Published:2012/04/24  Last Updated:2012/04/24

Multiple JustSystems products may insecurely load dynamic libraries


Multiple JustSystems products may use unsafe methods for determining how to load DLL's.

Products Affected

  • Ichitaro 2011 Sou
  • Ichitaro 2011/2010/2009/2008/2007/2006
  • Ichitaro Government 2010/2009/2008/2007/2006
  • Ichitaro Portable with oreplug
  • Ichitaro Viewer
  • JUST School 2010/2009
  • JUST School
  • JUST Jump 4
  • JUST Frontier
  • oreplug


Multiple JustSystems products contain an issue with the DLL search path, which may lead to insecurely loading dynamic libraries.


Arbitrary code may be executed with the privileges of the running application.


Update the software
Apply the appropriate update according to the information provided by the developer.


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2012.04.24

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 standard action that does not feel harmful to most users, such as click on a link or view a file
  • Mid
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


Naoto Katsumi of LAC Co., Ltd. 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-2012-1242
JVN iPedia JVNDB-2012-000034