# CVE-2023-3747: Insufficient Validation on Override Codes for Always-Enabled WARP Mode

> Local attackers can bypass WARP security enforcement by manipulating system time to extend override code validity, requiring administrator-created override codes.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:** 7 Sep 2023
- **Updated:** 26 Sep 2024

## What is CVE-2023-3747?

CVE-2023-3747 is a medium-severity vulnerability in Cloudflare WARP Client, published on 7 Sep 2023. 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

Zero Trust Administrators have the ability to disallow end users from disabling WARP on their devices. Override codes can also be created by the Administrators to allow a device to temporarily be disconnected from WARP, however, due to lack of server side validation, an attacker with local access to the device, could extend the maximum allowed disconnected time of WARP client granted by an override code by changing the date & time on the local device where WARP is running.

Weakness: CWE-565 (Reliance on Cookies without Validation and Integrity Checking), CWE-602 (Client-Side Enforcement of Server-Side Security)

## Which versions are affected by CVE-2023-3747?

It affects 1 product.


Products: Cloudflare Warp.

## How do I fix CVE-2023-3747?

No fix has been published for CVE-2023-3747 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3747 being exploited?

There is no known exploitation of CVE-2023-3747 in the wild and no public exploit code.

## Other vulnerabilities in Cloudflare WARP Client

- [CVE-2022-4428](https://insights.sbomify.com/CVE-2022-4428/): support_uri validation missing in WARP client for Windows (high 8.9)
- [CVE-2022-2225](https://insights.sbomify.com/CVE-2022-2225/): Zero Trust Secure Web Gateway policies bypass using WARP client subcommands (high 8.1)
- [CVE-2023-2754](https://insights.sbomify.com/CVE-2023-2754/): Plaintext transmission of DNS requests in Windows 1.1.1.1 WARP client (high 7.4)
- [CVE-2023-1862](https://insights.sbomify.com/CVE-2023-1862/): Remote access to warp-svc.exe in Cloudflare WARP (high 7.3)
- [CVE-2023-0652](https://insights.sbomify.com/CVE-2023-0652/): Local Privilege Escalation in Cloudflare WARP Installer (Windows) (high 7.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3747 and fix it if it is affected.

What it is: CVE-2023-3747 is a medium-severity vulnerability in Cloudflare WARP Client, published on 7 Sep 2023. 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-2023-3747 in the wild and no public exploit code.

Affected product: Cloudflare WARP Client. 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-2023-3747/ (Markdown: https://insights.sbomify.com/CVE-2023-3747/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3747
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3747
- OSV: https://osv.dev/vulnerability/CVE-2023-3747

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3747/
Summaries are generated and may contain mistakes; the official description above is the record.