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CVE-2021-3155— snapd created ~/snap with too-wide permissions

Quick assessment

Affected
Canonical Ltd. snapd
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.

Snapd是开源的一个跨平台的包管理工具。 snapd 2.54.2及其更早版本存在安全漏洞，该漏洞源于软件在用户的主目录中创建~ snap目录，而没有指定仅属于所有者的权限。这可能允许本地攻击者可利用该漏洞读取本应是私有的信息。

CVSS 3.8 · Low EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-3155

Vulnerability Information
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Vulnerability Title
snapd created ~/snap with too-wide permissions
Source: CVE Program / CVE List V5
Vulnerability Description
snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions. This could allow a local attacker to read information that should have been private. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
snapd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Snapd是开源的一个跨平台的包管理工具。 snapd 2.54.2及其更早版本存在安全漏洞，该漏洞源于软件在用户的主目录中创建~ snap目录，而没有指定仅属于所有者的权限。这可能允许本地攻击者可利用该漏洞读取本应是私有的信息。
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. snapd unspecified ~ 2.54.2 -

II. Public POCs for CVE-2021-3155

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III. Intelligence Information for CVE-2021-3155

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Patches & Fixes for CVE-2021-3155 (2)

Vendor Advisories for CVE-2021-3155 (1)

Same Patch Batch · Canonical Ltd. · 2022-02-17 · 4 CVEs total

CVE-2021-4120 8.2 HIGH snapd could be made to bypass intended access restrictions through snap content interfaces
CVE-2021-44730 7.8 HIGH snapd could be made to escalate privileges and run programs as administrator
CVE-2021-44731 7.8 HIGH snapd could be made to escalate privileges and run programs as administrator

IV. Related Vulnerabilities

Same product: snapd
Same vendor: Canonical Ltd.
Same weakness: CWE-276

V. Comments for CVE-2021-3155

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