Published:2012/04/13  Last Updated:2012/04/13

JVN#33283707
ActiveScriptRuby vulnerable to arbitrary Ruby script execution

Overview

ActiveScriptRuby contains a vulnerability where an arbitrary Ruby script may be executed on a web browser that can execute ActiveX controls when HTML is displayed.

Products Affected

  • ActiveScriptRuby
ActiveScriptRuby with GRScript18.dll versions prior to 1.2.2.0 are affected.

Description

ActiveScriptRuby is a software to implement Ruby into a Windows environment. ActiveScriptRuby contains a vulnerability where an arbitrary Ruby script may be executed on the web browser that can execute ActiveX controls when HTML is displayed.

Impact

A remote attacker may be able to obtain information on the system or cause a denial-of-service (DoS).

Solution

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

Apply a workaround
The following workaround may mitigate the affects of this vulnerability.

  • Un-register the COM server by executing the command below
    regsvr32 /u ASR-1.8install directory\bin\GRScript18.dll

Vendor Status

Vendor Link
COM Meets Ruby ANN: ActiveScriptRuby updated to 1.8.7 - fix a vulnerability (Japanese only)
About ActiveScriptRuby (Japanese only)

References

JPCERT/CC Addendum

This JVN publication was delayed to 2012/04/13 after the developer fix was developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2012.04.13

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

Credit

Moca reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Alert
JPCERT Reports
CERT Advisory
CPNI Advisory
TRnotes
CVE CVE-2012-1241
JVN iPedia JVNDB-2012-000031