# CVE-2020-28337: Zip slip in Microweber

> An authenticated administrator can achieve remote code execution by uploading a malicious ZIP file with path traversal sequences and restoring it.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-pqcf-v8v5-jmcg

## What is CVE-2020-28337?

CVE-2020-28337 is a high-severity path traversal vulnerability in Microweber Microweber, published on 15 Feb 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A directory traversal issue in the Utils/Unzip module in Microweber through 1.1.20 allows an authenticated attacker to gain remote code execution via the backup restore feature. To exploit the vulnerability, an attacker must have the credentials of an administrative user, upload a maliciously constructed ZIP file with file paths including relative paths (i.e., ../../), move this file into the backup directory, and execute a restore on this file.

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

## Which versions are affected by CVE-2020-28337?

2 open source packages ship an affected version, including microweber/microweber. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `microweber/microweber` | Packagist | All versions | 1.2.3 |
| `microweber/microweber` | Packagist | All versions | 1.2.3 |

Products: Microweber Microweber.

## How do I fix CVE-2020-28337?

Upgrade microweber/microweber to 1.2.3 or later.

## Is CVE-2020-28337 being exploited?

There is no known exploitation of CVE-2020-28337 in the wild and no public exploit code.

Public exploit code:

- Microweber CMS 1.1.20 - Remote Code Execution (Authenticated) (exploitdb)

## Other vulnerabilities in Microweber Microweber

- [CVE-2022-0558](https://insights.sbomify.com/CVE-2022-0558/): Cross-site Scripting (XSS) - Stored in microweber/microweber (critical 9.8)
- [CVE-2020-23138](https://insights.sbomify.com/CVE-2020-23138/): File upload in n/a (critical 9.8)
- [CVE-2022-0688](https://insights.sbomify.com/CVE-2022-0688/): Business Logic Errors in microweber/microweber (critical 9.4)
- [CVE-2022-0660](https://insights.sbomify.com/CVE-2022-0660/): Generation of Error Message Containing Sensitive Information in microweber/microweber (critical 9.4)
- [CVE-2022-0913](https://insights.sbomify.com/CVE-2022-0913/): Integer Overflow or Wraparound in microweber/microweber (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-28337 and fix it if it is affected.

What it is: CVE-2020-28337 is a high-severity path traversal vulnerability in Microweber Microweber, published on 15 Feb 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-28337 in the wild and no public exploit code.

Affected packages and fixed versions:
- microweber/microweber (Packagist): affected all versions; fixed in 1.2.3
- microweber/microweber (Packagist): affected all versions; fixed in 1.2.3

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-2020-28337/ (Markdown: https://insights.sbomify.com/CVE-2020-28337/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-28337
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-28337
- OSV: https://osv.dev/vulnerability/CVE-2020-28337

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-28337/
Summaries are generated and may contain mistakes; the official description above is the record.