b2-sdk-python TOCTOU application key disclosure
Impact
Linux and Mac releases of the SDK version 1.14.0 and below contain a key disclosure vulnerability that, in certain conditions, can be exploited by local attackers through a time-of-check-time-of-use (TOCTOU) race condition.
SDK users of the SqliteAccountInfo format are vulnerable while users of the InMemoryAccountInfo format are safe. The SqliteAccountInfo saves API keys (and bucket name-to-id mapping) in a local database file ($XDG_CONFIG_HOME/b2/account_info, ~/.b2_account_info or a user-defined path). When first created, the file is world readable and is (typically a few milliseconds) later altered to be private to the user. If the directory containing the file is readable by a local attacker then during the brief period between file creation and permission modification, a local attacker can race to open the file and maintain a handle to it. This allows the local attacker to read the contents after the file after the sensitive information has been saved to it.
Consumers of this SDK who rely on it to save data using SqliteAccountInfo class should upgrade to the latest version of the SDK. Those who believe a local user might have opened a handle using this race condition, should remove the affected database files and regenerate all application keys.
Patches
Users should upgrade to b2-sdk-python 1.14.1 or later.
For more information
See the related advisory in the B2 Command Line Tool, a consumer of this SDK.
If you have any questions or comments about this advisory:
- Open an issue in b2-sdk-python
- Email us at security@backblaze.com
Betroffene Software
Klicken Sie auf eine Technologie, um alle zugehörigen Schwachstellen anzuzeigen.
| Plattform | Paket | Anfällige Versionen | Behoben in |
|---|---|---|---|
| Python (PyPI) | b2sdk | < 1.14.1 | 1.14.1 |
Verweise
- https://github.com/Backblaze/b2-sdk-python/commit/62476638986e5b6d7459aca5ef8ce220760226e0
- https://pypi.org/project/b2sdk/
- https://github.com/Backblaze/b2-sdk-python/security/advisories/GHSA-p867-fxfr-ph2w
- https://nvd.nist.gov/vuln/detail/CVE-2022-23651
- https://github.com/Backblaze/b2-sdk-python
- https://github.com/pypa/advisory-database/tree/main/vulns/b2sdk/PYSEC-2022-33.yaml
- https://pypi.org/project/b2sdk
- CVSS-Vektor
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N- Schwäche (CWE)
CWE-367- Plattform
- Python (PyPI)
- Paket
b2sdk- Veröffentlicht
- 23.02.2022
- Aktualisiert
- 11.10.2026 11:19
Quellen und Lizenzen
OSV / GitHub Advisory Database - PYSEC-2022-33 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-p867-fxfr-ph2w - CC BY 4.0
Schwachstellenhistorie: b2sdk
Alle veröffentlichten Schwachstellen dieses Pakets (Python (PyPI)), neueste zuerst. Zeigt, ob es ein einmaliger Ausrutscher ist oder ein Paket, das man im Auge behalten muss.
Dies ist die einzige bekannte Schwachstelle dieses Pakets.
Erkennen Sie Schwachstellen in Ihrer Anwendung
Mit der DockRay-Integration und aktivierter Softwareinventarisierung prüft DockRay gemeldete Komponentenversionen auf bekannte Schwachstellen und benachrichtigt Sie über bestätigte Treffer. Die Abdeckung hängt von der unterstützten Technologie und den verfügbaren Meldungen ab.