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CVE-2022-23651— b2-sdk-python TOCTOU application key disclosure

Quick assessment

Affected
Backblaze b2-sdk-python
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

b2-sdk-python是一个用于访问 B2 云存储的 Python 库。 b2-sdk-python 存在安全漏洞，该漏洞源于在某些情况下，本地攻击者可以通过时间检查使用时间 (TOCTOU) 竞争条件利用该漏洞。

CVSS 4.7 · Medium EPSS 0.22% · P12
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I. Basic Information for CVE-2022-23651

Vulnerability Information
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Vulnerability Title
b2-sdk-python TOCTOU application key disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
b2-sdk-python is a python library to access cloud storage provided by backblaze. 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. Users should upgrade to b2-sdk-python 1.14.1 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
b2-sdk-python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
b2-sdk-python是一个用于访问 B2 云存储的 Python 库。 b2-sdk-python 存在安全漏洞，该漏洞源于在某些情况下，本地攻击者可以通过时间检查使用时间 (TOCTOU) 竞争条件利用该漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Backblaze b2-sdk-python < 1.14.1 -

II. Public POCs for CVE-2022-23651

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III. Intelligence Information for CVE-2022-23651

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Patches & Fixes for CVE-2022-23651 (1)

Vendor Advisories for CVE-2022-23651 (1)

Other References for CVE-2022-23651 (1)

IV. Related Vulnerabilities

Same vendor: Backblaze
Same weakness: CWE-367

V. Comments for CVE-2022-23651

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