Cisco UCS C-Series Rack Servers Signature Validation Firmware signature verification

Summaryinfo

A vulnerability was found in Cisco UCS C-Series Rack Servers. It has been rated as critical. This affects an unknown function of the component Signature Validation. Performing a manipulation as part of Firmware results in signature verification. This vulnerability was named CVE-2019-1736. The attack may be carried out on the physical device. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Cisco UCS C-Series Rack Servers (Virtualization Software) (version unknown). It has been classified as critical. This affects an unknown function of the component Signature Validation. The manipulation as part of a Firmware leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on 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 presented 09/23/2020 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 uniquely identified as CVE-2019-1736 since 12/06/2018. Attacking locally is a requirement. The successful exploitation requires a authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading eliminates this vulnerability.

See VDB-150355 for similar entry. 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

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

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