SRC-2020-0007 : Cisco Data Center Network Manager SystemFileDAO deleteFile Directory Traversal Denial of Service Vulnerability

CVE ID:

CVE-2019-15980

CVSS Score:

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

Affected Vendors:

Cisco

Affected Products:

Data Center Network Manager

Vulnerability Details:

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Data Center Network Manager. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the processing of requests to the deleteSystemData endpoint of the SystemFileDAO Data Access Object. When parsing the path parameter in the deleteFile method, the process does not properly validate a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to delete files in the context of SYSTEM and to create a denial-of-service condition.

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-20200102-dcnm-path-trav

Disclosure Timeline:

• 2019-11-20 – Verified and sent to Cisco PSIRT
• 2020-01-03 – Coordinated public release of advisory

Credit:

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