CVE-2022-23653 (Other, published 2022-02-23T23:15Z)
Description: value: 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 v3 base score: 4.7)
Weakness: CWE-367 \u2014 Time-of-check Time-of-use (TOCTOU) Race Condition
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.
Repository: https://github.com/Backblaze/B2_Command_Line_Tool
Files changed:
CHANGELOG.md
requirements.txt
Commit message: Release v3.2.1


Vulnerable code:
[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
b2sdk>=1.14.0,<2.0.0

Fixed code:
## [3.2.1] - 2022-02-23

### Fixed
* Fix setting permissions for local sqlite database (thanks to Jan Schejbal for responsible disclosure!)

[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
b2sdk>=1.14.1,<2.0.0