The attack requires the attacker to physically touch or manipulate the vulnerable system. Physical interaction may be brief (e.g., evil maid attack1) or persistent. An example of such an attack is a cold boot attack in which an attacker gains access to disk encryption keys after physically accessing the target system. Other examples include peripheral attacks via FireWire/USB Direct Memory Access (DMA).
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.
Below is a copy: Backdoor.Win32.XLog.21 / Authentication Bypass Race Condition
Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/2906b5dc5132dd1319827415e837168f.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.XLog.21
Vulnerability: Authentication Bypass Race Condition
Description: The malware listens on TCP port 5553. Third-party attackers who can reach the system before a password has been set can logon using default credentials of noname/nopass and run commands made avail by the backdoor including changing the password therby potentially locking out the original intruder.
Incorrect username "victim|pass" we get
Received invalid name parameter!
Incorrect password "noname|pass" we get
Received incorrect password from client!
Sending correct noname|nopass creds we get no error. Next, we must send valid cmds using correct pipe delimiter or we will get "Received invalid parameter" errors.
push offset aCmdChangepass ; "cmd changepass"
004018EA mov edx, [ebp+Str1]
004018ED push edx ; Str1
004018EE call _strcmp
004018F3 add esp, 8
004018F6 test eax, eax
004018F8 jnz loc_4019A6
004018FE lea eax, [ebp+Delimiter]
00401901 push eax ; Delimiter
00401902 push 0 ; String
00401904 call _strtok
00401909 add esp, 8
0040190C mov [ebp+Str1], eax
0040190F cmp [ebp+Str1], 0
00401913 jnz short loc_401930
00401915 push offset aReceivedInvali_4 ; "\r\nReceived invalid parameter (NULL) f"...
0040191A mov ecx, [ebp+s]
0040191D push ecx ; s
0040191E call sub_4019D9
Family: XLog
Type: PE32
MD5: 2906b5dc5132dd1319827415e837168f
Vuln ID: MVID-2022-0543
Disclosure: 04/06/2022
Exploit/PoC:
from socket import *
import time
MALWARE_HOST="x.x.x.x"
PORT=5553
def chk_res(s):
res=""
while True:
res += s.recv(512)
break
if "\0" in res or "\n" in res or res == "":
break
return res
def doit():
s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
#Change the backdoors password so we PWN it!.
PAYLOAD="noname|nopass|cmd:changepass|malvuln"
s.send(PAYLOAD)
time.sleep(0.5)
#See whats the malware about
PAYLOAD="noname|malvuln|cmd:about"
s.send(PAYLOAD)
time.sleep(0.5)
print(chk_res(s))
#Terminate the backdoor
PAYLOAD="noname|malvuln|cmd:kill"
s.send(PAYLOAD)
time.sleep(0.5)
print(chk_res(s))
s.close()
if __name__=="__main__":
doit()
print("Malvuln")
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