Published:2011/01/21  Last Updated:2011/01/21

Lunascape may insecurely load dynamic libraries


Lunascape may use unsafe methods for determining how to load DLLs.

Products Affected

  • Lunascape 6.3.4 and earlier


Lunascape is a web browser. Lunascape loads certain DLL's when HTML files are opened. Lunascape contains an issue with the DLL search path, which may lead to insecurely loading dynamic libraries.


An attacker may execute arbitrary code with the privilege of running the application.


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

This issue was resolved in Lunascape 6.4.0.
However, Lunascape 6.4.0 contained separate issues and is not available.
Lunascape 6.4.1 was released on Jan 19, 2011 and contains a fix for this issue.

Vendor Status

Vendor Status Last Update Vendor Notes
Lunascape Corporation vulnerable 2011/01/21


  1. US-CERT Vulnerability Note VU#707943
    Microsoft Windows based applications may insecurely load dynamic libraries

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.01.21

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 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 suspiciouse
  • High

Description of each analysis measures


Makoto Shiotsuki 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-2010-3927
JVN iPedia JVNDB-2011-000004

Update History

Lunascape Corporation update status