# CVE-2018-3920: Code injection in Yi Technology

> An attacker with physical access can execute arbitrary code on Yi Home Cameras by inserting a malicious SD card containing a crafted 7-Zip file.

- **Severity:** High 7.6 (`CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:C/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:** Not needed
- **Fix available:** No
- **Published:** 2 Nov 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-r65w-5jgv-h7gj

## What is CVE-2018-3920?

CVE-2018-3920 is a high-severity code injection vulnerability in unknown Yi Technology, published on 2 Nov 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An exploitable code execution vulnerability exists in the firmware update functionality of the Yi Home Camera 27US 1.8.7.0D. A specially crafted 7-Zip file can cause a CRC collision, resulting in a firmware update and code execution. An attacker can insert an SDcard to trigger this vulnerability.

## Which versions are affected by CVE-2018-3920?

It affects 1 product.


Products: Yitechnology Yi Home Camera Firmware.

## How do I fix CVE-2018-3920?

No fix has been published for CVE-2018-3920 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-3920 being exploited?

There is no known exploitation of CVE-2018-3920 in the wild and no public exploit code.

## Other vulnerabilities in unknown Yi Technology

- [CVE-2018-3892](https://insights.sbomify.com/CVE-2018-3892/): Memory corruption in Yi Technology (critical 9.6)
- [CVE-2018-3934](https://insights.sbomify.com/CVE-2018-3934/): Auth bypass in Yi Technology (critical 9.0)
- [CVE-2018-3898](https://insights.sbomify.com/CVE-2018-3898/): Memory corruption in Yi Technology (high 8.3)
- [CVE-2018-3899](https://insights.sbomify.com/CVE-2018-3899/): Memory corruption in Yi Technology (high 8.3)
- [CVE-2018-3890](https://insights.sbomify.com/CVE-2018-3890/): Command injection in Yi Technology (high 7.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-3920 and fix it if it is affected.

What it is: CVE-2018-3920 is a high-severity code injection vulnerability in unknown Yi Technology, published on 2 Nov 2018. 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-2018-3920 in the wild and no public exploit code.

Affected product: unknown Yi Technology. 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-2018-3920/ (Markdown: https://insights.sbomify.com/CVE-2018-3920/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-3920
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-3920
- OSV: https://osv.dev/vulnerability/CVE-2018-3920

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-3920/
Summaries are generated and may contain mistakes; the official description above is the record.