# CVE-2018-7933: Path traversal in HiRouter-CD20, WS5200

> Attackers can overwrite arbitrary files via malicious APK plugins, leading to code execution or privilege escalation on Huawei home gateways.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 May 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-4xmf-8wjf-4hrh

## What is CVE-2018-7933?

CVE-2018-7933 is a high-severity path traversal vulnerability in Huawei Technologies Co., Ltd. HiRouter-CD20, WS5200, published on 10 May 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Huawei home gateway products HiRouter-CD20 and WS5200 with the versions before HiRouter-CD20-10 1.9.6 and the versions before WS5200-10 1.9.6 have a path traversal vulnerability. Due to the lack of validation while these home gateway products install APK plugins, an attacker tricks a user into installing a malicious APK plugin, and plugin can overwrite arbitrary file of devices. Successful exploit may result in arbitrary code execution or privilege escalation.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2018-7933?

It affects 2 products.


Products: Huawei Hirouter-Cd20 Firmware, Huawei Ws5200 Firmware.

## How do I fix CVE-2018-7933?

No fix has been published for CVE-2018-7933 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-7933 being exploited?

There is no known exploitation of CVE-2018-7933 in the wild and no public exploit code.

## Other vulnerabilities in Huawei Technologies Co., Ltd. HiRouter-CD20, WS5200

- [CVE-2018-7937](https://insights.sbomify.com/CVE-2018-7937/): Security feature bypass in HiRouter-CD20, WS5200-10 (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-7933 and fix it if it is affected.

What it is: CVE-2018-7933 is a high-severity path traversal vulnerability in Huawei Technologies Co., Ltd. HiRouter-CD20, WS5200, published on 10 May 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-7933 in the wild and no public exploit code.

Affected product: Huawei Technologies Co., Ltd. HiRouter-CD20, WS5200. 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-2018-7933/ (Markdown: https://insights.sbomify.com/CVE-2018-7933/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7933
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7933
- OSV: https://osv.dev/vulnerability/CVE-2018-7933

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-7933/
Summaries are generated and may contain mistakes; the official description above is the record.