# CVE-2018-19960: Path traversal in n/a

> Local attackers can overwrite files or read sensitive data via a predictable log path when debug mode is enabled in OnionShare.

- **Severity:** High 7.0 (`CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Dec 2018
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2018-19960, UBUNTU-CVE-2018-19960, openSUSE-SU-2024:11246-1

## What is CVE-2018-19960?

CVE-2018-19960 is a high-severity path traversal vulnerability in n/a, published on 7 Dec 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The debug_mode function in web/web.py in OnionShare through 1.3.1, when --debug is enabled, uses the /tmp/onionshare_server.log pathname for logging, which might allow local users to overwrite files or obtain sensitive information by using this pathname.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-19960?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `python-onionshare` | openSUSE:Tumbleweed | All versions | 2.3.3-2.5 |

Products: Onionshare Onionshare.

## How do I fix CVE-2018-19960?

Apply the vendor's patch.

## Is CVE-2018-19960 being exploited?

There is no known exploitation of CVE-2018-19960 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-41868](https://insights.sbomify.com/CVE-2021-41868/): Remote unauthenticated attackers able to upload files in Onionshare (critical 9.8)
- [CVE-2022-21690](https://insights.sbomify.com/CVE-2022-21690/): Cross-Site Scripting in Onionshare (high 8.7)
- [CVE-2022-21688](https://insights.sbomify.com/CVE-2022-21688/): Out-of-bounds Read in Onionshare (high 7.5)
- [CVE-2022-21689](https://insights.sbomify.com/CVE-2022-21689/): Denial of Service in Onionshare (high 7.5)
- [CVE-2022-21693](https://insights.sbomify.com/CVE-2022-21693/): Path traversal in Onionshare (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-19960 and fix it if it is affected.

What it is: CVE-2018-19960 is a high-severity path traversal vulnerability in n/a, published on 7 Dec 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-19960 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-2018-19960/ (Markdown: https://insights.sbomify.com/CVE-2018-19960/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-19960
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-19960
- OSV: https://osv.dev/vulnerability/CVE-2018-19960

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-19960/
Summaries are generated and may contain mistakes; the official description above is the record.