Cryptographic issues in Universal Boot Loader (U-Boot) - CVE-2017-3226
Published: July 24, 2018 / Updated: July 17, 2020
Vulnerability details
The vulnerability allows a local non-authenticated attacker to execute arbitrary code.
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.