Impacket smb relay

1. What is an SMB relay attack?
2. Which vulnerability does SMB relay exploit?
3. How does NTLM relay work?
4. Is SMB an exploit?
5. Is SMB a security risk?
6. Can a hacker still damage a network using SMB?
7. Is SMB more secure than FTP?
8. Why is SMB unsafe?
9. What is NTLM SMB?
10. Can NTLM be cracked?
11. Is NTLM still in use?
12. What is an SMB vulnerability?
13. How does relay attack work?
14. What does SMB mean in cyber security?
15. What is a relay attack cyber?
16. Can a hacker still damage a network using SMB?
17. Is SMB port 445 secure?
18. Does SMB work without Internet?

What is an SMB relay attack?

SMB Relay Attack is a type of attack which relies on NTLM Version 2 authentication that is normally used in most companies. Unfortunately, when we are listening to what is going on in the network, we're able to capture a certain part of the traffic related to the authentication and also relay it to the other servers.

Which vulnerability does SMB relay exploit?

The SMB Relay attack abuses the NTLM challenge-response protocol. Commonly, all SMB sessions used the NTML protocol for encryption and authentication purposes (i.e. NTLM over SMB).

How does NTLM relay work?

NTLM is a protocol that uses a challenge and response method to authenticate a client. First, the client establishes a network path to the server and sends a NEGOTIATE_MESSAGE advertising its capabilities. Next, the server responds with CHALLENGE_MESSAGE which is used to establish the identity of the client.

Is SMB an exploit?

The SMB vulnerability can let an unauthorized attacker to run any code as part of an application. According to the Microsoft advisory, “To exploit the vulnerability against an SMB Server, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv3 Server.

Is SMB a security risk?

Leaving an SMB service open to the public can give attackers the ability to access data on your clients' internal network, and increases their risk of a ransomware attack or other exploit.

Can a hacker still damage a network using SMB?

SMBv1 has a number of vulnerabilities that allow for remote code execution on the target machine. Even though most of them have a patch available and SMBv1 is no longer installed by default as of Windows Server 2016, hackers are still exploiting this protocol to launch devastating attacks.

Is SMB more secure than FTP?

The security of SMB can be problematic when connected to the internet or web as it is prone to cyber attacks. On the contrary, FTP offers a secure file transfer ecosystem that keeps your data protected and can be accessed using a user and password.

Why is SMB unsafe?

Security concerns

The SMBv1 protocol is not safe to use. By using this old protocol, you lose protections such as pre-authentication integrity, secure dialect negotiation, encryption, disabling insecure guest logins, and improved message signing.

What is NTLM SMB?

NTLM is a challenge/response style protocol used in Windows for authentication between clients and servers. It's used by application protocols that require user authentication or session security, such as HTTP, SMB or SMTP. The NTLM messages are embedded in the packets of those application protocols.

Can NTLM be cracked?

Windows 10 passwords stored as NTLM hashes can be dumped and exfiltrated to an attacker's system in seconds. The hashes can be very easily brute-forced and cracked to reveal the passwords in plaintext using a combination of tools, including Mimikatz, ProcDump, John the Ripper, and Hashcat.

Is NTLM still in use?

NTLM authentication is still supported and must be used for Windows authentication with systems configured as a member of a workgroup. NTLM authentication is also used for local logon authentication on non-domain controllers.

What is an SMB vulnerability?

This vulnerability allows an attacker to execute code on the target system, making it a serious risk to affected systems that have not been patched. Between older systems that are either unpatched or unable to receive further security patches and newer vulnerabilities being found, SMB is a viable target for attackers.

How does relay attack work?

How does a relay attack work? A relay attack usually involves two people working together. One stands by the targeted vehicle, while the other stands near the house with a device that can pick up a signal from the key fob. What's more, some devices can pick up a signal from over 100 metres away.

What does SMB mean in cyber security?

What is the Server Message Block protocol? The Server Message Block protocol (SMB protocol) is a client-server communication protocol used for sharing access to files, printers, serial ports and other resources on a network. It can also carry transaction protocols for interprocess communication.

What is a relay attack cyber?

In a classic relay attack, communication with both parties is initiated by the attacker who then merely relays messages between the two parties without manipulating them or even necessarily reading them.

Can a hacker still damage a network using SMB?

SMBv1 has a number of vulnerabilities that allow for remote code execution on the target machine. Even though most of them have a patch available and SMBv1 is no longer installed by default as of Windows Server 2016, hackers are still exploiting this protocol to launch devastating attacks.

Is SMB port 445 secure?

Avoid Exposing SMB Ports

‍Ports 135-139 and 445 are not safe to publicly expose and have not been for a decade.

Does SMB work without Internet?

SMB works on local network, not Internet (WAN)…so being connected or not to Internet should make no difference.