Published:2007/10/25  Last Updated:2008/05/21

Ichitaro series buffer overflow vulnerability


The "Ichitaro" series word processing software contains a buffer overflow vulnerability. This vulnerability is different from JVN#29211062 and JVN#32981509.

Products Affected

  • Ichitaro Viewer
  • Ichitaro 11
  • Ichitaro 12
  • Ichitaro 13
  • Ichitaro 2004
  • Ichitaro 2005
  • Ichitaro Bungei
  • Ichitaro 2006
  • Ichitaro Government 2006
  • Ichitaro 2007
  • Ichitaro Government 2007
  • Ichitaro 2007 trial version
  • Ichitaro Lite2
  • Ichitaro for Linux


The "Ichitaro" series word processing software, from JustSystems Corporation, contains a buffer overflow vulnerability. If a user opens a specially crafted jtd file or views it on a web browser, an attacker could execute arbitrary code with the privileges of the user.


An attacker could execute arbitrary code with the privileges of the user who opened the specially crafted jtd file.


Update the Software
Apply the update module provided by JustSystems.

Vendor Status

Vendor Link
JustSystems Corporation


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2007.10.25

Measures Conditions Severity
Access Required Routed - can be attacked over the Internet using packets
  • High
Authentication None - anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required Simple - 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
  • Medium
Exploit Complexity Low-Medium - some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Medium-High

Description of each analysis measures


Yuji Ukai of Fourteenforty Research Institute, Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the vendors under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
JVN iPedia JVNDB-2007-000878

Update History