# CVE-2020-3926: ServiSign Windows Versions- Arbitrary File Access

> Attackers can access arbitrary files on the target system by exploiting an arbitrary file access vulnerability in the ServiSign security plugin.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Feb 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-77x4-9g68-7hxr

## What is CVE-2020-3926?

CVE-2020-3926 is a medium-severity path traversal vulnerability in CHANGING ServiSign Windows versions, published on 3 Feb 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An arbitrary-file-access vulnerability exists in ServiSign security plugin, as long as the attackers learn the specific API function, they may access arbitrary files on target system via crafted API parameter.

Weakness: CWE-552 (Files or Directories Accessible to External Parties)

## Which versions are affected by CVE-2020-3926?

It affects 1 product.


Products: Changingtec Servisign.

## How do I fix CVE-2020-3926?

No fix has been published for CVE-2020-3926 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3926 being exploited?

There is no known exploitation of CVE-2020-3926 in the wild and no public exploit code.

## Other vulnerabilities in CHANGING ServiSign Windows versions

- [CVE-2022-46304](https://insights.sbomify.com/CVE-2022-46304/): ChangingTec ServiSign - Command Injection (high 8.8)
- [CVE-2022-46306](https://insights.sbomify.com/CVE-2022-46306/): ChangingTec ServiSign - Path Traversal (high 8.8)
- [CVE-2020-3925](https://insights.sbomify.com/CVE-2020-3925/): ServiSign Windows Versions- Remote Code Execution via LoadLibrary (high 8.3)
- [CVE-2020-3927](https://insights.sbomify.com/CVE-2020-3927/): ServiSign Windows Versions- Arbitrary File Deletion (high 8.3)
- [CVE-2022-46305](https://insights.sbomify.com/CVE-2022-46305/): ChangingTec ServiSign - Path Traversal (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3926 and fix it if it is affected.

What it is: CVE-2020-3926 is a medium-severity path traversal vulnerability in CHANGING ServiSign Windows versions, published on 3 Feb 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-3926 in the wild and no public exploit code.

Affected product: CHANGING ServiSign Windows versions. 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-2020-3926/ (Markdown: https://insights.sbomify.com/CVE-2020-3926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3926
- OSV: https://osv.dev/vulnerability/CVE-2020-3926

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3926/
Summaries are generated and may contain mistakes; the official description above is the record.