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CVE-2021-3429— sensitive data exposure in cloud-init logs

Quick assessment

Affected
Canonical Ltd. cloud-init
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.

Cloud-init是一款用于云平台的虚拟机初始化工具。 Cloud-init 存在日志信息泄露漏洞，攻击者可利用该漏洞可以通过非散列生成的cloud-init密码绕过限制，以升级他的特权。

CVSS 5.5 · Medium EPSS 0.22% · P11

Possible ATT&CK Techniques 2 AI

T1003 · OS Credential Dumping T1155
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I. Basic Information for CVE-2021-3429

Vulnerability Information
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Vulnerability Title
sensitive data exposure in cloud-init logs
Source: CVE Program / CVE List V5
Vulnerability Description
When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Cloud-init 日志信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloud-init是一款用于云平台的虚拟机初始化工具。 Cloud-init 存在日志信息泄露漏洞，攻击者可利用该漏洞可以通过非散列生成的cloud-init密码绕过限制，以升级他的特权。
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
Canonical Ltd. cloud-init 0 ~ 21.2 -

II. Public POCs for CVE-2021-3429

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III. Intelligence Information for CVE-2021-3429

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Patches & Fixes for CVE-2021-3429 (1)

IV. Related Vulnerabilities

Same product: cloud-init
Same vendor: Canonical Ltd.
Same weakness: CWE-532

V. Comments for CVE-2021-3429

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