Public Vulnerability Reports

EMC DiskXtender Authentication Bypass Vulnerability



EMC DiskXtender is a data backup and migration suite. It consists of several applications that are used to manage storing large quantities of files across multiple storage devices. The main components of the product suite are the File System Manager, the MediaStor and the License Server. These components all create RPC endpoints that can be accessed remotely. For more information see the vendor's website at the following URL.


Remote exploitation of an authentication bypass vulnerability in EMC Corp.'s DiskXtender could allow an attacker to execute arbitrary code.

Each of the main components of the DiskXtender suite is vulnerable to an authentication bypass vulnerability. Specifically, the authentication code contains a hard-coded login and password. By connecting to the RPC interface, and logging on with these credentials, it is possible to bypass the normal authentication process.


Exploitation of this vulnerability results in an unauthenticated attacker gaining administrative access to the DiskXtender server. This allows an attacker to create and delete files on the backup server, and run other DiskXtender commands. This could potentially lead to the execution of arbitrary code with SYSTEM privileges.


iDefense confirmed the existence of this vulnerability in DiskXtender version 6.20.060 for Windows. Previous versions may also be affected.


iDefense is currently unaware of any effective workaround for this issue.


"EMC has issued updates to correct this issue. More details can be found in knowledgebase article emc184091 available from EMC customers can further contact EMC Software Technical Support at 1-877-534-2867."


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-0961 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


02/21/2008 Initial vendor notification
02/22/2008 Initial vendor response
04/09/2008 Coordinated public disclosure


This vulnerability was reported to iDefense by Stephen Fewer of Harmony Security (

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Copyright © 2008 Verisign, Inc.

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