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Sybase EAServer Web Service Remote Installation Vulnerability

10.01.11

BACKGROUND

Sybase EAServer is the leading solution for distributed and web-enabled PowerBuilder applications. EA Server can be used to run multiple websites, portals or web applications. It allows access from web browsers and provides a development platform for enterprise web services.

DESCRIPTION

Remote exploitation of a design vulnerability in Sybase EAServer could allow an attacker to install arbitrary web services. This condition can result in arbitrary code execution.

The vulnerability is due to a design error which allows a user to install or uninstall web services via a certain web application. This web application is installed by default on the EAServer HTTP Server and does not require authentication.

ANALYSIS

Exploitation of this vulnerability could allow an attacker to gain execution control over the affected machine.

By specifying a URL to a web service (WDSL) hosted at a remote location, it is possible for an attacker to install a malicious web service on the target Sybase EAServer host. Once installed, the web service can execute on the target host. An attacker may be able to execute arbitrary code or read and write to important system files, which can result in arbitrary code execution.

DETECTION

Versions of EAServer prior from 6.3 ESD#2, and 6.3.1 are vulnerable.

WORKAROUND

The vulnerable application is hosted on a HTTP Server. The HTTP Server uses TCP port 8000 by default. This port my be firewalled on the EAServer host.

VENDOR RESPONSE

Sybase has released patches which address this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown. http://downloads.sybase.com

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

09/01/2010 Initial Vendor Notification
09/07/2010 Initial Vendor Reply
01/10/2011 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by AbdulAziz Hariri.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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