Path traversal in Onionshare
Between September 26, 2021 and October 8, 2021, Radically Open Security conducted a penetration test of OnionShare 2.4, funded by the Open Technology Fund's Red Team lab. This is an issue from that penetration test.
- Vulnerability ID: OTF-013
- Vulnerability type: Improper Hardening
- Threat level: Low
Description:
The filesystem restriction could be hardened and should only allow for pre-defined subfolders.
Technical description:
The Flatpak and Snap configurations allow for read-only access on the whole home folder. The relevant lines in the configuration files are onionshare/snap/snapcraft.yaml#L20 and onionshare/flatpak/org.onionshare.OnionShare.yaml#L19 , respectively.
The encapsulation of filesystem access via these mechanisms should be restricted to pre-defined folders and not allow for access to (configuration) files outside the Onionshare-specific folders.
Sadly Snap does not allow for further restriction to specific folders and therefore cannot be further hardened. By default both frameworks disallow access to hidden folders and therefore reduce the potential impact.
Impact:
An adversary with a primitive that allows for filesystem access from the context of the Onionshare process can access sensitive files in the entire user home folder. This could lead to the leaking of sensitive data. Due to the automatic exclusion of hidden folders, the impact is reduced.
Recommendation:
- Reduce read access in Flatpak configuration.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | onionshare-cli | >= 2.3, < 2.5 | 2.5 |
References
- https://github.com/onionshare/onionshare/releases/tag/v2.5
- https://github.com/onionshare/onionshare/security/advisories/GHSA-jgm9-xpfj-4fq6
- https://nvd.nist.gov/vuln/detail/CVE-2022-21693
- https://github.com/onionshare/onionshare
- https://github.com/pypa/advisory-database/tree/main/vulns/onionshare-cli/PYSEC-2022-44.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N- Weakness (CWE)
CWE-22- Platform
- Python (PyPI)
- Package
onionshare-cli- Disclosed
- 18.01.2022
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2022-44 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-jgm9-xpfj-4fq6 - CC BY 4.0
Vulnerability history: onionshare-cli
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 13
- First → latest
- 11.2021 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 10
Disclosures per year
- 2021: 2
- 2022: 9
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 2
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Path traversal in Onionshare this entry
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