Questions tagged [security]

For more generic questions relating security issues. For specific issues having their own tags, please use those -- e.g. 'malware', 'antivirus', 'privacy', 'lost-phone'. Please see the full tag wiki for more. For more in-depth Android security issues, you might rather want to visit our sister-site at http://security.stackexchange.com/questions/tagged/android

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Do Google & OEMs always have backdoors in Android devices?

In a helpful comment on this Android Stackexchange question, prominent contributor alecxs states: google and OEMs will always have own backdoors in propritary [sic] blobs for baseband/modem etc - you ...
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IPC Binder Android [closed]

Is there a documentation that explains sys/kernel/debug/binder/transactions ?In particular I’m interested to know more details regarding to monitor binders
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Take front/selfie photo if wrong password is input on the lock screen

Operating systems like iOS include the system that when another person tries to unlock your phone without your permission, it takes a photo of that person and warns you. Is it possible to have this on ...
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Can installed apps access data on android storage in background

Will it be possible for an app to read data in the background if it has media access permissions or even full storage access permission? Assumptions: Android 11 and above Media and file storage ...
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How to prevent network connectivity after a phone restart before the NetGuard firewall starts blocking apps' traffic?

There seems to be a major vulnerability in Android: even when using firewalls these aren't active immediately after a restart. The seconds before the firewall (NetGuard) starts can be used by apps ...
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BRATA (Brazilian RAT Android) - is there any action and treatment from it?

As far as is known, with this virus, the attacker, in addition to stopping antivirus programs, can also block the system menu while working with it by the user. The virus copies system data and then ...
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Weird files inside the root folder

I previewed (not downloaded) by mistake today a malicious pdf on Gmail app with Adobe Reader app, and I already inspected the phone for malware, uninstalled Adobe Reader app in case it was exploited, ...
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"Auto Update: Security" apk in downloads section

I found an apk called "Auto Update: Security" in the downloads folder of my phone. I wasn't able to access its details as every time I tried to do so the package installer would start, with ...
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Can Android 12 update trigger "new access" notification?

I recently got an e-mail warning that an app has been granted access from a nearby location, just after updating to Android 12. Device used was "app" not web browser. I changed password and ...
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Do keyboard apps which are enabled but not selected have access to input text?

I installed a keyboard app on Android 6 and when enabling it, the OS showed a warning that the keyboard app has access to input text. Since the warning appeared on enabling, not selecting, this ...
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How is an APK prevented from making security changes during their installation process

What if the APK installation ran a few scripts? Overwrote files outside it's designated folder? Edited a few files? etc? What would prevent it from doing so?
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Prevention of Android devices being hacked

I keep seeing media articles saying that smart phones etc are being hacked, particularly by NSO Pegasus. I would like to know how this is done. I'm particularly interested in how to protect against it....
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How to find hidden malware on Android?

Today, while watching a YouTube video on my Samsung Galaxy S20 FE 5G, the left half of the video portion was covered with a pinkish/orangish screen with the words "MICROWAVE SPY CAMERA 1.XXXX&...
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Can we get any data from fingerprint? [duplicate]

Is it possible to get a hash from a fingerprint reading such that it proves the identity of a user on my app and such that I can export the hash? By export I mean to put it on a document as proof of ...
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Disable "PIN required for additional security" prompt

I have a Pixel 4a, and I constantly have to re-enter the pin, even though it hasn't been more than 48/72 hours. My Pixel 4a currently has a pretty bulky case, making it unreasonable that the ...
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What info/data can a fresh installed app without permission gather?

If I just install an app BUT DON'T OPEN it, can it do/get something? Maybe during installation process, even if I didn't open it yet? If I didn't give the app any permission, what can it do/know? Can ...
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Can an app be installed AUTOMATICALLY and SILENTLY without popup/confirmation of install? How can this be possibile?

Is this behaviour doable? How? I have an app which keeps reinstalling. How can I track what is causing the installation? Are there any logs that I can check to see what is really causing this to ...
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There's this app that keeps installing automatically from Google Play Store

The app itself is a bank app. It's also a famous bank (Relax Banking by BCC).. The notification says installed from Play Store, and if I open Play Store and go to the page app, says in fact installed.....
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Are the Android app switcher/multitasking snapshots created when an app is sent to the background, encrypted?

This post here: https://android.stackexchange.com/a/218963/364009 outlines the snapshots location for the app switcher when an app is sent to the background, /data/system_ce/userid/snapshots, or at ...
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How to read html on my sdCard

A new tablet with Android 11. I have a collection of linked html pages; offline. There are quite a few and I would prefer to store these on my sdCard. Using file manager I click the index.html and it ...
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Update linking path

How do I add a new directory to linking path? Meaning add a directory to where the dynamic linker will look for shared libraries. In Ubuntu you can create a .conf file under /etc/ld.so.conf.d and ...
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Android hidden account

Is there any way to create hidden account in Android as it described in Cory Doctorow book "Little Brother"? When I enter pin code like 1234 this will open first account. When I enter 5678 ...
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Could anyone identify this crDroid ROM?

Found some third-party crDROID 7.11 build that works flawlessly on my phone, g530FZ. However, I couldn't find it listed on any credible sources (such as XDA). Anyone else used this rom or saw any ...
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Security concern: Can "multiple user" feature protect my sensitive data from apps that I don't trust? [duplicate]

I'm using lineageos18.1 and for some reason I need to install an app that I don't trust. It requires some critical permission to run normally such as: All files access Install unknown apps Get ...
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How is it possible to hack/steal the data of a stranger's Android phone by holding it by hand for a while?

Several years ago, I saw in my university a demonstration that someone wearing a special finger ring can transfer the data of a stranger's (Android) phone to somewhere without the owner of the phone ...
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How do I shuffle the keypad when typing a PIN?

I just moved to Android from Cyanogen, but I noticed the keypad doesn't shuffle when unlocking the phone. The numbers always show up in the same place, as in a physical phone. How to I configure ...
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How do I hide the dots that show up when I type my password?

In my new Android phone I see dots when I type the PIN. How do I hide the dots? I don't want people to know how long my PIN is.
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Block URLs from Android Webview [duplicate]

I am looking for a solution to block all URLs except a few which are required for my device to function. I have all the root permissions required to make changes. Is there any way we can block all ...
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Recursive bind mount not working android x86 7.1.1

I have 3 directories: a, b and c. Directory 'a' contains the subdirectories '1' and '2', and these sud-directories both contain files 'foo' and 'bar'. Directory 'b' also has subdirectories with the ...
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Is it safe to delete a .bin file on an Android 11 phone?

I keep getting .bin files that show zero data in them and others that pop up regularly. Is it safe to delete them? Do they contain any vital information. Are they remnants of sites I've visited using ...
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If I enable adbd LAN tcp 5555, does it mean any app or LAN device can connect port 5555 to get a shell permission?

I have a Android 8 TV box. In developer settings, I can enable/disable USB debug. After enable, any device in LAN can use adb connect <ip> to connect to (no password or auth required) and ...
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Is it possible using Yubikey as a login authenticator on lock screen?

This question was already well asked and answered in the negative back in 2017 (see at bottom). However, as I'm about to purchase an Android phone, I'm hoping things have changed. I'm a newbie to ...
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How to load android shared libraries

How does Android load /system/lib/*.so libraries? How does the system knows what file is for what purpose. Is there a database or list of expected.so files and their functions?
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What are the risks of allowing an app the "Draw over other apps" permission?

There's an app I'd like to install on my phone (Android 12) that blocks access to distracting apps. It requires the "Draw over other apps" permission. This seems like a dangerous permission, ...
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How do you configure secure DNS (aka "private DNS") with cloudflare?

note: there are a lot of DNS questions on android.stackexchange.com I'm creating this question because all the other DNS questions were for different scenarios and I wanted to keep this up to date ...
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Is it possible to make Android device connect only a specific Wifi network?

i want to know if it is possible to restrict an Android device to connect wifi networks expect one specific network. Scenario is: An app will be installed to the Android device and then device will be ...
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Can we get single time access to in-display fingerprint photos in android?

I am trying to access the fingerprint photo access from the in-display fingerprint sensor for a specific use case. Is it possible to do so?
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Allow access to tablet data security dialog box

I have been given the task to get some android tablets (SM-T500) working in kiosk mode (soti mobicontrol). The issue is when they are in kiosk mode it blocks the USB switcher menu and the allow access ...
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contents of data partition in android

does anyone know what all content is stored in /data or userdata partition in android-10. I see a lot of directories in /data like app-staging, misc, system, vendor. what information is stored in ...
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Enable Remote unlock from the Settings via ADB (no root)

I am trying to enable the Setting "Remote unlock" from Samsung (in Settings -> Biometrics and security -> Find My Mobile -> Remote unlock) by using the adb. I could enable other ...
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On which Android versions was it usual for apps to ask, inside own window, for password of app of other legal entity?

When i tried to open my Whatsapp chats from web browser on laptop, and wanted to scan a QR code from Whatsapp on my smartphone, Whatsapp asked for password, indide the same Whatsapp window. As i have ...
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What data is still left after factory reset?

I have an unlocked Xiaomi Poco X3 (surya) and I got banned in Jodel. The app doesn't have many permissions, but somehow the App recognize me even after a factory reset. On every new instance I only ...
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How do I give an app full access to an SD card without really giving full access?

There's an app that needs full access to my SD Card to work. It will not just let me select the folder it will use. It says that "need full access to the SD Card". But this app is supposed ...
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Which way of asking for SIM PIN is correct?

I have two Android phones. Both have SIM cards with PINs set, but their behavior is oddly different: The one with Android 4.4.2 asked for SIM PIN only once - the first time I installed the new SIM ...
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Encrypted device doesn't ask for credential on boot anymore on Android 11

I use Android 11 (LineageOS) and recently noticed, that my phone stopped asking me for a decryption password when booting up, so I tried verifying that my data is still actually encrypted. Settings ...
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65 votes
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Does the Log4j vulnerability affect Android users?

The new vulnerability CVE-2021-44228 (also known as Log4Shell) is wreaking havoc, but very little of the discussion is voiced about the average android user. Is the average Android OS user at risk? I ...
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Switch password by day on Android?

I like to put overly complicated passwords on my phone (currently it has 16 numbers). Is there a way to make the password switch by day? Like every Monday it would be "1234" and Tuesday &...
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Questions Before I Sell My Phone (Too Late To Encrypt Drive?)?

I'm pretty strapped for cash and I need to sell my phone (Motorola Moto G7, Android 10). However, there are some... sensitive... photos of myself on it that I'm not suuuper comfortable with the next ...
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3 votes
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How to verify if device is reporting fake technical specs like Android version, RAM, or storage memory?

I've been asked if I can check some faulty behavior of a device, a cheap Chinese android smartphone. I'm not really an android expert, usually I install a few apps to help me figure out few things ...
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What are the limits/powers of android device policy?

I work in a university and when we want to login in our university email id, we go to gmail So we can also use our official email for creating account on android,but when i try to create account using ...
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