How to check if smb signing is enabled

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Description

Signing is not compelled on the remote SMB server. An unauthenticated, remote attacker deserve to make use of this to conduct man-in-the-middle attacks against the SMB server.

You watching: How to check if smb signing is enabled

Solution

Enpressure message signing in the host’s configuration. On Windows, this is discovered in the policy setting ‘Microsoft network server: Digitally authorize interactions (always)’. On Samba, the establishing is referred to as ‘server signing’. See the ‘check out also’ web links for further details.

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See Also

https://assistance.microsoft.com/en-us/kb/887429

http://technet.microsoft.com/en-us/library/cc731957.aspx

http://www.nessus.org/u?74b80723

http://www.samba.org/samba/docs/man/manpages-3/smb.conf.5.html

http://www.nessus.org/u?a3cac4ea

Fix for Windows

Connumber the Group Policy ‘Microsoft network-related server: Digitally authorize interactions (always)’ to ‘Enabled’

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Or run the following command also to change the registy key:


REG ADD "HKLMSystemCurrentControlSetServicesLanManServerParameters" /f /v "requiresecuritysignature" /t REG_DWORD /d 0x1

REG ADD "HKLMSystemCurrentControlSetServicesLanManServerParameters" /f /v "requiresecuritysignature" /t REG_DWORD /d 0x1


Or using Powershell


set-SmbServerConfiguration -RequireSecuritySignature $TRUE -force

set-SmbServerConfiguration -RequireSecuritySignature $TRUE -force


Verify

You deserve to verify the setting via Powershell:


Get-SmbServerConfiguration | select RequireSecuritySignature

Get-SmbServerConfiguration | select RequireSecuritySignature


References

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This enattempt was posted in Hardening, Nessus, Vulnercapacity Scanning, Windows on August 23, 2016 by webmaster.

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