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CVE-2021-43860— Permissions granted to applications can be hidden from the user at install time

Quick assessment

Affected
flatpak flatpak
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.

Flatpak是一套用于Linux桌面应用计算机环境的应用程序虚拟化系统。 Flatpak 存在安全漏洞，该漏洞源于 Flatpak 不会正确验证在安装时显示给用户的应用程序权限是否与在运行时授予应用程序的实际权限相匹配，以防应用程序的元数据文件。

CVSS 8.2 · High EPSS 1.35% · P70
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I. Basic Information for CVE-2021-43860

Vulnerability Information
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Vulnerability Title
Permissions granted to applications can be hidden from the user at install time
Source: CVE Program / CVE List V5
Vulnerability Description
Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the "xa.metadata" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the "metadata" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Flatpak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flatpak是一套用于Linux桌面应用计算机环境的应用程序虚拟化系统。 Flatpak 存在安全漏洞，该漏洞源于 Flatpak 不会正确验证在安装时显示给用户的应用程序权限是否与在运行时授予应用程序的实际权限相匹配，以防应用程序的元数据文件。
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
flatpak flatpak >= 1.11.0, < 1.12.3 -

II. Public POCs for CVE-2021-43860

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III. Intelligence Information for CVE-2021-43860

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Patches & Fixes for CVE-2021-43860 (4)

Vendor Advisories for CVE-2021-43860 (3)

Mailing List Discussions for CVE-2021-43860 (1)

Other References for CVE-2021-43860 (2)

IV. Related Vulnerabilities

Same product: flatpak
Same vendor: flatpak
Same weakness: CWE-269

V. Comments for CVE-2021-43860

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