Cisco UCS C-Series Rack Servers 16.11 Signature Validation credentials management

Summaryinfo

A vulnerability identified as critical has been detected in Cisco UCS C-Series Rack Servers 16.11. The impacted element is an unknown function of the component Signature Validation. This manipulation causes credentials management. This vulnerability is registered as CVE-2019-1950. It is feasible to perform the attack on the physical device. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Cisco UCS C-Series Rack Servers 16.11 (Virtualization Software). Affected by this vulnerability is some unknown functionality of the component Signature Validation. The manipulation with an unknown input leads to a credentials management vulnerability. The CWE definition for the vulnerability is CWE-255. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.

The weakness was published 02/19/2020 as cisco-sa-20200219-ucs-boot-byp as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is known as CVE-2019-1950 since 12/06/2018. Attacking locally is a requirement. A single authentication is required for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1552 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

Similar entry is available at VDB-161763. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Virtualization Software

Vendor

• Cisco

Name

• UCS C-Series Rack Servers

Version

• 16.11

License

• commercial

Website

• Vendor: https://www.cisco.com/

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