: It provides an HTTP-based discovery mechanism. When accessed via a browser, it may return a "404 Not Found" or a simple status message if the service is active but not configured to serve a root page. Enumeration & Pentesting Approach
Poorly secured WSD services can expose web-based admin pages for printers or scanners, potentially allowing attackers to view or submit print jobs.
"Web Services for Devices," Elena muttered to herself, opening a new tab in her browser. She navigated to HackTricks, the bible for modern penetration testers. She typed the port number into the search bar.
To protect systems from unauthorized enumeration and potential exploitation via Port 5357, implement the following defensive controls:
Port 5357 is primarily used by the , which is Microsoft's implementation of the WS-Discovery protocol. Its core function is to allow devices on a local network—such as printers, scanners, and file shares—to advertise their presence and discover one another without the need for manual configuration or a central server. Service Name: http Protocol: TCP (typically) Associated Port: 5358 (often used as the HTTPS counterpart) port 5357 hacktricks
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: Windows uses it to enable seamless, configuration-free network discovery.
The Server: Microsoft-HTTPAPI/2.0 banner confirms it is a Windows machine running native web services. 3. Vulnerability Analysis & Exploitation Vectors Information Disclosure (Device Metadata)
: Disable the Function Discovery Provider Host (FDPHost) and Function Discovery Resource Publication (FDResPub) services in services.msc . : It provides an HTTP-based discovery mechanism
The discovery process usually begins with a multicast message over . Once a device is discovered and a handshake is completed, further communication and data exchange move to TCP port 5357 (HTTP) or TCP port 5358 (HTTPS).
: Attempt to browse the port via HTTP. While it may not serve a traditional webpage, it may respond with XML data or SOAP responses that reveal device identity. Network Context
Exposed printer or scanner interfaces can sometimes be accessed without authentication, potentially allowing job manipulation or further reconnaissance within a local network. Mitigation Additional WS-Discovery Functionality - Win32 apps
Port 5357 – WSDAPI (Web Services for Devices) - PentestPad "Web Services for Devices," Elena muttered to herself,
This forces TARGET-50 (WSD-enabled printer server) to authenticate to your machine on SMB.
Restrict port 5357 to the local subnet or block it entirely on corporate networks where automated network discovery is unneeded.
"Recommendation: Block Port 5357/tcp on the perimeter firewall immediately. The exposed WS-Discovery service allowed for the enumeration of the primary Domain Controller hostname ('LEDGER-DC01') and internal network topology without authentication."