this post was submitted on 16 Sep 2024
46 points (94.2% liked)
Privacy
31862 readers
269 users here now
A place to discuss privacy and freedom in the digital world.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
Some Rules
- Posting a link to a website containing tracking isn't great, if contents of the website are behind a paywall maybe copy them into the post
- Don't promote proprietary software
- Try to keep things on topic
- If you have a question, please try searching for previous discussions, maybe it has already been answered
- Reposts are fine, but should have at least a couple of weeks in between so that the post can reach a new audience
- Be nice :)
Related communities
Chat rooms
-
[Matrix/Element]Dead
much thanks to @gary_host_laptop for the logo design :)
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Because android. PostmarketOS is linux (based on alpine linux)
Interesting. I have a vastly divergent opinion on linux for mobile, mostly that it is not secure. This is true for Desktop linux but is more important considering the threat model necessary for mobile device Security.
Feel free to elaborate. Everything I have read over my life (couple thousand pages I guess) suggestd that linux can be a lot more secure than windows and ios.
Linux is not security hardened. It does not properly sandbox applications (and there is nothing as secure as android's sandboxing on linux). In fact, most linux package managers do not feature any sandboxing of applications, period. Linux does not implement verified boot. It does not harden against physical port attacks. It does not use a hardened memory allocator. Privilege escalation is simple because of how straightforward it is to compromise a wheel user (sudo user). Linux does not harden it kernel flags by default. Alpine (and most linux package managers) are not secure (aka does not pass the TUF threat model). Most linux distros dont feature a read-only root filesystem, which would help to improve security. Also, Systemd is a bloated init system and has a massive attack surface. GNU's tooling is also bloated and freebsd's would make a good alternative (like what is done by Chimera Linux)
Here are some readings on linux security:
Article by one of the Whonix Devs https://madaidans-insecurities.github.io/linux.html and also are hardening guide from them https://madaidans-insecurities.github.io/guides/linux-hardening.html
Wiki page of Whonix considering many linux distros for whether they make a good base for Whonix's security distro: https://www.whonix.org/wiki/Dev/Operating_System#Alpine_Linux
Kicksecure's wiki: https://www.kicksecure.com/wiki/Documentation
Here are some Security hardened distros (Note that none meet the threat model for a mobile phone OS as they dont feature verified boot):
https://www.kicksecure.com
https://github.com/secureblue/secureblue
https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/profiles/hardened.nix.
Special mention which isnt hardened but has great potential: https://chimera-linux.org/
You do realize that this is bullshit, right?
Its typical fearmongering (in fact the same article too) that I have been sent a ton of times by low tech users that fanboy for graphene.
There is no such thing as „physical port attacks“. It also works very different on phones then on computers. You can for example use i2c on an iphone to crack it open which somewhat straightforward to do but still has zero implications for daily use. The linux apps are desktop apps and as such dont have any chance to get through all of the open source community‘s eyes undetected.
Its a completely backwards take that assumes using bad faith software written in the dark by proprietary vendors which just isnt real.
I only mentioned physical port attacks in a much larger list of things Linux MUST improve on. I am not a grapheneOS shill, nor did any of the supporting articles I sent relate to GOS, so I don't really understand your response. Read through the links I posted and learn more about the operating system you use. I am NOT saying linux is dogshit, I very much love linux. Why not just educate yourself on this topic instead of assuming things from a place of ignorance or constructing a strawman. I spend multiple hours per day reading and putting into practice Linux hardening techniques, I am not just working with a surface level understanding of Linux security.
Even open source is vulnerable. Two questions: do you examine all the commits on every app you use? Do you compile every update to the apps you use from source? Sandboxing is important because if an application is compromised it cant lead to privilege escalation or userspace spyware.
I‘m not that bad at rhetoric either but I avoid it when I can.
Your argument is empty. Privilege escalation attacks are plain old cves that get found, evaluated and fixed. You need access to the phone, mostly in an unlocked state to get anything to work like that, same as with a computer.
I know a couple of pen testers and I would definitely know if there were large differences between operating systems securitywise.
CVEs are often go mislabeled as normal bugs and dont get the attention needed. It also may take a bit for such vulnerabilities to make it downstream.
A simple privilege escalation attack on basically every system goes as follows: add a function into the bashrc file of a users that runs a script, have the script intercept the users sudo credentials and pass the command on normally as if it was just the regular sudo command. Now you have root. Nothing here requires priveleges beforehand. Anything, be it a script, appimage, malicious binary, etc can follow those steps and gain root access by compromising the wheel user. Even without compromising a user, it could simply add a Systemd user service that keylogs (keylogging is still possible on Wayland without security hardening)
A prerequisite of course is getting that file onto the user's computer. There are a plethora of ways. Simplest way is to learn what applications the user installs, find the weakest link, and compromise them.
There are of course much more sophisticated and better ways, some of which are detailed in the supporting links I sent. Every Security expert and researcher I have talked to can recognize that Linux has an outdated security model. The best links to read would be the hardening guide and "linux isnt secure".
I did quite some reading in my time, as I mentioned. The methods you are describing are riddled with ifs and buts. The reality is that even online systems arent hacked if they dont have obvious flaws like passwords in root ssh. on the other hand tools like john the ripper can break each and every common encryption given the right circumstances. Its no difference. Its all just marketing.
Neither of the methods I mentioned are hard. They have no 'if's or 'but's, only the same prerequisite as any bit of malware, get run. Do you know how to protect against either of the attacks I mentioned? You can poke some holes in them if you like.
The attacks I mentioned (and even more in the articles and wiki's for the "Security focused linux distros" I shared) are often not possible on Windows or OSX because of the hardening present on basically every other modern OS. Linux just makes it easy. I don't really understand what you mean by "I did a lot of reading in my time", Security research is continuous and you can never get to a point where you understand everything or anything. I learn new things everyday, I suggest you expand your horizons and learn more about the topic you have such confidence in. Nothing that I shared is a long read, there are no tricks and I am not trying to tell you to stop using Linux mobile. Just that it isn't "secure", or more specifically it isnt as secure (out of the box or even with moderate hardening) as OSX/Windows/BSD/Android. Default Linux IS more private than any closed source systems, but when compared to other open source OSes like DivestOS (deblobbed hardened AOSP), Kicksecure (Debian Linux), Secureblue (Fedora Atomic), or hardened BSD, it is missing out on a lot of necessary hardening policies/changes.