Internet Explorer cross-domain policy bypass


Internet Explorer contains a flaw that may allow an attacker to bypass cross-domain policies.

Yosuke HASEGAWA of Secure Sky Technology Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: None
  • Availability Impact: None
Affected Products

The following products without Cumulative Security Update (3134220) are affected.

Microsoft Corporation
  • Microsoft Internet Explorer 9
  • Microsoft Internet Explorer 10
  • Microsoft Internet Explorer 11


When a specially crafted content is opened, cross-domain policies may be bypassed and then information of the URL that the user is accessing may be obtained by an attacker.

[Update the Software]
This issue was addressed in MS16-009 released on February 10, 2016. Apply the update according to the information provided by Microsoft.
Vendor Information

Microsoft Corporation
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-0069

  1. JVN : JVN#78383854
  2. National Vulnerability Database (NVD) : CVE-2016-0069
  3. IPA SECURITY ALERTS : Security Alert for Vulnerability in Microsoft Security Bulletin (in Japanese)
  4. JPCERT REPORT : JPCERT-AT-2016-0007
  5. @Police : For Microsoft Security Bulletin (MS16-009,011,012,013,014,015,016,017,018,019,020,021,022)(2016/02/10) (in Japanese)
Revision History

  • [2016/02/19]
      Web page was published
      References : Contents were added