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CVE-2020-11934— Sandbox escape vulnerability via snapctl user-open (xdg-open)

Quick assessment

Affected
Canonical 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.

Canonical snapd是英国科能（Canonical）公司的一套软件部署和包管理系统。 Canonical snapd中存在安全漏洞，该漏洞源于snapctl user-open允许在调用系统xdg-open时更改$XDG_DATA_DIRS环境变量。攻击者可利用该漏洞绕过访问限制，以控制主机系统xdg-open脚本打开URL的方式。

CVSS 5.9 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1610 · Deploy Container
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I. Basic Information for CVE-2020-11934

Vulnerability Information
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Vulnerability Title
Sandbox escape vulnerability via snapctl user-open (xdg-open)
Source: CVE Program / CVE List V5
Vulnerability Description
It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical snapd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical snapd是英国科能（Canonical）公司的一套软件部署和包管理系统。 Canonical snapd中存在安全漏洞，该漏洞源于snapctl user-open允许在调用系统xdg-open时更改$XDG_DATA_DIRS环境变量。攻击者可利用该漏洞绕过访问限制，以控制主机系统xdg-open脚本打开URL的方式。
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 snapd 2.45.1 ~ 2.45.1ubuntu0.2 -

II. Public POCs for CVE-2020-11934

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III. Intelligence Information for CVE-2020-11934

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Vendor Advisories for CVE-2020-11934 (1)

Other References for CVE-2020-11934 (1)

IV. Related Vulnerabilities

Same product: snapd
Same vendor: Canonical

V. Comments for CVE-2020-11934

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