Microsoft Security Response Center

**How could an attacker exploit this vulnerability?** An authenticated attacker could use Remote Desktop to connect to a vulnerable system that has Plug and Play device redirection enabled. Alternatively, an attacker could plug a specially crafted USB device into the port of a vulnerable system.

**Determine if the Print Spooler service is running** Run the following in Windows PowerShell: Get-Service -Name Spooler If the Print Spooler is running or if the service is not set to disabled, select one of the following options to either disable the Print Spooler service, or to Disable inbound remote printing through Group Policy: **Option 1 - Disable the Print Spooler service** If disabling the Print Spooler service is appropriate for your enterprise, use the following PowerShell commands: Stop-Service -Name Spooler -Force Set-Service -Name Spooler -StartupType Disabled **Impact of workaround** Disabling the Print Spooler service disables the ability to print both locally and remotely. **Option 2 - Disable inbound remote printing through Group Policy** You can also configure the settings via Group Policy as follows: Computer Configuration / Administrative Templates / Printers Disable the “Allow Print Spooler to accept client connections:” policy to block remote attacks....

**How could an attacker exploit this vulnerability?** In most situations, an unauthenticated attacker could send a specially crafted packet to a targeted server utilizing the Server Name Indication (SNI) over HTTP Protocol Stack (http.sys) to process packets, causing a denial of service (DOS).

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to take additional actions prior to exploitation to prepare the target environment.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** An attacker must send the user a malicious file and convince them to open it.

**What type of information could be disclosed by this vulnerability?** An attacker who successfully exploited this vulnerability could view heap memory from a privileged process running on the server.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to win a race condition.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to win a race condition.

**What privileges could be gained by an attacker who successfully exploited the vulnerability?** An attacker who successfully exploited this vulnerability could gain administrator privileges.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** The user would have to click on a specially crafted URL to be compromised by the attacker.