Published:2011/08/10  Last Updated:2011/08/10

Windows URL Protocol Handler may insecurely load executable files


Windows URL Protocol Handler may use unsafe methods for determining how to load executable (.exe) files.

Products Affected

Products that use the Windows URL Protocol Handler may be affected.

For more information, refer to the developer's website.


Windows URL Protocol Handler loads a specified executable for each protocol. Windows URL Protocol Handler contains an issue with the file search path, which may insecurely load executable files.


An attacker may execute arbitrary code with the privilege of the running application.


Update the Software
Apply the MS11-057 according to the information provided by Microsoft.


  1. IPA
    Security Alert for Windows Vulnerability

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.08.10

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file
  • Mid
Exploit Complexity the user must be convinced to take a difficult or suspicious action. If the honest user must have elevated privileges, they are likely to be more suspiciouse
  • High

Description of each analysis measures


Makoto Shiotsuki of Security Professionals Network Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2011-1961
JVN iPedia JVNDB-2011-000060

Update History

Information under the sections "References" were modified.