# CVE-2018-19987: Command injection in n/a

> Attackers can execute arbitrary commands on D-Link routers via the HNAP interface due to insufficient input validation in the SetAccessPointMode function.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** 13 May 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-2mwp-h2mc-x28f

## What is CVE-2018-19987?

CVE-2018-19987 is a critical command injection vulnerability in n/a, published on 13 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

D-Link DIR-822 Rev.B 202KRb06, DIR-822 Rev.C 3.10B06, DIR-860L Rev.B 2.03.B03, DIR-868L Rev.B 2.05B02, DIR-880L Rev.A 1.20B01_01_i3se_BETA, and DIR-890L Rev.A 1.21B02_BETA devices mishandle IsAccessPoint in /HNAP1/SetAccessPointMode. In the SetAccessPointMode.php source code, the IsAccessPoint parameter is saved in the ShellPath script file without any regex checking. After the script file is executed, the command injection occurs. A vulnerable /HNAP1/SetAccessPointMode XML message could have shell metacharacters in the IsAccessPoint element such as the `telnetd` string.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2018-19987?

It affects 7 products.


Products: D-Link Dir-818lw Firmware, D-Link Dir-822 Firmware, D-Link Dir-860l Firmware, D-Link Dir-868l Firmware, D-Link Dir-880l Firmware, D-Link Dir-890l\/R Firmware, Dlink Dir-822 Firmware.

## How do I fix CVE-2018-19987?

No fix has been published for CVE-2018-19987 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-19987 being exploited?

There is no known exploitation of CVE-2018-19987 in the wild and no public exploit code.

Public exploit code:

- This repo has a blog post about my analysis for CVE-2018-19987 an authenticated OS command injection affecting multiple D-Link routers (github_poc): https://github.com/nahueldsanchez/blogpost_cve-2018-19987-analysis

## Other vulnerabilities in n/a

- [CVE-2018-19986](https://insights.sbomify.com/CVE-2018-19986/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-19987 and fix it if it is affected.

What it is: CVE-2018-19987 is a critical command injection vulnerability in n/a, published on 13 May 2019. 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-2018-19987 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-2018-19987/ (Markdown: https://insights.sbomify.com/CVE-2018-19987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-19987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-19987
- OSV: https://osv.dev/vulnerability/CVE-2018-19987

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-19987/
Summaries are generated and may contain mistakes; the official description above is the record.