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Sybase EAServer Remote Directory Traversal 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 directory traversal vulnerability in Sybase EAServer could allow an attacker to read arbitrary files. This condition can result in information disclosure.

The vulnerability is due to a failure by the Sybase EAServer HTTP Server to restrict directory traversals. As a result, sensitive file path locations outside the configured HTTP Server restricted directory can be accessed by an attacker. No authentication is required to access the HTTP Server.

ANALYSIS

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

By specifying a file path with multiple directory traversal sequences such as "../../../", it is possible for an attacker to access sensitive files hosted on EAServer using the privileges of the HTTP Server. An attacker may be able to read important system files, which will result in information disclosure, and can potentially lead to full host compromise.

DETECTION

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

WORKAROUND

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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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.