CVE-2021-44731— snapd could be made to escalate privileges and run programs as administrator
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
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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- https://www.debian.org/security/2022/dsa-5080vendor-advisory
- http://seclists.org/fulldisclosure/2022/Dec/4mailing-list
- https://nvd.nist.gov/vuln/detail/CVE-2021-44731
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
V. Comments for CVE-2021-44731
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