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CVE-2019-1736

MEDIUMCVSS 6.6/10EPSS 0.25%

Last modified

CVE-2019-1736 is a medium-severity vulnerability rated 6.6/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.6/10

CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.25%

15.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFmc1000-K9 Bios< 4.0.1f.0
CiscoFmc1000-K9 Firmware< 4.0.2h
CiscoFmc2500-K9 Bios< 4.0.1f.0
CiscoFmc2500-K9 Firmware< 4.0.2h
CiscoFmc4500-K9 Bios< 4.0.1f.0
CiscoFmc4500-K9 Firmware< 4.0.2h
CiscoSns-3515-K9 Bios< 4.0.2d
CiscoSns-3515-K9 Firmware< 4.0.2h
CiscoSns-3595-K9 Bios< 4.0.2d
CiscoSns-3595-K9 Firmware< 4.0.2h
CiscoSns-3615-K9 Bios< 4.0.1i
CiscoSns-3615-K9 Firmware< 4.0.1g
CiscoSns-3655-K9 Bios< 4.0.1i
CiscoSns-3655-K9 Firmware< 4.0.1g
CiscoSns-3695-K9 Bios< 4.0.1i
CiscoSns-3695-K9 Firmware< 4.0.1g
CiscoTg5004-K9 Bios< 4.0.2d
CiscoTg5004-K9 Firmware< 4.0.2h
CiscoTg5004-K9-Rf Bios< 4.0.2d
CiscoTg5004-K9-Rf Firmware< 4.0.2h
CiscoIdentity Services Engine2.4\(0.357\)
CiscoIdentity Services Engine2.6\(0.156\)
CiscoUnified Computing System3.2\(3h\)c

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-1736?
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.
How severe is CVE-2019-1736?
CVE-2019-1736 has a CVSS score of 6.6/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1736?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-1736?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST