Improper Verification of Cryptographic Signature in Universal Boot Loader (U-Boot) - CVE-2018-3968
Published: March 21, 2019 / Updated: August 8, 2020
Vulnerability identifier: #VU36050
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-3968
CWE-ID: CWE-347
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: DENX
Affected software:
Universal Boot Loader (U-Boot)
Universal Boot Loader (U-Boot)
Detailed vulnerability description
The vulnerability allows a local authenticated user to execute arbitrary code.
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.
How to mitigate CVE-2018-3968
Install update from vendor's website.