CVE-2018-3968

Published: 21 March 2019

An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013.07-rc1 to 2014.07-rc2. The affected versions lack proper FIT signature enforcement, which allows an attacker to bypass U-Boot's verified boot and execute an unsigned kernel, embedded in a legacy image format. To trigger this vulnerability, a local attacker needs to be able to supply the image to boot.

Priority

Cvss 3 Severity Score

7.0

Score breakdown

Status

Package	Release	Status
u-boot Launchpad, Ubuntu, Debian	bionic	Not vulnerable (2019.07+dfsg-1ubuntu4~18.04.1)
	focal	Not vulnerable
	trusty	Does not exist
	upstream	Released (2014.07+dfsg1-1)
	xenial	Not vulnerable (2014.07+dfsg1-1)

Severity score breakdown

Parameter	Value
Base score	7.0
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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