CVE-2019-1736 Multiple Cisco UCS-Based Products UEFI Secure Boot Bypass Vulnerability
An authenticated physical attacker can bypass UEFI Secure Boot to load compromised firmware images on Cisco UCS servers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1736?
CVE-2019-1736 is a medium-severity vulnerability in Cisco Identity Services Engine, published on 23 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-347
Which versions are affected by CVE-2019-1736?
It affects 22 products.
Products include Cisco Fmc1000-K9 Bios, Cisco Fmc1000-K9 Firmware, Cisco Fmc2500-K9 Bios, Cisco Fmc2500-K9 Firmware, Cisco Fmc4500-K9 Bios, Cisco Fmc4500-K9 Firmware and 16 more.
How do I fix CVE-2019-1736?
No fix has been published for CVE-2019-1736 yet. Limit exposure of the affected software until one is available.
Is CVE-2019-1736 being exploited?
There is no known exploitation of CVE-2019-1736 in the wild and no public exploit code.
Sources
Also known as GHSA-pwvv-633w-65j9.