Questions tagged [docker]
Docker is a popular virtualization solution that provides virtualization within an operating system for reusable packages of software called containers. More information available at docker.com.
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docker daemon reports 'tls: unconfigured cipher suite' for Nginx reverse proxy of Artifactory Docker registry
I am migrating to Artifactory on RHEL8 as a Docker remote repository, i.e. Artifactory is a proxy for a docker registry hosted through Jfrog.io.
We have a legacy registry with config in /etc/docker/...
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The safest and fastest way to upload files in Docker Container
In a docker project of Asp.net Core MVC 6.0, users must upload files to wwwroot of the project but nothing checks to see if the file is safe or not.
I check file extensions with my file header library ...
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2 network tunnels from 2 providers to 1 machine running docker, will this expose all containers on both tunnels?
I have a server running multiple docker containers, accessible through tunneling.
I want to create a new tunnel that is separate from the one I already have. Will the new tunnel service interfere or ...
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Is deploying a web application to a customer's encrypted drive a secure solution against code theft?
I have developed a web service for customer. The web service is written in Python and running in Docker containers. It is managed by docker compose.
The customer wants my web service to run on their ...
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Can OpenSSL vulnerabilities be mitigated by Load Balancer service from Cloud Providers
We have a service running as a container for which there some reported vulnerabilities in OpenSSL. Our service is behind the Application Load Balancer, which ideally should terminate the traffic at ...
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Can kubernetes pods in the same or different namespace sniff the packets of other pods?
Since the pods share the same subnet, is it possible that one pod can sniff the network packets of other pods? Please explain the reason.
Note: I created 3 pods in the same namespace, on one pod I ran ...
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154
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Risks from usage of CHROOT inside a Docker container
Can --cap-add SYS_CHROOT on a docker container be questioned as a potential security risk, and why?
I'm seeking references and information from security professionals about using the chroot tool (and ...
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Is it safe to run `docker load` on a potentially malicious archive generated by `docker save` which will later be run with the gvisor runtime?
The image loaded with docker load will be user submitted, and I may also add additional files to it (which could also be potentially malicious). A container will then be created based on the image, ...
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How do I prevent user from accessing docker image content?
I have a SaaS web application. One of my clients needs the app to be installed on his infrastructure (meaning physically on servers only they can access). The application stack is 2 docker images: one ...
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193
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Reverse proxy server in DMZ with separate server for nginx (docker)
Does it makes sense to create two separate docker hosts (VMs) for reverse-proxy and web application?
My first idea was to put the web-exposed application in my separated VLAN (DMZ) where only ports 80 ...
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"PUT /SDK/webLanguage HTTP/1.1" on a server with only port 22 open
I've recently spun on a new droplet on Digital Ocean with Ubuntu 22 and enabled UFW and allowed only SSH, which reports being active even after a reboot:
sudo ufw status
Status: active
To ...
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599
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Weird hack attempt nginx proxy manager and photoprism drives me nuts
I have a logged http request in nginx logs which drives me nuts because I don't understand how it's finding its way into the logs:
[03/Jul/2023:13:45:04 +0000] 400 - GET http localhost "/bin/...
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565
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Does a docker socket proxy improve security?
It's dangerous to expose the docker socket to a container, as malicious code could break out into the host. There are various ways to avoid this; a simple/popular approach is to use a proxy between ...
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Does it matter if my docker container image is rootless, if docker daemon is rootless (or uses UserNS-remap)?
You can and generally should (1) run docker daemon (or podman, or something else) as rootless, and/or (2) use user namespace-remapping, to improve security.
You can also (3) use rootless images, where ...
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Strategy for storing private keys used in an embedded device
I am developing an embedded device using a bootloader. This means that the device will store in its flash an encryption key for decrypting update packages and an ECC public key for verifying update ...
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Container Vulnerability Management for non-dev-organizations
Is there a good best practice for container vulnerability management when you are not a dev shop?
I am currently trying to figure out how to set up a proper supply chain risk management system for a ...
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Online Judge running on root [duplicate]
My college has a website which allows students to submit coding assignments by running them on an Online IDE which checks the output against several test cases.
I noticed by running system(“whoami”) ...
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93
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Are verified publisher docker containers safe?
I need to create a virtual machine that it stays up and running on my Synology NAS and it has to use a web browser where I need to insert some credentials.
I saw a downloadable firefox container ( ...
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587
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Reverse shell not working [closed]
I'm running a DVWA container on my kali VM using:
docker run --rm -it -p 80:80 vulnerables/web-dvwa
Network interface details:
Kali docker0 int: 172.17.0.1/16
Kali eth0 int: 192.168.1.233/24
DVWA ...
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178
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Can I run safely remotely downloaded docker images
I often pull and run a docker images from hub.docker.com
I am running with this command:
docker run --it xxx/image /bin/bash
I never share volumes (with -v option) for example.
Let's suppose a ...
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153
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What is the most secure way to transfer untrusted data between containers?
Let's suppose we have two containers running on a linux box and one has untrusted user data that the other needs to process. What is the most secure way to transfer this data? Is it better to write ...
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265
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Why am I able to access EC2 metadata endpoint from within a Docker container running in the EC2
My understanding of containers is very basic and so is my understanding of AWS EC2. Recently while trying to debug a security issue, I came across a scenario where I was able to gain an RCE. Whether ...
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Authenticating a request from a valid application (unshadowed)
I am working on an application which has an architectural description as below,
There is a docker container, lets say Microservice-A, in which multiple processes are running. Each process is ...
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2
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1
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123
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Is it safe to use Python's secrets module in a fresh docker container?
If I create a new Docker container based on a recent Debian image, and if use this container to generate a cryptographic key using Python's secrets module, then is that key safe to use?
My ...
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209
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How do you share private keys for signing e.g. JWTs inside Docker-Containers?
I've written an application in NodeJS which essentially only performs a login:
You send your username/password, and you retrieve an JWT (JSON Web Token).
Those tokens are being signed by a private key....
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3
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1
answer
691
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Docker Apache - safe to chown /usr/local/apache2 to non-root user?
I would like to run the official Docker Apache image as a non-root user. To make it work, it seems like it is necessary to chown the /usr/local/apache2 directory (see this and this):
chown -hR appuser:...
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75
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ZipSlip directory traversal cannot reach root directory
I have discovered a ZipSlip vulnerability in a web application. Simply put, ZipSlip is basically a directory traversal through a specially crafted zip file, which is made to contain "../" ...
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2
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166
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Does AWS security group block unintentionally exposed ports from Docker?
My typical cloud server hardening includes blocking ports at the UFW level on the server as well as at the AWS security group level.
I recently learned that Docker overwrites your IPTables. Given that,...
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255
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Is better for security to not run Nginx and Backend inside docker but use docker only for database and not external exposed services?
I'm not a Docker specialist, I know how to install, configure and do only basic Docker hardening based on Docker official documentation.
I know nothing about AppArmor,SELinux and GRSEC.
But i need to ...
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How do you control restrict actions within Docker without Kubernetes?
Based on the documentation here https://docs.docker.com/engine/security/, it does not seem that there are any built-in features to restrict the current logged-in user to run certain Docker commands.
...
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What is the easiest way to find non-vulnerable container images?
I am fairly new to container image vulnerability scanning. There seem to be a lot of tools (Snyk, Trivvy, Clair, e.g.) that can identify vulnerable packages in container images. They also do a good ...
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Can a container with CAP_NET_ADMIN access the host namespace
I have a docker container that I run by adding the extra privilege of CAP_NET_ADMIN in addition to the default ones. If I don’t share the host net namespace with the container, the host namespace is ...
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210
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Docker container can't access systemd service because of firewall
I'm in a somewhat weird situation that I don't understand:
I use ufw as a firewall. It's setup to drop any input connections apart from ssh
I have a service running locally (managed through systemd) ...
- 157
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2
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188
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Docker, running programs as Root and AWS
It is well known that running programs inside your docker container as root is bad practice. As far as I can tell, the reason for this is because root on the container is rather similar to root on the ...
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Why I am unable to execute insmod on the docker container?
I have started an unprivileged docker container and trying to start the privileged exec session. It has CAP_SYS_MODULE capabilities, but still, I am getting operations not permitted in insmod.
docker ...
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/opt and sudo unzip to /opt, is it safe?
Usually we place things in /opt so they are owned by root but normal users can execute them. This prevents normal users modifying the binaries so they cannot execute arbitrary stuff. However, to put ...
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Security of a ro volume in Docker
What are the security implications of mapping a host folder to a Docker container ro? For example -v /usr/local/bin:/usr/local/bin:ro.
Of course, the container can now read the host folder. But, ...
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How does gVisor run its own kernel replacement under Docker for security? [closed]
I learned about gVisor from https://security.stackexchange.com/a/259275/133925 . It runs containers under a custom kernel, written in Go, with very intense security.
My question is: The whole point ...
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554
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Security of untrusted Docker containers
If I want to run untrusted code inside a Docker container, or an untrusted Docker container for that matter, how can I restrict it?
I'd like to make sure it has no access to the host filesystem. ...
- 267
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72
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Security implications of using HTTP for service to service communication within the same host [duplicate]
What are the security implications of using HTTP only for IPC for services within the same host?
In my case, I am using docker-compose to host two ASP.NET Core services within the same host in Azure.
...
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Getting apparmor to profile a program inside docker container
I'm looking to profile a service running inside a specific docker container. I went through the documentation of aa-genprof and aa-autodep and both take program as input to profile. I can't seem to ...
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Docker: How to download & verify a publisher's root key (out-of-band, distinct-domain cryptographic verification, WoT)
For a given publisher of docker images on Docker Hub (let's say debian), how do I download their root release/image signing key and verify its authenticity from multiple sources out-of-band from each-...
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361
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Why Vulnerability Scanners Ignore Shared Libraries?
First of all, I am new to vulnerability scanning and don't have an experience working with any tooling outside of container specific. So, I don't know if it is a normal behavior for scanners. Please ...
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60
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How to protect workload from host [duplicate]
I have some code and other resources which run in a container or VM ("black box") on a host machine. The host uses this as a service to process some files which are highly sensitive and ...
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How can I pass secrets to a compromised container without the attacker being able to see them?
The most common method of passing secrets to a docker container is through ENVs.
The problem is:
Imagine that your docker container is hosting a HTTP server that can have a security exploit (like any ...
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148
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Logging docker container logins, EC2 Host
I have an AWS EC2 instance with docker installed, running a default nginx container - docker run -it --rm -d -p 8080:80 --name web nginx.
I have an rsyslog setup that successfully captures the auth....
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535
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Kinsing Malware entering via compromised Dockerhub Images?
I got a server infected with the Kinsing malware, which mines crypto on your server, maxing out your CPUs.
The malware initially creates the files /tmp/kdevtmpfs and /tmp/kinsing If you delete these ...
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500
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Remediating base image vulnerabilities
I'm trying to build a base image that pulls from php:7.3-fpm, which is built on debian:buster-slim. The php:7.3-fpm base image has vulnerabilities out of the box, like https://security-tracker.debian....
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145
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Do I need to keep production Docker/container images?
Context
My company is developing a SaaS solution that needs to conform to PCI-DSS L1 for sure, and possibly FedRAMP and other frameworks later.
We can do continuous deployment with feature flagged/...
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776
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How to secure containerized python source code deployed at client side cloud
How can we secure a source code which is deployed at client side cloud and is difficult to reverse engineer just like a licensed product The major difference is that I have a service to protect and do ...
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