# CVE-2020-27643: Path traversal in n/a

> Authenticated users can escalate privileges by creating junction points in the 1E Client directory to modify protected system files.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7wjq-q3c8-8q2h

## What is CVE-2020-27643?

CVE-2020-27643 is a medium-severity path traversal vulnerability in n/a, published on 29 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The %PROGRAMDATA%\1E\Client directory in 1E Client 5.0.0.745 and 4.1.0.267 allows remote authenticated users and local users to create and modify files in protected directories (where they would not normally have access to create or modify files) via the creation of a junction point to a system directory. This leads to partial privilege escalation.

Weakness: CWE-59 (Improper Link Resolution Before File Access)

## Which versions are affected by CVE-2020-27643?

It affects 1 product.


Products: 1e Client.

## How do I fix CVE-2020-27643?

No fix has been published for CVE-2020-27643 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27643 being exploited?

There is no known exploitation of CVE-2020-27643 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-45160](https://insights.sbomify.com/CVE-2023-45160/): Elevated Temp Directory Execution in 1E Client (high 8.8)
- [CVE-2020-16268](https://insights.sbomify.com/CVE-2020-16268/): Privilege escalation in n/a (high 8.8)
- [CVE-2020-27644](https://insights.sbomify.com/CVE-2020-27644/): Privilege escalation in n/a (high 8.8)
- [CVE-2020-27645](https://insights.sbomify.com/CVE-2020-27645/): Privilege escalation in n/a (high 8.8)
- [CVE-2023-45159](https://insights.sbomify.com/CVE-2023-45159/): 1E Client installer can perform arbitrary file deletion on protected files (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27643 and fix it if it is affected.

What it is: CVE-2020-27643 is a medium-severity path traversal vulnerability in n/a, published on 29 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-27643 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-2020-27643/ (Markdown: https://insights.sbomify.com/CVE-2020-27643/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27643
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27643
- OSV: https://osv.dev/vulnerability/CVE-2020-27643

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27643/
Summaries are generated and may contain mistakes; the official description above is the record.