|Description||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.|
|Source||CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)|
|NVD severity||medium (attack range: local)|
Vulnerable and fixed packages
The table below lists information on source packages.
|bullseye, sid, buster||2019.01+dfsg-7||vulnerable|
The information below is based on the following data on fixed versions.
|Package||Type||Release||Fixed Version||Urgency||Origin||Debian Bugs|
[wheezy] - u-boot <not-affected> (Vulnerable code do not exist)
jessie+ no built targets use ENV_AES by default, but fw_printenv/fw_setenv
in u-boot-tools supports it. Upstream has deprecated it and plans to remove
it in future versions.
Negligible security impact