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CA ARCserve Backup for Laptops and Desktops Authentication Bypass Vulnerability

09.20.07

BACKGROUND

ARCServe Backup for Laptops and Desktops is a version of ARCServe Backup targeted at small to medium sized businesses, with many mobile/remote users. It provides client agents that detect network connectivity and commit backup data when it is found. For more information, consult the product home page at the following URL.

http://www3.ca.com/solutions/Product.aspx?ID=263

DESCRIPTION

Remote exploitation of an authentication bypass vulnerability in Computer Associates Inc.'s ARCServe Backup for Laptops and Desktops allows attackers to execute arbitrary code with SYSTEM privileges.

This vulnerability specifically exists since the command handlers that service network requests do not check to see if the peer is authenticated.

ANALYSIS

Exploitation of this vulnerability allows an attacker to execute all commands granted to the server administrator. An attacker can add and delete users and entire organizations, and initiate restore operations for clients that connect to the server.

Using this vulnerability, an attacker is able to upload arbitrary files to the server. This results in the execution of arbitrary code with SYSTEM privileges.

DETECTION

iDefense has confirmed the existence of this vulnerability in ARCServe Backup for Laptops and Desktops version R11.1 Build 900. Other versions may also be affected.

WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VENDOR RESPONSE

Computer Associates has addressed this vulnerability with an update. For more information consult CA's security notice at the following URL.

http://supportconnectw.ca.com/public/sams/lifeguard/infodocs/caarcservebld-securitynotice.asp

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-5006 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

03/06/2007 Initial vendor notification
03/06/2007 Initial vendor response
09/20/2007 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2007 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.