# CVE-2020-9291: Privilege escalation in Fortinet FortiClient for Windows

> A local attacker can gain elevated privileges on FortiClient for Windows by exploiting an insecure temporary file vulnerability via symbolic link attacks.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **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:** 1 Jun 2020
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-qrcx-r22r-r6xm

## What is CVE-2020-9291?

CVE-2020-9291 is a medium-severity vulnerability in Fortinet Forticlient, published on 1 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An Insecure Temporary File vulnerability in FortiClient for Windows 6.2.1 and below may allow a local user to gain elevated privileges via exhausting the pool of temporary file names combined with a symbolic link attack.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere)

## Which versions are affected by CVE-2020-9291?

It affects 1 product.


Products: Fortinet Forticlient.

## How do I fix CVE-2020-9291?

No fix has been published for CVE-2020-9291 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-9291 being exploited?

There is no known exploitation of CVE-2020-9291 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet Forticlient

- [CVE-2019-17658](https://insights.sbomify.com/CVE-2019-17658/): Privilege escalation in Fortinet FortiClientWindows (critical 9.8)
- [CVE-2023-45590](https://insights.sbomify.com/CVE-2023-45590/): Code injection in FortiClientLinux (critical 9.4)
- [CVE-2017-14184](https://insights.sbomify.com/CVE-2017-14184/): Information disclosure in FortiClient SSLVPN Client for Linux (high 8.8)
- [CVE-2016-8493](https://insights.sbomify.com/CVE-2016-8493/): Privilege escalation in Fortinet FortiClient (high 8.8)
- [CVE-2020-15934](https://insights.sbomify.com/CVE-2020-15934/): Privilege escalation in FortiClientLinux (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-9291 and fix it if it is affected.

What it is: CVE-2020-9291 is a medium-severity vulnerability in Fortinet Forticlient, published on 1 Jun 2020. 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-2020-9291 in the wild and no public exploit code.

Affected product: Fortinet Forticlient. 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-2020-9291/ (Markdown: https://insights.sbomify.com/CVE-2020-9291/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-9291
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-9291
- OSV: https://osv.dev/vulnerability/CVE-2020-9291

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-9291/
Summaries are generated and may contain mistakes; the official description above is the record.