Published:2013/03/29  Last Updated:2013/03/29

OpenWnn for Android vulnerable to information disclosure


OpenWnn for Android contains an issue in the access permissions for certain files.

Products Affected

  • OpenWnn for Android 1.3.5 and earlier


OpenWnn provided by OMRON SOFTWARE Co., Ltd. is a Japanese Input Method Editor (IME). OpenWnn for Android contains an issue in the access permissions for certain files.


If a user of the affected product uses other malicious Android application, information managed by the affected product may be disclosed.


Update the software
Update to the latest version according to the information provided by the developer.

Apply a workaround
The following workaround may mitigate the affects of this vulnerability until an update can be applied.

  • Stop using OpenWnn for Android and use another IME software.

Vendor Status

Vendor Status Last Update Vendor Notes
OMRON SOFTWARE Co., Ltd. Vulnerable 2013/03/29 OMRON SOFTWARE Co., Ltd. website


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2013.03.29

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 difficult or suspicious action. If the honest user must have elevated privileges, they are likely to be more suspicious
  • Low
Exploit Complexity some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Mid-High

Description of each analysis measures


This analysis assumes that the user is tricked into installing a malicious application.


Gaku Mochizuki of Mitsui Bussan Secure Directions, 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-2013-2301
JVN iPedia JVNDB-2013-000025