{"id":"GHSA-8wr4-2wm6-w3pr","summary":"B2 Command Line Tool TOCTOU application key disclosure ","details":"### Impact\n\nLinux 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.\n\nThe 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.\n\n### Remediation\n\nUsers that have not yet run `b2 authorize-account` should upgrade to B2 Command-Line Tool v3.2.1 before running it.\n\nUsers 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.\n\nUsers 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.\n\n### Workarounds\nIf 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.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [B2 Command-Line Tool](https://github.com/Backblaze/B2_Command_Line_Tool) mentioning the CVE id in the issue title\n* Email us at [security@backblaze.com](mailto:security@backblaze.com)\n","aliases":["CVE-2022-23653","PYSEC-2022-32"],"modified":"2024-09-04T21:01:44.685381Z","published":"2022-02-24T13:11:51Z","database_specific":{"github_reviewed_at":"2022-02-24T13:11:51Z","nvd_published_at":"2022-02-23T23:15:00Z","cwe_ids":["CWE-367"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/Backblaze/B2_Command_Line_Tool/security/advisories/GHSA-8wr4-2wm6-w3pr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-23653"},{"type":"WEB","url":"https://github.com/Backblaze/B2_Command_Line_Tool/commit/c74029f9f75065e8f7e3c3ec8e0a23fb8204feeb"},{"type":"WEB","url":"https://github.com/Backblaze/B2_Command_Line_Tool"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/b2/PYSEC-2022-32.yaml"}],"affected":[{"package":{"name":"b2","ecosystem":"PyPI","purl":"pkg:pypi/b2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1"}]}],"versions":["0.0.0","0.3.14","0.4.0","0.4.10","0.4.2","0.4.4","0.4.6","0.4.8","0.5.0","0.5.2","0.5.4","0.5.6","0.6.0","0.6.2","0.6.4","0.6.6","0.6.8","0.7.0","0.7.2","0.7.4","1.0.0","1.1.0","1.2.0","1.3.0","1.3.2","1.3.4","1.3.6","1.3.8","1.4.0","1.4.2","2.0.0","2.0.2","2.1.0","2.2.0","2.3.0","2.4.0","2.5.0","2.5.1","3.0.0","3.0.1","3.0.2","3.0.3","3.1.0","3.2.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-8wr4-2wm6-w3pr/GHSA-8wr4-2wm6-w3pr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}