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ESA-2011-003: EMC NetWorker librpc.dll spoofing vulnerability. Jan 26 2011 10:03PM
Security_Alert emc com

Hash: SHA1

ESA-2011-003: EMC NetWorker librpc.dll spoofing vulnerability.

EMC Identifier: ESA-2011-003

CVE Identifier: CVE-2011-0321

Severity Rating: CVSS v2 Base Score: 8.5 (AV:N/AC:L/Au:N/C:P/I:N/A:C)

Affected products:

EMC NetWorker earlier than

EMC NetWorker earlier than

Vulnerability Summary:

A vulnerability exists in EMC NetWorker which can be exploited to potentially create a denial of service condition or eavesdrop on process communications.

Vulnerability Details:

EMC Networker uses an RPC library to provide a portmapper service within nsrexecd. The portmapper restricts access for service commands to the localhost. However, the UDP protocol allows malicious users to spoof the source address of the network packet making it appear it originated from the localhost. This potentially may allow a remote malicious user to unregister existing NetWorker RPC services or register new RPC services.

Problem Resolution:

The following EMC NetWorker products contain resolutions to this issue:

EMC NetWorker version

EMC NetWorker version 7.5 SP4 and later

EMC NetWorker version and later

EMC strongly recommends all customers apply the latest patches which contain the resolution to this issue, at the earliest opportunity.

Link to remedies:

For 7.5 SP3 and earlier users:

This fix is available in build and 7.5 SP4. EMC recommends updating to the 7.5 SP4 version. Registered EMC Powerlink customers can download the NetWorker 7.5 SP4 software from Powerlink. For NetWorker Software, navigate in Powerlink to Home > Support > Software Downloads and Licensing > Downloads J-O > NetWorker.

For 7.6 SP1 and 7.6 users:

The fix is available in and subsequent cumulative build releases. For details on the 7.6.1.x cumulative fix releases including download details, refer to the NetWorker 7.6 Cumulative Hotfix Summary document on EMC Powerlink.

Because the view is restricted based on customer agreements, you may not have permission to view certain downloads. Should you not see a software download you believe you should have access to, follow the instructions in EMC Knowledgebase solution emc116045.

For explanation of Severity Ratings, refer to EMC Knowledgebase solution emc218831. EMC recommends that all customers take into account both the base score and any relevant temporal and environmental scores, which may impact the potential severity associated with particular security vulnerability.


EMC would like to thank an anonymous researcher working with TippingPoint's Zero Day Initiative (http://www.zerodayinitiative.com) for reporting this issue.

EMC Corporation distributes EMC Security Advisories in order to bring to the attention of users of the affected EMC products important security information. EMC recommends all users determine the applicability of this information to their individual situations and take appropriate action. The information set forth herein is provided "as is" without warranty of any kind. EMC disclaims all warranties, either express or implied, including the warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event shall EMC or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if EMC or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

EMC Product Security Response Center

Security_Alert (at) EMC (dot) com [email concealed]


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