Cisco UCS Director AMF XML External Entity Information Disclosure Vulnerability

August 18th, 2021
ZDI-21-974 ZDI-CAN-13143

CVE ID

CVSS Score

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

Affected Vendors

Cisco

Affected Products

UCS Director

Vulnerability Details

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

The specific flaw exists within the amf endpoint, which listens on TCP port 443 by default. Due to the improper restriction of XML External Entity (XXE) references, a crafted document specifying a URI causes the XML parser to access the URI and embed the contents back into the XML document for further processing. An attacker can leverage this vulnerability to disclose information in the context of the ucsdu user.

Additional Details

Fixed in version 6.8.0


Disclosure Timeline

  • 2021-03-26 - Vulnerability reported to vendor
  • 2021-08-18 - Coordinated public release of advisory

Credit

peterjson of RedTeam@VNG Corporation

Back to Advisories