Questions tagged [aws]

Amazon Web Services (AWS) are a set of cloud services offered by Amazon.

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99 views

Can I rely on Operating System (OS) Anti Virus (AV) scanning to scan files shares?

I have an EC2 instance with an Windows OS with anti virus installed. I have a requirement to attach a file share to the OS where the application is hosted. The file share is Amazon Fsx ( Amazon's ...
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41 views

Are AWS security groups enough to segment network and reduce PCI scope?

I was reading this paper https://d1.awsstatic.com/whitepapers/pci-dss-scoping-on-aws.pdf It shows this image Am I correct in saying that - as long as instances have proper security groups that ...
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83 views

bugbounty stuck, but try to dig deeper [closed]

0 Im stuck on the client pentest I have already found SSRF on a client machine (aws ec2 UBUNTU): (and PHP curl 7.26.0v calls) 1.domain.de/uri=gopher://xxx can send anything in binary but only ...
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37 views

Gmail's MFA for team?

We have mailboxes on G-Suite from Goole. Currently, we are enabling MFA for all boxes in our team, but what boxes which are used by different people? For now, I found a few solutions, each with its ...
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44 views

Is AWS Cognito vulnerable to MITM when using iOS with Lambda and RDS

I'm a bit new to coding backend services. And I'm not sure how to solve this problem. So users in an iOS app can be authenticated with Cognito and afterwards gain the rights to invoke lambda ...
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1answer
56 views

AWS S3 resource access control through IAM permissions or bucket policies?

The way we create buckets in our org and ensure sane ACLs around it is by providing an automated tool (that internally uses Terraform) to provision an S3 bucket. So say when a user requests for a new ...
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1answer
70 views

Is detecting if an email has an account considered a vulnerability with AWS cognito?

Am doing a pen test on a client system using AWS Cognito and userpools for authentication using the client side SDK provided by AWS. during the forget password flow, I noticed that Cognito request ...
2
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1answer
68 views

Amazon Web Services ELB has permission to change DNS records by default?

I'm creating an ECS (Elastic Container Service) service on AWS. For that service, I need to supply an application load balancer. The default role for it is the following: AWSServiceRoleForECS. When I ...
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50 views

User access control and management in AWS Environment

wondering what other SMBs are doing to manage dynamic access requirements for AWS platform. Currently we have 3 IAM roles (admin, dev, readonly) which users can choose after authenticating with https:...
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40 views

What are some common AWS Lamdba (specific) Security Pitfalls, Auditing Tools, and Methods of Mitigation?

I am writing a research paper detailing the security vulnerabilities of serverless AWS lambda applications, and how to prevent them. I am also compiling a list of security auditing tools that are ...
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1answer
110 views

Is it Possible to Prevent a Physcial Attack on Server in Remote Data Center?

I've been using Amazon Web Services to run my Java application. However, due to high costs I'm looking into getting a dedicated server from Hetzner, a company based in Germany, which costs about 10-...
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1answer
68 views

is there any need to encrypt sensitive images in a database?

I have a project that requires users to submit a photo of a driver's license as proof of identity. This image just needs to be seen once by an administrator, and has no use after their id is verified. ...
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1answer
131 views

How to disclose an open S3 bucket?

What is the most responsible way of disclosing an open AWS S3 bucket? Let's say there are sensitive documents inside, such as contracts with the company logo, that lead you to believe that it ...
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1answer
74 views

Is it possible to securely run user defined python code in AWS?

I would like to create an app that accepts users python scripts and executes them as part of its functionality. What I am wondering is if its possible to block I/O, network and other attack vectors so ...
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64 views

Is there a way to get a forensic image of EC2 instance [closed]

I currently have an instance on AWS which was compromised and resulted in me losing control. I have shutdown the instance since then, but require a forensic image of the volume so that I can analyze ...
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2answers
91 views

Differences between the Root user and users with AdministratorAccess in AWS

I am trying to determine the differences (if any) between using the AWS Root user, or a user within the AdministratorAccess group in AWS. The AdministratorAccess is given the following privileges: { ...
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1answer
59 views

How we can PoC our product that needs training data for our machine learning algorithm of the the bank clients?

Recently, we have had a challenge with potential future clients which are the bank. Our product requires to gather static data (e.g. address, loans, last 50 transactions, etc) of banks clients. These ...
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116 views

Information disclosure with AWS response headers

I'm currently testing a web application hosted on AWS. In the response headers, I've noticed various Amazon-related headers, I've never really seen before. The headers include: x-amzn-RequestId: <...
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85 views

Windows Firewall blocking local access to SQL Server?

I have an AWS virtual machine running a web application on IIS that connects to a SQL Server database (on the same machine). Recently, I have noticed that there are a plethora of failed login attempts ...
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1answer
263 views

Security Audit on AWS - question on findings

Just wondering about an assessment I'm doing regarding a client's AWS environment. I'm new to AWS to I'm having to learn a lot on the go. I used ScoutSuite and got some findings, specifically: EC2: *...
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1answer
149 views

How can I encrypt messages sent over AWS PrivateLink?

I am working on a project where I need to send messages to a partner via AWS PrivateLink. Because these messages contain PII, the data needs to be secure. I have been unable to determine from internet ...
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0answers
27 views

Nmap showing different open ports every few seconds [duplicate]

I'm running Nmap on an Amazon Web Services EC2 instance but between runs just a couple seconds apart, I'm getting new results. Is this normal? I'm seeing open ports then they don't show. I'm running ...
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1answer
166 views

Windows Server: Import HSM-backed certificate into second server

Scenario: Using Amazon CloudHSM with CloudHSM Windows Client installed and configured. Created CSR for a Code Signing certificate with certreq.exe and provider Cavium Key Storage Provider. Submitted ...
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Communicating with things on AWS IoT without certificates problem

Is "IAM" access the only method to gain access AWS? I'm asking because I'm using AWS IoT. With AWS IoT we create things such as devices on AWS IoT Core. However, with IAM access, after creating a "...
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1answer
51 views

Explanation of the authentication procedure when using signed certificates [duplicate]

I am using AWS IoT with X.509 self-signed certificates for authentication. To communicate with the cloud I use MQTT. On my device side, I have a device certificate ( deviceCert.crt ) and the device ...
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What is Amazon's GDPR role with Alexa for Business Conferencing?

With respect to GDPR and the Alexa for Business conferencing solution, is Amazon acting in the capacity of a data controller or a data processor, or even a sub-processor? Here's some information on ...
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76 views

How to fix AWS security ALAS-2019-1149?

I need to investigate for the security hole ALAS-2019-1149(https://alas.aws.amazon.com/ALAS-2019-1149.html) which is report ed by AWS. I saw in the session "Issue Correction" Run yum update kernel to ...
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1answer
67 views

Should I take (Pen test) approval from AWS for Fuzz testing my Application API's hosted on AWS? [closed]

I wanted to Fuzz Tests my API's on my own stack which are hosted on AWS environment (Have used lambdas and API gateway) There are mostly GET APIs and only one PUT API.My requirement is to Fuzz Test ...
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1answer
70 views

Is there any harm to writing a short plain-text string to authorized_keys?

I have a CFN template where I'm seeding an authorized key for testing via paramaters, through a build server. If this value is not provided by the build job, it defaults to a short, plain text string, ...
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1answer
132 views

Is my server under some kind of reconnaisance/attack?

Recently, I started up nginx on an Amazon EC2 instance. After a day, I started seeing these messages in my log. Some client keeps trying to call /add and /health.html on my server. I don't have those ...
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278 views

Using Google Authentication with Lambda@Edge and S3 Static Sites

I am looking to set up authentication on an S3 hosted static site. The configuration is: S3 bucket configured to allow access via cloudfront AWS Cloudfront distribution with HTTPS configured and a ...
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2answers
256 views

Penetration Testing authorization from AWS

We have a few web applications newly hosted on AWS. Before we run an automated pentest on the our Application URL using Netsparker, we had always e-mailed Amazon and requested authorization for the ...
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2answers
116 views

Is AWS subnets enough for segregation of networks? or do we need VPC?

Is AWS subnets enough for segregation of networks with the all security groups? or do we need VPC to really issolate two application from each other?
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34 views

Anyway of finding connected devices on a vpn router from the VPN server itself?

I've setup my own OpenVpn server on AWS using an EC2 instance and I have a router with OpenWRT configured to connect to the VPN Server. Now, I want to have some EC2 running network scans such as NMAP ...
2
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1answer
45 views

What is the impact of leaving disabled root key on AWS instance?

I have a user which, when asked to create an IAM root user account, left the now disabled root key on the instance. When asked to remove the root key, he said it's disabled now so what's the ...
2
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1answer
58 views

What attack vectors does AWS SSE-S3 help mitigate?

Reading into the various SSE options on S3, I'm can't understand the following: What exactly does the SSE-S3 (fully-managed, transparent at-rest encryption) protect you against? I can only think of ...
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0answers
40 views

AWS SSM Agent protection

Our company is moving to the AWS cloud recently, and AWS relies a lot on the SSM agent, it is also opensource. ( https://github.com/aws/amazon-ssm-agent ) From my understanding, this agent is not ...
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2answers
193 views

AWS serverless architecture compliance with PCI DSS 11.3 penetration testing segmentation

I am wondering how to comply with PCI DSS requirements (11.3) to test segmentation controls using penetration testing in AWS serverless architecture. We are using components such as AWS Lambda, AWS ...
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1answer
104 views

How secure is SSL private key in AWS ELB service?

We host a cluster of microservices on AWS. The cluster has a public-facing gateway that uses an Elastic Load Balancer to terminate SSL traffic. The certificate is issued by AWS Certificate Manager (...
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1answer
36 views

Best practice for config files for ec2 instances

I am building a lamp server ec2 image for a project we are doing. These images will be in an autoscaling group and on startup will be running startup script. THere are some config files that have ...
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1answer
65 views

How secure is it to use port forwarding for VNC?

I am following this tutorial that explains how to use a VNC client to logon to an Amazon EC2 instance. After a few steps, it asks me to login to the instance using port forwarding using this command: ...
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59 views

What vectors and attack surfaces do we consider when creating an attack tree for applications hosted on AWS resources?

When illustrating an attack tree for web and mobile applications hosted on AWS resources what vectors do we include. To start out I can include taking over a sub domain using S3 and EC2. I have gone ...
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1answer
159 views

Getting scanned on AWS Elastic BeanStalk

As soon as I upload/deploy an application to AWS Elastic BeanStalk, it gets scanned for common admin pages even though it’s not linked to by any external website and I have not shared the DNS name ...
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37 views

Are there any additional security precautions I can or should take with my service?

Suppose I'm building a service to store all the secure or sensitive information that my other applications use. Think passwords, or private SSH keys. Under the old programming paradigm of 'do one ...
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1answer
96 views

unable to verify AWS EC2 Instance Identity Document with libressl

I'm trying to follow the steps here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html to verify an instance identity document, and I'm getting success when I ...
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1answer
166 views

envelope encryption (using KMS) vs ECDH

at work I have implemented basic envelope encryption when sending messages to a client. I am using AWS KMS and have a master key there. I get a data key, encrypt the message with AES-GCM and send the ...
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1answer
236 views

AWS Load Balancer Response Header Apache Server Disclosure

I have a node.js environment deployed using AWS Elastic Beanstalk on an Apache server. I have run a PCI scan on the environment and I'm getting 2 failures: Apache ServerTokens Information Disclosure ...
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1answer
999 views

Is this the correct way to use AWS Cognito?

I am doing the following in my React/Node App: Using the User Pools for a Cognito App that I have created Calling the /login endpoint with response_type=token in my React App Once I receive the JWT ...
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67 views

Meltdown checker says AWS and Rackspace is vulnerable - Why?

Today I was curious how my vmware environment stacked up against Spectre and Meltdown. So I ran spectre-meltdown-checker. It came back clean with 7 of 8 variants OK (the failed one is apparently ...
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1answer
44 views

What is needed to secure a docker container that's running on nodes in an AWS Private Subnet with internet access only via NAT?

I know securing a container is a big deal and a lot is needed to be done to secure a default container configuration. But having it in a private subnet should take care of a lots of risks. So what ...