CVE-2022-23651: B2sdk B2-sdk-python TOCTOU Application Key Disclosure Vulnerability
MODERATECVE-2022-23651 is a MODERATE (CVSS 4.7) b2-sdk-python toctou application key disclosure vulnerability (CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition) affecting B2sdk libraries in the PyPI ecosystem. The issue involves b2-sdk-python toctou application key disclosure. Remediation is available by upgrading affected packages to version 1.14.1.
CVE-2022-23651 at a Glance
Security Impact
CVSS: 4.7
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N).
How to Fix CVE-2022-23651
To remediate this vulnerability, upgrade all affected B2sdk dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install b2sdk>=1.14.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show b2sdkHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2022-23651, inspect your installed packages using pip:
pip show b2sdkAnalyze the terminal output to locate any version of B2sdk in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.14.1), your application is affected.
Note: The pip show b2sdk command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition, where 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. In B2sdk, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2022-23651 Affected B2sdk Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
b2sdk
|
PyPI |
< 1.14.1
|
1.14.1
|
References
Frequently Asked Questions
What is CVE-2022-23651?
Which B2sdk versions are affected?
What version fixes CVE-2022-23651?
Is b2sdk affected?
What is the CVSS score of CVE-2022-23651?
What CWE is associated with CVE-2022-23651?
How can I check PyPI dependencies for CVE-2022-23651?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-p867-fxfr-ph2w",
"modified" : "2024-09-04T20:56:19Z",
"published" : "2022-02-24T12:08:24Z",
"aliases" : [ "CVE-2022-23651" ],
"summary" : "b2-sdk-python TOCTOU application key disclosure ",
"details" : "### Impact\n\nLinux 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.\n\nSDK 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.\n\nConsumers 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.\n\n### Patches\nUsers should upgrade to b2-sdk-python 1.14.1 or later.\n\n### For more information\nSee the related advisory in the [B2 Command Line Tool](https://github.com/Backblaze/B2_Command_Line_Tool), a consumer of this SDK.\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [b2-sdk-python](https://github.com/Backblaze/b2-sdk-python)\n* Email us at [security@backblaze.com](mailto:security@backblaze.com)\n",
"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"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "b2sdk"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.14.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/Backblaze/b2-sdk-python/security/advisories/GHSA-p867-fxfr-ph2w"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-23651"
}, {
"type" : "WEB",
"url" : "https://github.com/Backblaze/b2-sdk-python/commit/62476638986e5b6d7459aca5ef8ce220760226e0"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/Backblaze/b2-sdk-python"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/b2sdk/PYSEC-2022-33.yaml"
}, {
"type" : "WEB",
"url" : "https://pypi.org/project/b2sdk"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-367" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2022-02-24T12:08:24Z",
"nvd_published_at" : "2022-02-23T23:15:00Z"
}
}