CVE-2022-23653 (published 2022-02-23T23:15Z)

B2 Command Line Tool is the official command line tool for the backblaze cloud storage service. Linux and Mac releases of the B2 command-line tool version 3.2.0 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. The command line tool 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 `b2 authorize-account` is first run. This happens regardless of whether a valid key is provided or not. 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 is readable by a local attacker and the user did not yet run `b2 authorize-account` 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. Users that have not yet run `b2 authorize-account` should upgrade to B2 Command-Line Tool v3.2.1 before running it. Users that have run `b2 authorize-account` are safe if at the time of the file creation no other local users had read access to the local configuration file. Users that have run `b2 authorize-account` where the designated path could be opened by another local user should upgrade to B2 Command-Line Tool v3.2.1 and remove the database and regenerate all application keys. Note that `b2 clear-account` does not remove the database file and it should not be used to ensure that all open handles to the file are invalidated. If B2 Command-Line Tool cannot be upgraded to v3.2.1 due to a dependency conflict, a binary release can be used instead. Alternatively a new version could be installed within a virtualenv, or the permissions can be changed to prevent local users from opening the database file.

Severity: LOW
CVSS v2 base score: 1.9 (AV:L/AC:M/Au:N/C:P/I:N/A:N)
CVSS v3 base score: 4.7, MEDIUM (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N)

Weakness information:
cwe_id: CWE-367
cwe_name: Time-of-check Time-of-use (TOCTOU) Race Condition
description: The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.
extended_description: This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.
         

Fix information:
repo_url: https://github.com/Backblaze/B2_Command_Line_Tool
commit_details: repo_url: https://github.com/Backblaze/B2_Command_Line_Tool
author: Pawel Polewicz
author_date: 2022-02-23 20:20:05+01:00
msg: Release v3.2.1
repository: repo_url: https://github.com/Backblaze/B2_Command_Line_Tool
repo_name: Backblaze/B2_Command_Line_Tool
description: The command-line tool that gives easy access to all of the capabilities of B2 Cloud Storage
repo_language: Python
owner: Backblaze
file_changes: filename: CHANGELOG.md
change_type: ModificationType.MODIFY
diff: @@ -6,6 +6,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.2.1] - 2022-02-23
+
+### Fixed
+* Fix setting permissions for local sqlite database (thanks to Jan Schejbal for responsible disclosure!)
+
 ## [3.2.0] - 2021-12-23
 
 ### Added
@@ -284,8 +289,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fix an off-by-one issue when downloading a range of a file (affects library, but not CLI).
 * Better handling of some errors from the B2 service.
 
-[Unreleased]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.2.0...HEAD
-[3.1.0]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.1.0...v3.2.0
+[Unreleased]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.2.1...HEAD
+[3.2.1]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.2.0...v3.2.1
+[3.2.0]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.1.0...v3.2.0
 [3.1.0]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.0.3...v3.1.0
 [3.0.3]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.0.2...v3.0.3
 [3.0.2]: https://github.com/Backblaze/B2_Command_Line_Tool/compare/v3.0.1...v3.0.2

programming_language: Markdown
filename: requirements.txt
change_type: ModificationType.MODIFY
diff: @@ -1,6 +1,6 @@
 arrow>=0.8.0,<1.0.0; python_version <= '3.5'
 arrow>=1.0.2,<2.0.0; python_version >= '3.6'
-b2sdk>=1.14.0,<2.0.0
+b2sdk>=1.14.1,<2.0.0
 docutils==0.16
 idna>=2.2.0; platform_system == 'Java'
 importlib-metadata>=2.1.1,<3.0.0; python_version <= '3.5'

programming_language: Python