| Name | CVE-2017-3226 |
| 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 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| u-boot (PTS) | jessie | 2014.10+dfsg1-5 | vulnerable |
| stretch | 2016.11+dfsg1-4 | vulnerable |
| buster | 2019.01+dfsg-7 | vulnerable |
| bullseye, sid | 2020.01+dfsg-2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| u-boot | source | (unstable) | (unfixed) | unimportant | | |
| u-boot | source | wheezy | (not affected) | | | |
Notes
[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.
https://www.kb.cert.org/vuls/id/166743
Negligible security impact