# CVE-2023-2790: TOTOLINK N200RE Telnet Service custom.conf password in configuration file

> Attackers with local access can read the Telnet password from the configuration file, bypassing authentication on TOTOLINK N200RE routers.

- **Severity:** Low 2.3 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 May 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-f83j-6rqj-vhpw

## What is CVE-2023-2790?

CVE-2023-2790 is a low-severity vulnerability in TOTOLINK N200RE, published on 18 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability classified as problematic has been found in TOTOLINK N200RE 9.3.5u.6255_B20211224. Affected is an unknown function of the file /squashfs-root/etc_ro/custom.conf of the component Telnet Service. The manipulation leads to password in configuration file. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. VDB-229374 is the identifier assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-260 (Password in Configuration File)

## Which versions are affected by CVE-2023-2790?

It affects 1 product.


Products: Totolink N200re Firmware.

## How do I fix CVE-2023-2790?

No fix has been published for CVE-2023-2790 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2790 being exploited?

There is no known exploitation of CVE-2023-2790 in the wild and no public exploit code.

## Other vulnerabilities in TOTOLINK N200RE

- [CVE-2024-0296](https://insights.sbomify.com/CVE-2024-0296/): Totolink N200RE cstecgi.cgi NTPSyncWithHost os command injection (high 7.3)
- [CVE-2024-0297](https://insights.sbomify.com/CVE-2024-0297/): Totolink N200RE cstecgi.cgi UploadFirmwareFile os command injection (high 7.3)
- [CVE-2024-0298](https://insights.sbomify.com/CVE-2024-0298/): Totolink N200RE cstecgi.cgi setDiagnosisCfg os command injection (high 7.3)
- [CVE-2024-0299](https://insights.sbomify.com/CVE-2024-0299/): Totolink N200RE cstecgi.cgi setTracerouteCfg os command injection (high 7.3)
- [CVE-2024-0997](https://insights.sbomify.com/CVE-2024-0997/): Totolink N200RE cstecgi.cgi setOpModeCfg stack-based overflow (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2790 and fix it if it is affected.

What it is: CVE-2023-2790 is a low-severity vulnerability in TOTOLINK N200RE, published on 18 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-2790 in the wild and no public exploit code.

Affected product: TOTOLINK N200RE. 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-2023-2790/ (Markdown: https://insights.sbomify.com/CVE-2023-2790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2790
- OSV: https://osv.dev/vulnerability/CVE-2023-2790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2790/
Summaries are generated and may contain mistakes; the official description above is the record.