Vulnerability in Das U-Boot
CVE-2017-3226
Das U-Boot is a device bootloader that can read its configuration from an AES encrypted file. Devices that make use of Das U-Boot's AES-CBC encryption feature using environment encryption (i.e., setting the configuration parameter CONFIG_ENV_AES=y) read environment variables from disk as the encrypted disk image is processed. An attacker with physical access to the device can manipulate the encrypted environment data to include a crafted two-byte sequence which triggers an error in environment variable parsing. This error condition is improperly handled by Das U-Boot, resulting in an immediate process termination with a debugging message.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
- Das U-Boot — versions 2017.09
- Denx U-Boot
Weakness classification (CWE)
References
- www.securityfocus.com/bid/100675 (VDB Entry, Third Party Advisory, vdb-entry)
- www.kb.cert.org/vuls/id/166743 (US Government Resource, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2017-3226?
- CVE-2017-3226 is a medium-severity vulnerability in Das U-Boot, classified under Generation of Predictable IV with CBC Mode. CVSS score: 6.4/10. Published 2018-07-24.
- How severe is CVE-2017-3226?
- Medium severity. CVSS v3 base score is 6.4 out of 10.