Ichitaro series buffer overflow vulnerability


The "Ichitaro" series word processing software contains a buffer overflow vulnerability.

This vulnerability is different from JVN#29211062, JVN#32981509 and JVN#50495547.

The "Ichitaro" series word processing software, from JustSystems Corporation, contains an issue in the reading of Rich Text Files resulting in a buffer overflow vulnerability. When a user opens a specially crafted file locally or through a website, arbitrary code may be executed with privleges of the user.

Yuji Ukai of Fourteenforty Research Institute, Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V2 Severity:
Base Metrics 6.8 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

JustSystems Corporation
  • Ichitaro 2009
  • Ichitaro Government 2009
  • Ichitaro 2009 trial version
  • Ichitaro 2008
  • Ichitaro Government 2008
  • Ichitaro 2007
  • Ichitaro Government 2007
  • Ichitaro 2006
  • Ichitaro Government 2006
  • Ichitaro 2005
  • Ichitaro Bungei
  • Ichitaro 2004
  • Ichitaro 13
  • Ichitaro Viewer 2009 version and earlier


An attacker could execute arbitrary code with the privileges of the user.

[Update the Software]
Apply the update module provided by JustSystems.
Vendor Information

JustSystems Corporation
CWE (What is CWE?)

  1. Buffer Errors(CWE-119) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2009-4737

  1. JVN : JVN#33846134
  2. National Vulnerability Database (NVD) : CVE-2009-4737
  3. IPA SECURITY ALERTS : Security Alert for Security Vulnerability in the Ichitaro Series
  4. Secunia Advisory : SA34611
  5. SecurityFocus : 34403
  6. ISS X-Force Database : 49739
  7. VUPEN Security : VUPEN/ADV-2009-0957
Revision History

  • [2010/03/23]
      Web page published