Advisory Details

April 16th, 2020

Cisco UCS Director isEnableRestKeyAccessCheckForUser Authentication Bypass Vulnerability

ZDI-20-540
ZDI-CAN-9559

CVE ID CVE-2020-3243
CVSS SCORE 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Cisco
AFFECTED PRODUCTS UCS Director
VULNERABILITY DETAILS

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

The specific flaw exists within the processing of the X-Cloupia-Request-Key field in requests. The issue results from the lack of proper validation of the user-supplied field prior to using it in authentication operations. An attacker can leverage this vulnerability to bypass authentication 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
  • 2019-12-20 - Vulnerability reported to vendor
  • 2020-04-16 - Coordinated public release of advisory
CREDIT Steven Seeley (mr_me) of Source Incite
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