QID 92094

Date Published: 2024-04-01

QID 92094: SMBv2 Signing Not Required

The Server Message Block (SMB) protocol provides the basis for file and print sharing and many other networking operations, such as remote Windows administration. To prevent man-in-the-middle attacks that modify SMB packets in transit, the SMB protocol supports the digital signing of SMB packets.

Beginning with SMBv2 clients and servers, signing can be either required or not required.

Unauthorized users sniffing the network could catch many challenge/response exchanges and replay the whole thing to grab particular session keys, and then authenticate on the Domain Controller.

CVSS V3 rated as High - 6.3 severity.

CVSS V2 rated as Medium - 5.8 severity.

Solution

Customers are advised to refer to Microsoft network server: Digitally sign communications (always) or Microsoft network client: Digitally sign communications (always) for more information pertaining to SMBv2 best practices, location, values, policy management and security considerations.

Vendor References

CVEs related to QID 92094

Software Advisories

Advisory ID	Software	Component	Link

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