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DSA-2021-124: Dell EMC NetWorker Security Update for Multiple Vulnerabilities

Summary: Mitigations are available for multiple vulnerabilities affecting Dell EMC NetWorker that may be exploited by malicious users to gain access to unauthorized information.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.

Impact

Medium

Details

 
Propriety Code CVEs  Description CVSS Base Score CVSS Vector String
CVE-2021-21569 Dell NetWorker, versions 18.x and 19.x contain a Path traversal vulnerability. A NetWorker server user with remote access to NetWorker clients may potentially exploit this vulnerability and gain access to unauthorized information.  6.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
CVE-2021-21570
 
Dell NetWorker, versions 18.x and 19.x contain an Information disclosure vulnerability. A NetWorker server user with remote access to NetWorker clients may potentially exploit this vulnerability and gain access to unauthorized information. 6.8 CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H


 
Propriety Code CVEs  Description CVSS Base Score CVSS Vector String
CVE-2021-21569 Dell NetWorker, versions 18.x and 19.x contain a Path traversal vulnerability. A NetWorker server user with remote access to NetWorker clients may potentially exploit this vulnerability and gain access to unauthorized information.  6.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
CVE-2021-21570
 
Dell NetWorker, versions 18.x and 19.x contain an Information disclosure vulnerability. A NetWorker server user with remote access to NetWorker clients may potentially exploit this vulnerability and gain access to unauthorized information. 6.8 CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H


Dell Technologies recommends all customers consider both the CVSS base score and any relevant temporal and environmental scores that may impact the potential severity associated with a particular security vulnerability.

Affected Products & Remediation

CVEs Addressed Product Affected Versions Updated Version Link to Update
CVE-2021-21569 Dell EMC NetWorker Dell EMC NetWorker 18.x, 19.1.x, 19.2.x, 19.3.x, and 19.4.x versions prior to 19.4.0.4 19.4.0.4

If an updated version cannot be applied, follow the workaround that is detailed in the Workarounds and Mitigations section of this DSA.
https://www.dell.com/support/home/en-in/product-support/product/networker/drivers
CVE-2021-21570
CVEs Addressed Product Affected Versions Updated Version Link to Update
CVE-2021-21569 Dell EMC NetWorker Dell EMC NetWorker 18.x, 19.1.x, 19.2.x, 19.3.x, and 19.4.x versions prior to 19.4.0.4 19.4.0.4

If an updated version cannot be applied, follow the workaround that is detailed in the Workarounds and Mitigations section of this DSA.
https://www.dell.com/support/home/en-in/product-support/product/networker/drivers
CVE-2021-21570

Workarounds & Mitigations

These vulnerabilities can be partially mitigated by configuring the Dell EMC NetWorker server to use nsrauth authentication, and configuring the NetWorker nonempty servers file. Follow the recommendations in the security configuration guide for your product version. These actions limit the scope of exploitation to authorized NetWorker users already defined with “Operator” level or higher privileges.

Mitigation procedure:
Step 1:
Configure the Dell EMC NetWorker server to use nsrauth:
See Security Configuration Guide Chapter 2.
Access Control Settings:
Component access control > Component authentication > Modifying the authentication methods used by NetWorker hosts

Step 2:
Configure the NetWorker nonempty servers file:
See Security Configuration Guide Chapter 2.
Access Control Settings:
Component access control > Component authorization > Restricting remote program executions and client-tasking rights

Note: If you are unsure of your NetWorker server's hostname or IP address, it is recommended to update the servers file with local hostname or IP address.

Security Configuration Guide Links:   

Revision History

RevisionDateDescription
1.02021-06-12Initial Release
1.12021-09-02Updated 'Affected Products and Remediation' Section

Acknowledgements

Dell would like to thank Quentin Kaiser for reporting these vulnerabilities.

Related Information

Affected Products

NetWorker Family, NetWorker, NetWorker Series, Product Security Information
Article Properties
Article Number: 000188311
Article Type: Dell Security Advisory
Last Modified: 02 Sep 2021
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