: By interacting with WSD, an attacker might identify other vulnerable devices on the subnet that wouldn't otherwise be visible through standard scanning. Practical Assessment Steps
. It allows devices to advertise their presence and services on a local network without manual configuration. While useful for seamless hardware integration, it often presents a surface for information gathering during a security assessment. Security Implications and Pentesting According to methodologies found on resources like HackTricks
Restrict inbound traffic on port 5357 via Windows Defender Firewall to trusted local subnets only.
The penetration testers followed a clear, step-by-step methodology: port 5357 hacktricks
Additionally, it uses for service discovery via multicasting.
TCP (HTTP) and UDP (Multicast discovery on port 3702).
Understanding the use and potential vulnerabilities of port 5357 and related protocols like SSDP and UPnP can significantly improve network security. Utilizing resources like HackTricks can enhance your knowledge of cybersecurity concepts, from basic to advanced levels. : By interacting with WSD, an attacker might
When assessing port 5357, the primary risk is information disclosure. By querying this port, an attacker can extract metadata about the target system without authentication. Tools such as ntbscan or custom scripts utilizing the Python impacket library can send a probe to the port and receive a response containing the computer name, workgroup, and operating system version. This is critical intelligence for an attacker; knowing the exact OS version allows them to tailor exploits specifically for that environment, bypassing generic defenses. The enumeration of this port aligns with the HackTricks philosophy of "trust but verify"—assuming a network is secure until an open port reveals that a machine is unnecessarily broadcasting its fingerprint.
Tracing the digital breadcrumbs, the analyst discovered this port belongs to the Web Services for Devices API (WSDAPI)
Restrict access to Port 5357 so that it cannot be reached from outside the local subnet or untrusted zones: Block Port 5357 inbound at the perimeter firewall. While useful for seamless hardware integration, it often
If open, the service typically identifies itself as a Microsoft HTTPAPI httpd 2.0 . This is a lightweight web server built into Windows that hosts the WSD functionality.
Port 5357 is commonly utilized by Microsoft Windows for the Web Services on Devices (WSD) API. This service allows devices like printers, scanners, and file shares to be discovered and managed automatically over a local network. While highly convenient for enterprise and home networking, exposing this port can provide attackers with valuable reconnaissance data and potential vectors for lateral movement.
If the server responds with Requested Range Not Satisfiable , the system may be vulnerable or sensitive to the exploit payload. C. SSRF and Relay Attacks
If an administrative tool or a secondary network service triggers a WSD synchronization to a malicious path, the target machine will attempt an NTLM handshake, allowing you to capture or relay the hash. SSRF and Local Port Pivoting