I. 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

II. DESCRIPTION

Remote exploitation of design error in Sun Microsystem's Java System Active Server Pages allows attackers to bypass administration server authentication mechanisms.

The vulnerability exists due to improper design of the ASP application server. The administration application server exists as a stand-alone service that listens on TCP port 5102. By connecting directly to this service and making requests, attackers are able to bypass authentication mechanisms introduce by the administration HTTP server...

III. ANALYSIS

Exploitation allows an attacker to bypass authentication restrictions imposed by the HTTP server. No authentication is required to communicate with the affected administration application server. The attacker only needs to be able to establish a session with the administration application server on TCP port 5102.

IV. 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.

V. 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

VI. 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

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-2406 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

VIII. DISCLOSURE TIMELINE

05/11/2007 Initial vendor notification
05/11/2007 Initial vendor response
06/03/2008 Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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