SRC-2020-0013 : Cisco UCS Director MyCallable call Directory Traversal Remote Code Execution Vulnerability

CVE ID:

CVE-2020-3251

CVSS Score:

8.1, (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H)

Affected Vendors:

Cisco

Affected Products:

Cisco UCS Director and Cisco UCS Director Express for Big Data

Vulnerability Details:

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco UCS Director and Cisco UCS Director Express for Big Data. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the MyCallable class. 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 execute code in the context of the tomcatu account.

Vendor Response:

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:

• 2020-01-08 - Verified and sent to Cisco PSIRT
• 2020-04-16 – Coordinated public release of advisory

Credit:

This vulnerability was discovered by Steven Seeley (mr_me) of Source Incite