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Sun Java System Active Server Pages File Creation Vulnerability

03.06.08

BACKGROUND

Sun Java System Active Server Pages is a multi-platform ASP application server. It provides provides ASP (Active Server Pages) functionality to a web server. More information is available at the following URL.

http://www.sun.com/software/chilisoft/index.xml

DESCRIPTION

Remote exploitation of a file creation vulnerability in Sun Microsystem's Java System Active Server Pages allows attackers to execute arbitrary code with root privileges.

The vulnerability exists within a file included by several ASP applications. This file provides a function that will write the contents contained within its first parameter to a file specified by its second parameter. Several ASP applications allow an attacker to control both the content and the location of the file written.

ANALYSIS

Exploitation allows an attacker to create, or append to, arbitrary files on the system with root privileges. No authentication is required to reach the affected ASP applications. The attacker only needs to be able to establish a session with the administration server on TCP port 5100.

DETECTION

iDefense has confirmed the existence of this vulnerability within version 4.0.2 of Sun Microsystems Inc.'s Java System Active Server Pages. Older versions are suspected to be vulnerable.

WORKAROUND

In order to prevent exploitation of this vulnerability, disable administration server by executing the following command as the 'root' user.

 # /opt/casp/admtool -e 

Additionally, removing the affected ASP applications will prevent exploitation.

VENDOR RESPONSE

Sun Microsystems has addressed this vulnerability with the release of version 4.0.3 of Sun Java System Active Server Pages. For more information, refer to Sun Alert 238184 at the following URL.

http://sunsolve.sun.com/search/document.do?assetkey=1-66-238184-1

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-2401 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

04/04/2007 Initial vendor notification
04/05/2007 Initial vendor response
06/03/2008 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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