SMBGhost Vulnerability (CVE-2020-0796) (2024)

Vulnerability

The SMBGhost affects the latest version of the Server Message Block (SMB) protocol.

SMB is a Windows service which is used for remote file and printer sharing. This vulnerability is caused by incorrectly handling the data compression in the protocol.

This could allow an attacker to get remote access to the vulnerable system or can crash the server. SMBGhost gets affected on both the SMB server and the SMB client.

So the attacker can either get access to the vulnerable SMB services or cloud setup by their own malicious server and compromise servers connected to it by convincing unsuspecting users to connect.

Affected Operating Systems:

  • windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 for x64-based Systems
  • Windows 10 Version 1909 for 32-bit Systems
  • Windows 10 Version 1909 for ARM64-based Systems
  • Windows 10 Version 1909 for x64-based Systems
  • Windows Server, version 1903 (Server Core installation)
  • Windows Server, version 1909 (Server Core installation)

Impact

If the attacker can make a successful exploitation, either the server crashes or gets a remote session to the vulnerable machine.

Mitigation Or Precaution

We recommend mitigating SMBGhost by patching all devices as per the Microsoft advisory.

Also, avoid the exposure of the SMB service discovery to the external connection by the firewall policies. There is also a workaround by disabling the SMBv3 compression.

You can disable the SMBv3 compression by the PowerShell command below:

 Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" DisableCompression -Type DWORD -Value 1 -Force 

You can disable the workaround by the PowerShell command below.

 Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" DisableCompression -Type DWORD -Value 0 -Force 

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Written by

SMBGhost Vulnerability (CVE-2020-0796) (1)

Prathap

Co-founder, Director

SMBGhost Vulnerability (CVE-2020-0796) (2024)

FAQs

What is CVE-2020-0796 vulnerable? ›

CVE-2020-0796 is a remote code execution vulnerability in Windows Server Message Block 3.1. 1 (SMBv3). An attacker who successfully exploited the vulnerability can gain the ability to execute code on the intended server or client. Alibaba Cloud has synchronized this update to the Windows system update source.

What is SMBGhost vulnerability? ›

Vulnerability. The SMBGhost affects the latest version of the Server Message Block (SMB) protocol. SMB is a Windows service which is used for remote file and printer sharing. This vulnerability is caused by incorrectly handling the data compression in the protocol.

What is the CVE number for SMBGhost? ›

SMBGhost - An Overview of CVE-2020-0796.

What is netlogon elevation of privilege vulnerability over smb zerologon CVE 2020 1472? ›

Tracked as CVE-2020-1472 the exploit occurs when establishing a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol. Exploitation of this vulnerability could allow a malicious actor with local network access to escalate privileges to a domain administrator level.

What is the score of CVE 2020 0796? ›

CVSS scores for CVE-2020-0796
Base ScoreBase SeverityExploitability Score
7.5HIGH10.0
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
10.0CRITICAL3.9
1 more row

What SMB is vulnerable? ›

The first version of the protocol – SMB v1 – was full of vulnerabilities that could be easily exploited. Today, the updated protocol is more secure, but SMB v1 exploits continue to happen because many machines still use the old and much more insecure protocol.

What is a CVE threat? ›

CVE stands for Common Vulnerabilities and Exposures. CVE is a glossary that classifies vulnerabilities. The glossary analyzes vulnerabilities and then uses the Common Vulnerability Scoring System (CVSS) to evaluate the threat level of a vulnerability.

What are the three 3 types of network service vulnerabilities? ›

Network security vulnerabilities involve three broad categories:
  • Hardware.
  • Software.
  • People.

What is SMB Pathname overflow vulnerability? ›

FAQ for SMB Pathname Overflow Vulnerability - CVE-2010-0020

This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

What is the CVE ID for this specific vulnerability? ›

A CVE Identifier is a unique number assigned to a specific security vulnerability, formatted as CVE-[Year]-[Number]. Assigned by CVE Numbering Authorities (CNAs), these identifiers help standardize the tracking and management of vulnerabilities across the cybersecurity community.

What is network security vulnerability scan? ›

Vulnerability scanning is the process of identifying security weaknesses and flaws in systems and software running on them. This is an integral component of a vulnerability management program, which has one overarching goal – to protect the organization from breaches and the exposure of sensitive data.

What is BlueKeep vulnerability? ›

BlueKeep is a software vulnerability affecting older versions of Microsoft Windows. Its risk is significant because it attacks an operating system's Remote Desktop Protocol (RDP), which connects to another computer over a network connection. This would allow a cyberthreat to spread very quickly.

What is netlogon vulnerability? ›

The flaw in Netlogon allows an unauthenticated attacker on an internal network to connect to the domain controller and set a new computer password. The attacker can then use this new password to take over the domain controller and, from there, gain control of the Windows network.

What is secondary logon elevation of privilege vulnerability? ›

Description. An elevation of privilege vulnerability exists in Microsoft Windows if the Windows Secondary Logon Service fails to properly manage request handles in memory. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator.

What is suspected netlogon privilege elevation attempt? ›

This vulnerability allows an attacker to escalate privileges to a domain administrator level by exploiting a flaw in the Netlogon Remote Protocol. Microsoft Defender for Identity can detect attempts to exploit this vulnerability.

Is CVE a vulnerability? ›

CVE stands for Common Vulnerabilities and Exposures. CVE is a glossary that classifies vulnerabilities. The glossary analyzes vulnerabilities and then uses the Common Vulnerability Scoring System (CVSS) to evaluate the threat level of a vulnerability.

Which vulnerabilities qualify for a CVE? ›

There are certain criteria to be satisfied to assign a CVE ID to a vulnerability:
  • The vulnerability should have a negative impact on security.
  • The vulnerability can be fixed independently.
  • The vulnerability impacts only one product. (It will get a separate CVE ID if it affects more than one.)
Jul 22, 2024

What is the CVE 2020 8899 exploit? ›

An unauthenticated, unauthorized attacker sending a specially crafted MMS to a vulnerable phone can trigger a heap-based buffer overflow in the Quram image codec leading to an arbitrary remote code execution (RCE) without any user interaction.

What is the CVE 2020 0688 vulnerability? ›

Description. A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.

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