# CVE-2021-34422: Path traversal of file names in Keybase Client for Windows

> A path traversal flaw in Keybase Client for Windows allows attackers to execute arbitrary code via crafted filenames in shared folders.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Nov 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-rr44-rmpx-9h3q

## What is CVE-2021-34422?

CVE-2021-34422 is a high-severity path traversal vulnerability in Zoom Video Communications Inc Keybase Client for Windows, published on 11 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Keybase Client for Windows before version 5.7.0 contains a path traversal vulnerability when checking the name of a file uploaded to a team folder. A malicious user could upload a file to a shared folder with a specially crafted file name which could allow a user to execute an application which was not intended on their host machine. If a malicious user leveraged this issue with the public folder sharing feature of the Keybase client, this could lead to remote code execution.

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

## Which versions are affected by CVE-2021-34422?

It affects 1 product.


Products: Keybase Keybase.

## How do I fix CVE-2021-34422?

No fix has been published for CVE-2021-34422 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34422 being exploited?

There is no known exploitation of CVE-2021-34422 in the wild and no public exploit code.

## Other vulnerabilities in Zoom Video Communications Inc Keybase Client for Windows

- [CVE-2019-7249](https://insights.sbomify.com/CVE-2019-7249/): Race condition in n/a (critical 9.8)
- [CVE-2018-18629](https://insights.sbomify.com/CVE-2018-18629/): Privilege escalation in n/a (high 7.8)
- [CVE-2019-16992](https://insights.sbomify.com/CVE-2019-16992/): Other in n/a (high 7.5)
- [CVE-2021-23827](https://insights.sbomify.com/CVE-2021-23827/): Information disclosure in n/a (medium 5.5)
- [CVE-2021-34426](https://insights.sbomify.com/CVE-2021-34426/): Arbitrary command execution in Keybase Client for Windows (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34422 and fix it if it is affected.

What it is: CVE-2021-34422 is a high-severity path traversal vulnerability in Zoom Video Communications Inc Keybase Client for Windows, published on 11 Nov 2021. 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-2021-34422 in the wild and no public exploit code.

Affected product: Zoom Video Communications Inc Keybase Client for Windows. 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-2021-34422/ (Markdown: https://insights.sbomify.com/CVE-2021-34422/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34422
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34422
- OSV: https://osv.dev/vulnerability/CVE-2021-34422

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-34422/
Summaries are generated and may contain mistakes; the official description above is the record.