a DNS Call to an external domain and this was further verified by accessing the "localhost/server-status" which was configured to only allow localhost to access it as shown in the Figure 4 below. While we were continuing with our regular pentest, we came across an occurrence of Server-Side Request Forgery (SSRF) vulnerability in the application. Buckets are accessible only if bucket name starts with “ elasticbeanstalk-”, and recursive access is also granted.įigure 3: Managed Policy – “AWSElasticBeanstalkWebTier” Policy “ AWSElasticBeanstalkWebTier” allows limited List, Read and Write permissions on the S3 Buckets. AWSElasticBeanstalkMulticontainerDocker – Grants permissions for the Amazon Elastic Container Service to coordinate cluster tasks.AWSElasticBeanstalkWorkerTier – Grants permissions for log uploads, debugging, metric publication, and worker instance tasks, including queue management, leader election, and periodic tasks.AWSElasticBeanstalkWebTier – Grants permissions for the application to upload logs to Amazon S3 and debugging information to AWS X-Ray.Managed Policies for default Instance Profile – aws-elasticbeanstalk-ec2-role: This means that by default, objects are stored unencrypted in the bucket (and are accessible only by authorized users).
#MAC OS ZIP COMMAND LINE ELASTIC BEANSTALK ZIP FILE#
When the code is deployed from the user computer, a copy of the source code in the zip file is placed in the S3 bucket named elasticbeanstalk region-account-idĮlastic Beanstalk doesn’t turn on default encryption for the Amazon S3 bucket that it creates. It also creates a default instance profile, called aws-elasticbeanstalk-ec2-role, which is mapped to the EC2 instance with default permissions. When a new environment is provisioned, AWS creates an S3 Storage bucket, Security Group, an EC2 instance.
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Worker Environment – Suited for background jobs, long-running processes.Ī new application can be configured by providing some information about the application, environment and uploading application code in the zip or war files.įigure 1: Creating an Elastic Beanstalk Environment.Web Server environment – Typically suited to run a web application or web APIs.Provisioning an EnvironmentĪWS Elastic Beanstalk supports Web Server and Worker environment provisioning.
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It automatically handles the deployment, capacity provisioning, load balancing, auto-scaling, and application health monitoring. AWS Elastic BeanstalkĪWS Elastic Beanstalk, is a Platform as a Service (PaaS) offering from AWS for deploying and scaling web applications developed for various environments such as Java. Further, the blog discusses the potential areas which could lead to Remote Code Execution (RCE) on the application deployed on AWS Elastic Beanstalk with Continuous Deployment (CD) pipeline. In this blog, Sunil Yadav, our lead trainer for " Advanced Web Hacking " training class, will discuss a case study where a Server-Side Request Forgery (SSRF) vulnerability was identified and exploited to gain access to sensitive data such as the source code.