# CVE-2020-35757: Auth bypass in n/a

> Unauthenticated attackers can enable root ADB access via the web interface, gaining full control of Libre Wireless LS9 devices.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 May 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xjfq-jvgm-jj7p

## What is CVE-2020-35757?

CVE-2020-35757 is a critical authentication bypass vulnerability in n/a, published on 3 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices. There is Unauthenticated Root ADB Access Over TCP. The LS9 web interface provides functionality to access ADB over TCP. This is not enabled by default, but can be enabled by sending a crafted request to a web management interface endpoint. Requests made to this endpoint do not require authentication. As such, any unauthenticated user who is able to access the web interface will be able to gain root privileges on the LS9 module.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2020-35757?

It affects 1 product.


Products: Librewireless Ls9 Firmware.

## How do I fix CVE-2020-35757?

No fix has been published for CVE-2020-35757 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35757 being exploited?

There is no known exploitation of CVE-2020-35757 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-35758](https://insights.sbomify.com/CVE-2020-35758/): Auth bypass in n/a (critical 9.8)
- [CVE-2020-35755](https://insights.sbomify.com/CVE-2020-35755/): Information disclosure in n/a (high 7.5)
- [CVE-2020-35756](https://insights.sbomify.com/CVE-2020-35756/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35757 and fix it if it is affected.

What it is: CVE-2020-35757 is a critical authentication bypass vulnerability in n/a, published on 3 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-35757 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-35757/ (Markdown: https://insights.sbomify.com/CVE-2020-35757/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35757
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35757
- OSV: https://osv.dev/vulnerability/CVE-2020-35757

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35757/
Summaries are generated and may contain mistakes; the official description above is the record.