# CVE-2020-6143: Code injection in OS4Ed

> Remote attackers can inject PHP code via the install password field, leading to remote code execution in openSIS.

- **Severity:** Critical 10.0 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xw4m-j84h-5g2x

## What is CVE-2020-6143?

CVE-2020-6143 is a critical code injection vulnerability in Os4ed Opensis, published on 1 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A remote code execution vulnerability exists in the install functionality of OS4Ed openSIS 7.4. The password variable which is set at line 122 in install/Step5.php allows for injection of PHP code into the Data.php file that it writes. An attacker can send an HTTP request to trigger this vulnerability.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-96 (Improper Neutralization of Directives in Statically Saved Code)

## Which versions are affected by CVE-2020-6143?

It affects 1 product.


Products: Os4ed Opensis.

## How do I fix CVE-2020-6143?

No fix has been published for CVE-2020-6143 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-6143 being exploited?

There is no known exploitation of CVE-2020-6143 in the wild and no public exploit code.

## Other vulnerabilities in Os4ed Opensis

- [CVE-2020-6144](https://insights.sbomify.com/CVE-2020-6144/): Code injection in OS4Ed (critical 10.0)
- [CVE-2020-6142](https://insights.sbomify.com/CVE-2020-6142/): Path traversal in OS4Ed (critical 9.9)
- [CVE-2021-41691](https://insights.sbomify.com/CVE-2021-41691/): SQL injection in n/a (critical 9.8)
- [CVE-2025-22926](https://insights.sbomify.com/CVE-2025-22926/): Path traversal in n/a (critical 9.8)
- [CVE-2025-22928](https://insights.sbomify.com/CVE-2025-22928/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6143 and fix it if it is affected.

What it is: CVE-2020-6143 is a critical code injection vulnerability in Os4ed Opensis, published on 1 Sep 2020. 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-2020-6143 in the wild and no public exploit code.

Affected product: Os4ed Opensis. 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-2020-6143/ (Markdown: https://insights.sbomify.com/CVE-2020-6143/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6143
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6143
- OSV: https://osv.dev/vulnerability/CVE-2020-6143

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-6143/
Summaries are generated and may contain mistakes; the official description above is the record.