Reauth after STATUS_NETWORK_SESSION_EXPIRED #292
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cdelafuente-r7 merged 2 commits intorapid7:masterfrom Mar 24, 2026
Merged
Reauth after STATUS_NETWORK_SESSION_EXPIRED #292cdelafuente-r7 merged 2 commits intorapid7:masterfrom
cdelafuente-r7 merged 2 commits intorapid7:masterfrom
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lib/ruby_smb/client.rb
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| # to re-authenticate, which makes relaying ntlm authentication to multiple targets possible. This block ensures | ||
| # ruby_smb behaves in the same manner as 'net use'. | ||
| if smb2_header && smb2_header.nt_status == WindowsError::NTStatus::STATUS_NETWORK_SESSION_EXPIRED | ||
| session_setup(self.username, self.password, self.domain, local_workstation: self.local_workstation, ntlm_flags: NTLM::DEFAULT_CLIENT_FLAGS) |
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We'll want to test what happens here if the authentication mechanism is Kerberos. If it can't proceed and we received a STATUS_NETWORK_SESSION_EXPIRED then raising that as an exception (which it might already do, I haven't checked) would be a good idea.
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Mar 23, 2026
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Thank you @jheysel-r7 ! This has been tested with rapid7/metasploit-framework#20967 and I confirmed the client re-authenticates when receiving the |
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This PR makes a small change to attempt to re-authenticate when the client receives the
STATUS_NETWORK_SESSION_EXPIREDerror. This is how Window'snet useclient responds to the error.https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-smb/6ab6ca20-b404-41fd-b91a-2ed39e3762ea
The
smb_relayMetasploit module makes it possible relay an authentication request to multiple targets, by making use of the SMB errorSTATUS_NETWORK_SESSION_EXPIRED. The relay server first tricks the client into thinking it's authentication attempt was successful, and then throws the error codeSTATUS_NETWORK_SESSION_EXPIREDwhich forces the client to re-authenticate and allows the relay server to relay to as many targets as it would like by sending that error code repeatedly.It seems like this minor detail was never implemented in ruby_smb, nor was it implemented in python's smbprotocol implementation as seen here python smb issue. This is why the
smb_relaycould never relay authentication from any client other thannet use.Testing
See the metasploit-framework PR for testing instructions