Reviewed October 21, 2026. Commands are examples for an authorized, isolated lab; no target results are asserted here.
SMB protocol version, Samba software version and the local smbclient version are three different facts. If a share listing does not reveal a Samba version, that is not necessarily a broken client or a blocked permission. The remote service may not expose an exact build through the request you made.
Label each clue before using it
| Clue | What it describes | What it cannot establish alone |
|---|---|---|
smbclient -V | The locally executed client’s version | The remote Samba version |
| Negotiated dialect | The protocol chosen for one connection | The full supported dialect set or software package build |
| Supported-dialect probe | Dialects accepted in the probe’s tested conditions | Which dialect another session actually negotiated |
| Server description or LAN Manager/OS metadata | A returned remote string | An independently verified installed build or patch level |
| Service-detection match | A tool’s identification from its probes and signatures | Exact package revision or vulnerability status |
| Administrator-controlled package and running-service evidence | Host-side software information, when access is authorized | That every running instance uses the same binary or has the same configuration |
Samba’s server description is configurable. Even when it includes a version-looking number, retain the original field and label it as advertised metadata. An OS label also need not describe the host’s actual operating system. Two tools may repeat the same underlying string; agreement does not automatically make their evidence independent.
Ask one question at a time
“Which client am I running?”
smbclient -V
smbclient --helpRun these on the lab client and label them “client version/help.” There is no remote target in this command, so it cannot report the target’s package version.
“Which SMB dialects respond on this lab service?”
Review the installed script’s help and the Nmap smb-protocols documentation. The script actively attempts dialect connections. Its upstream categories are safe and discovery, but that label does not replace your exercise’s scope.
# Local help; no target supplied
nmap --script-help smb-protocols
# Optional scoped probe; replace both placeholders
nmap -p SMB_PORT --script smb-protocols TARGET_IPUse the verified target and observed SMB port, not an unreviewed subnet. Read the script’s result as dialect support observed during that probe, not as “Samba version X.” Preserve the Nmap version and command with the result. No output may reflect filtering, connectivity, script applicability or an unsuccessful request; it is not proof that SMB is absent.
“Does the service return identifying metadata?”
Existing service-detection output may already answer this. If further metadata discovery is part of the exercise, inspect nmap --script-help smb-os-discovery and its official documentation before selecting that separate probe. This script attempts to retrieve fields such as OS and computer/workgroup names; fields can be omitted. It does not promise an exact Samba package version on every dialect or target.
Do not run a bundle of tools merely to make the field nonempty. Do not downgrade authentication, guess credentials or enable a legacy protocol simply to chase a banner. If the task is share access, continue with the operation checklist instead.
Handle conflicting evidence explicitly
Compare destination, port, timestamp, client/script version, requested identity and the precise field each tool reported. A negotiated SMB2 dialect and a Samba-looking description are not conflicting results: one is a protocol observation, the other is metadata. A newer client version and an older server string can also both be true.
If two service matches disagree, preserve both and leave the exact build unconfirmed. An additional probe helps only when it tests a specific explanation. A returned version-like string is insufficient to claim a particular vulnerability: distribution backports, configuration and feature availability can change applicability.
A useful report can contain “unknown”
Illustrative wording: “The service accepted the dialects listed in the saved probe output. A remote description included a Samba-like identifier. The exact installed Samba package and patch status were not confirmed.” Attach your actual evidence; do not reuse an example as a finding.
Host-side verification belongs to an administrator-authorized task. Ask for package inventory and evidence linking the running service to its binary and build. Running a version command on Kali would still inspect Kali, not the remote VM. Until that distinction is resolved, report the remote package version as unknown.
Further reading: smbclient manual, Samba server string, and the limits of NetBIOS name evidence.