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CVE-2022-21682— flatpak-builder can access files outside the build directory.

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 1.12.3和1.10.6之前版本存在安全漏洞，攻击者可利用该漏洞通过恶意应用程序替换appstream util二进制文件，并可能执行其他恶意操作。

CVSS 7.7 · High EPSS 1.68% · P76
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I. Basic Information for CVE-2022-21682

Vulnerability Information
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Vulnerability Title
flatpak-builder can access files outside the build directory.
Source: CVE Program / CVE List V5
Vulnerability Description
Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies `finish-args` last in the build. At this point the build directory will have the full access that is specified in the manifest, so running `flatpak build` against it will gain those permissions. Normally this will not be done, so this is not problem. However, if `--mirror-screenshots-url` is specified, then flatpak-builder will launch `flatpak build --nofilesystem=host appstream-utils mirror-screenshots` after finalization, which can lead to issues even with the `--nofilesystem=host` protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the `appstream-util` binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of `--nofilesystem=home` and `--nofilesystem=host`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Flatpak 路径遍历漏洞
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 1.12.3和1.10.6之前版本存在安全漏洞，攻击者可利用该漏洞通过恶意应用程序替换appstream util二进制文件，并可能执行其他恶意操作。
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-2022-21682

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III. Intelligence Information for CVE-2022-21682

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Patches & Fixes for CVE-2022-21682 (2)

Vendor Advisories for CVE-2022-21682 (3)

Mailing List Discussions for CVE-2022-21682 (2)

IV. Related Vulnerabilities

Same product: flatpak
Same vendor: flatpak
Same weakness: CWE-22

V. Comments for CVE-2022-21682

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