CVE-2022-21682— Flatpak 路径遍历漏洞
一分钟漏洞结论
影响对象
flatpak flatpak
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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。
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一、 漏洞 CVE-2022-21682 基础信息
漏洞信息
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Vulnerability Title
flatpak-builder can access files outside the build directory.
来源: 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`.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
来源: CVE Program / CVE List V5
Vulnerability Title
Flatpak 路径遍历漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2022-21682 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-21682 补丁与修复 (2)
CVE-2022-21682 厂商安全公告 (3)
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https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx x_refsource_CONFIRM
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https://security.gentoo.org/glsa/202312-12 vendor-advisory
CVE-2022-21682 邮件列表归档 (2)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IXKBERLJRYV7KXKGXOLI6IOXVBQNN4DP/ vendor-advisory x_refsource_FEDORA
IV. Related Vulnerabilities
V. Comments for CVE-2022-21682
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