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CVE-2021-44730— snapd could be made to escalate privileges and run programs as administrator

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 版本存在后置链接漏洞，该漏洞源于没有正确验证snap- restricted二进制文件的位置。本地攻击者可利用该漏洞，可以将这个二进制文件硬链接到另一个位置，从而导致snap-限制执行其他任意二进制文件，从而获得特权升级。

CVSS 7.8 · High EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-44730

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
snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries 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
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
snapd 后置链接漏洞
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 版本存在后置链接漏洞，该漏洞源于没有正确验证snap- restricted二进制文件的位置。本地攻击者可利用该漏洞，可以将这个二进制文件硬链接到另一个位置，从而导致snap-限制执行其他任意二进制文件，从而获得特权升级。
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-2021-44730

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III. Intelligence Information for CVE-2021-44730

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Vendor Advisories for CVE-2021-44730 (2)

Mailing List Discussions for CVE-2021-44730 (3)

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-2021-44731 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-59

V. Comments for CVE-2021-44730

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