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CVE-2021-44731— snapd could be made to escalate privileges and run programs as administrator

Quick assessment

Affected
Canonical Ltd. snapd
Exploitation
Public or AI PoC available; prioritize validation
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版本存在竞争条件问题漏洞，该漏洞源于当为snap准备私有挂载命名空间时，snap2.54.2 snap- restricted二进制文件中存在一个竞争条件。这可能允许本地攻击者可利用该漏洞通过在snap的私有挂载名称空间中绑定挂载自己的内容，从而获得根权限，并执行任意代码，从而获得权限升级。

CVSS 7.8 · High EPSS 0.95% · P60
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I. Basic Information for CVE-2021-44731

Vulnerability Information
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Vulnerability Title
snapd could be made to escalate privileges and run programs as administrator
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Snapd 竞争条件问题漏洞
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版本存在竞争条件问题漏洞，该漏洞源于当为snap准备私有挂载命名空间时，snap2.54.2 snap- restricted二进制文件中存在一个竞争条件。这可能允许本地攻击者可利用该漏洞通过在snap的私有挂载名称空间中绑定挂载自己的内容，从而获得根权限，并执行任意代码，从而获得权限升级。
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-2021-44731

# POC Description Source Link Shenlong Link
1 Local Privilege Escalation Exploit for CVE-2021-44731 https://github.com/deeexcee-io/CVE-2021-44731-snap-confine-SUID POC Details
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III. Intelligence Information for CVE-2021-44731

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Vendor Advisories for CVE-2021-44731 (2)

Exploits & Public PoCs for CVE-2021-44731 (1)

Mailing List Discussions for CVE-2021-44731 (6)

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-2021-3155 3.8 LOW snapd created ~/snap with too-wide permissions

IV. Related Vulnerabilities

Same product: snapd
Same vendor: Canonical Ltd.
Same weakness: CWE-362

V. Comments for CVE-2021-44731

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