Published:2011/06/10  Last Updated:2011/06/30

Java Web Start may insecurely load settings files


Java Web Start provided Oracle may use unsafe methods for determining how to load settings files.

Products Affected

  • Java SE 6 Update 25 and earlier for Windows


Java Web Start is tool to distribute Java applications over the web and is contained in Java applications such as JRE (Java Runtime Environment) Java Web Start contains an issue with the file search path, which may insecurely load settings files.


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


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


  1. IPA
    Security Alert for Java Web Start Vulnerability

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.06.10

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


Hisashi Kojima of Fujitsu Laboratories, Ltd. reported this vulnerability to IPA.
JPCERT/CC coordinated with the vendor under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2011-0786
JVN iPedia JVNDB-2011-000034

Update History

Information under the sections "References" were modified.