# CVE-2018-12476: obs-service-extract_file's outfilename parameter allows to write files outside of package directory

> Remote attackers with repository control can overwrite local files via path traversal in obs-service-tar_scm, requiring an upgrade to mitigate.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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:** Yes
- **Published:** 27 Jan 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-7vq9-fwhq-w55p

## What is CVE-2018-12476?

CVE-2018-12476 is a medium-severity path traversal vulnerability in SUSE Factory, published on 27 Jan 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

Relative Path Traversal vulnerability in obs-service-tar_scm of SUSE Linux Enterprise Server 15; openSUSE Factory allows remote attackers with control over a repository to overwrite files on the machine of the local user if a malicious service is executed. This issue affects: SUSE Linux Enterprise Server 15 obs-service-tar_scm versions prior to 0.9.2.1537788075.fefaa74:. openSUSE Factory obs-service-tar_scm versions prior to 0.9.2.1537788075.fefaa74.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), CWE-23 (Relative Path Traversal)

## Which versions are affected by CVE-2018-12476?

It affects 1 product.


Products: Suse Obs-Service-Tar Scm.

## How do I fix CVE-2018-12476?

Upgrade to a fixed version.

## Is CVE-2018-12476 being exploited?

There is no known exploitation of CVE-2018-12476 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-12476 and fix it if it is affected.

What it is: CVE-2018-12476 is a medium-severity path traversal vulnerability in SUSE Factory, published on 27 Jan 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-2018-12476 in the wild and no public exploit code.

Affected product: SUSE Factory. 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-2018-12476/ (Markdown: https://insights.sbomify.com/CVE-2018-12476/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-12476
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-12476
- OSV: https://osv.dev/vulnerability/CVE-2018-12476

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-12476/
Summaries are generated and may contain mistakes; the official description above is the record.