Microsoft Windows 'HTTP.sys' Remote Denial of Service Vulnerability

ID SMNTC-59784
Type symantec
Reporter Symantec Security Response
Modified 2013-05-14T00:00:00



Microsoft Windows is prone to a remote denial-of-service vulnerability. Successful exploits will allow attackers to cause the affected computer to stop responding resulting in a denial-of-service condition.

Technologies Affected

  • Microsoft Windows 8 for 32-bit Systems
  • Microsoft Windows 8 for 64-bit Systems
  • Microsoft Windows RT
  • Microsoft Windows Server 2012


Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't required. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploits.

Run all software as a nonprivileged user with minimal access rights.
To mitigate the impact of a successful exploit, run the affected application as a user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for anomalous or suspicious activity. Monitor logs generated by NIDS and by the server itself for evidence of attacks against the server.

Do not accept or execute files from untrusted or unknown sources.
Never accept files from untrusted or unknown sources, because they may be malicious in nature. Avoid opening email attachments from unknown or questionable sources.

Do not use client software to access unknown or untrusted hosts from critical systems.
Do not visit sites of unknown origin or questionable integrity with client software.

Updates are available. Please see the references or vendor advisory for more information.