Synopsis
While researching CVE-2017-6640, Tenable discovered an unauthenticated path traversal vulnerability in Cisco Prime Data Center Network Manager. The vulnerability is present in the XmpFileUploadServlet class in dcnmweb.war. As the name suggests, XmpFileUploadServlet handles file uploads over HTTP. As such, the path traversal can be used to write a file to any location on the server. An unauthenticated remote attacker can achieve remote code execution by uploading a war file that contains a JSP webshell.
Proof of concept:
curl -k -F 'data=@/tmp/webshell.war' "https://172.26.24.15/Upload?svc=upload&maxFileSize=100000&tacCaseID=../../../../Program%20Files/Cisco%20Systems/dcm/jboss-as-7.2.0.Final/standalone/sandeployments"
Cisco reports that this vulnerability also affects Cisco Prime Infrastructure. However, for that case an attacker first needs to be authenticated before they can reach the vulnerability.
Solution
Cisco has released fixes for both Data Center Network Manager and Prime Infrastructure. Read their advisory for patching information.Additional References
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-prime-uploadDisclosure Timeline
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