# CVE-2020-11827: Privilege escalation in n/a

> An attacker can replace the GalaxyClientService executable with malicious code to execute arbitrary commands with SYSTEM privileges.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-q2mw-237c-cpjv

## What is CVE-2020-11827?

CVE-2020-11827 is a high-severity vulnerability in n/a, published on 14 Jul 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In GOG Galaxy 1.2.67, there is a service that is vulnerable to weak file/service permissions: GalaxyClientService.exe. An attacker can put malicious code in a Trojan horse GalaxyClientService.exe. After that, the attacker can re-start this service as an unprivileged user to escalate his/her privileges and run commands on the machine with SYSTEM rights.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2020-11827?

It affects 1 product.


Products: Gog Galaxy.

## How do I fix CVE-2020-11827?

No fix has been published for CVE-2020-11827 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-11827 being exploited?

There is no known exploitation of CVE-2020-11827 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-4048](https://insights.sbomify.com/CVE-2018-4048/): Privilege escalation in GOG Galaxy (critical 9.3)
- [CVE-2018-3974](https://insights.sbomify.com/CVE-2018-3974/): Privilege escalation in GOG Galaxy (critical 9.3)
- [CVE-2018-4049](https://insights.sbomify.com/CVE-2018-4049/): Privilege escalation in GOG Galaxy (critical 9.3)
- [CVE-2020-7352](https://insights.sbomify.com/CVE-2020-7352/): GOG Galaxy GalaxyClientService Privilege Escalation (high 8.4)
- [CVE-2022-31262](https://insights.sbomify.com/CVE-2022-31262/): Privilege escalation in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11827 and fix it if it is affected.

What it is: CVE-2020-11827 is a high-severity vulnerability in n/a, published on 14 Jul 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-2020-11827 in the wild and no public exploit code.

Affected product: n/a. 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-2020-11827/ (Markdown: https://insights.sbomify.com/CVE-2020-11827/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11827
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11827
- OSV: https://osv.dev/vulnerability/CVE-2020-11827

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11827/
Summaries are generated and may contain mistakes; the official description above is the record.