CVE-2018-3968 — Improper Verification of Cryptographic Signature in U-boot

CWE-347 — Improper Verification of Cryptographic Signature5 documents5 sources

Severity

7.0HIGHNVD

EPSS

0.0%

top 92.02%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Denx U-boot Debian U-boot

Timeline

PublishedMar 21

Latest updateMay 13

Description

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.

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.0 | Impact: 5.9

Affected Packages3 packages

▶debiandebian/u-boot< u-boot 2014.07+dfsg1-1 (bookworm)

▶Debiandenx/u-boot< 2014.07+dfsg1-1+3

▶NVDdenx/u-boot2013.07 — 2014.07+2

🔴Vulnerability Details

GHSA

GHSA-xjmf-xr2j-gfx7: An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013↗2022-05-13

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OSV

CVE-2018-3968: An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013↗2019-03-21

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📋Vendor Advisories

Debian

CVE-2018-3968: u-boot - An exploitable vulnerability exists in the verified boot protection of the Das U...↗2018

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🕵️Threat Intelligence

Talos

Vulnerability Spotlight: Multiple Vulnerabilities in CUJO Smart Firewall, Das U-Boot, OCTEON SDK, Webroot BrightCloud↗2019-03-19

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