Vulnerability Note VU#407641

EMC Legato NetWorker database services use insufficient authentication

NetWorker database services

At least two of the processes run by a NetWorker server provide database services. The database on a NetWorker server contains system configuration information, including licenses, client configurations, backup schedules, and storage devices. The server database also contains a mechanism for controlling backups remotely.

NetWorker database service authentication and authorization

NetWorker uses a token-based authentication scheme to determine the identity of a user who attempts to access the network databases. After a database client submits its credentials to the server, the server compares the credentials to an administrator list. The server then grants a token to the client that contains information about the client, including whether the client has administrative privileges.

The problem

NetWorker does not perform adequate authentication of the tokens. An attacker can create or modify a token to grant administrative privileges to himself, regardless of whether the attacker is in the administrator list. An attacker with administrative access to the NetWorker databases can gain complete control of a vulnerable NetWorker server.

II. Impact

Apply a patch or upgrade, as specified in the EMC Legato Technical Product Alert.

Sun Solstice Backup and StorEdge Enterprise Backup customers should see Sun Alert 101866 for patch availability.

Restrict access

You may wish to block access to the vulnerable software from outside your network perimeter, specifically by blocking access to the ports used by NetWorker (typically TCP and UDP ports 7937-9936). This will limit your exposure to attacks. However, blocking at the network perimeter would still allow attackers within the perimeter of your network to exploit the vulnerability. The use of host-based firewalls in addition to network-based firewalls can help restrict access to specific hosts within the network. It is important to understand your network's configuration and service requirements before deciding what changes are appropriate.

Systems Affected

http://www.legato.com/support/websupport/product_alerts/081605_NW-7x.htm
http://www.legato.com/support/websupport/product_alerts/081605_NW_token_authentication.htm
http://sunsolve.sun.com/search/document.do?assetkey=1-26-101886-1
http://www.legato.com/support/websupport/tech_bulletins/?includefile=388.html
http://www.legato.com/products/networker/
http://secunia.com/advisories/16464/
http://secunia.com/advisories/16470/
http://www.cnn.com/2005/TECH/internet/07/25/hackers.backup.software.reut/index.html

Credit

Thanks to the NOAA NCIRT Lab for reporting this vulnerability.

This document was written by Will Dormann.

Other Information

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