Cisco UCS Director saveWindowsNetworkConfig Directory Traversal Denial-of-Service Vulnerability

April 16th, 2020
ZDI-20-544 ZDI-CAN-9604

CVE ID

CVE-2020-3249

CVSS Score

8.2 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected Vendors

Cisco

Affected Products

UCS Director

Vulnerability Details

This vulnerability allows remote attackers to overwrite arbitrary files on affected installations of Cisco UCS Director. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the saveWindowsNetworkConfig method. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Additional Details

Cisco has issued an update to correct this vulnerability. More details can be found at:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsd-mult-vulns-UNfpdW4E

Disclosure Timeline

  • 2019-12-27 - Vulnerability reported to vendor
  • 2020-04-16 - Coordinated public release of advisory

Credit

Steven Seeley (mr_me) of Source Incite

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