Invalid root may become trusted root in The Update Framework (TUF)
Impact
The Python TUF reference implementation tuf<0.12 will incorrectly trust a previously downloaded root metadata file which failed verification at download time. This allows an attacker who is able to serve multiple new versions of root metadata (i.e. by a man-in-the-middle attack) culminating in a version which has not been correctly signed to control the trust chain for future updates.
While investigating the reported vulnerability, we discovered that the detailed client workflow was not fully implemented. Specifically, for step 1.3 the newly downloaded root metadata was not being verified with a threshold of keys specified in the new root metadata file. This missing step of the client workflow has been implemented in PR #1101, which is included in v0.14.0 of tuf.
Patches
A fix, is available in version 0.12 and newer.
Workarounds
No workarounds are known for this issue.
References
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | tuf | < 0.12.0 | 0.12.0 |
Referencias
- https://github.com/theupdateframework/tuf/releases/tag/v0.12.0
- https://github.com/theupdateframework/tuf/security/advisories/GHSA-f8mr-jv2c-v8mg
- https://github.com/theupdateframework/tuf/commit/3d342e648fbacdf43a13d7ba8886aaaf07334af7
- https://pypi.org/project/tuf
- https://github.com/theupdateframework/tuf/pull/885
- https://nvd.nist.gov/vuln/detail/CVE-2020-15163
- https://github.com/pypa/advisory-database/tree/main/vulns/tuf/PYSEC-2020-145.yaml
- https://github.com/theupdateframework/tuf
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N- Debilidad (CWE)
CWE-345, CWE-863- Plataforma
- Python (PyPI)
- Paquete
tuf- Publicada
- 09.09.2020
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2020-145 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-f8mr-jv2c-v8mg - CC BY 4.0
Historial de vulnerabilidades: tuf
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 7
- Primera → última
- 01.2020 05.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Media 4
- Baja 2
Divulgaciones por año
- 2020: 3
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 1
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Invalid root may become trusted root in The Update Framework (TUF) esta entrada
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