Published:2012/08/17  Last Updated:2012/08/17

mixi for Android information management vulnerability


mixi for Android contains an issue which stores friends' comments on a SD card.

Products Affected

  • mixi versions prior to 4.3.0


mixi for Android provided by mixi, Inc. contains an issue which stores friends' comments on a SD card, therefore other applications can access this information directly from the SD card.


If a user of the affected product uses a malicious Android application, friends' comments may be disclosed.


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

Vendor Status

Vendor Link
mixi, Inc. mixi (Japanese only)


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2012.08.17

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.


Kazuhiko Kusano of Graduate School of Information Sciences, Tohoku University 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-2012-4007
JVN iPedia JVNDB-2012-000078