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CVE-2021-21381— Flatpak 注入漏洞

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 存在安全漏洞,攻击者可利用该漏洞访问应用程序权限通常不允许的文件。

CVSS 7.1 · High EPSS 1.55% · P74
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一、 漏洞 CVE-2021-21381 基础信息

漏洞信息

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Vulnerability Title
Sandbox escape via special tokens in .desktop file
来源: CVE Program / CVE List V5
Vulnerability Description
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpack since version 0.9.4 and before version 1.10.2 has a vulnerability in the "file forwarding" feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app's permissions. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app's .desktop file, a malicious app publisher can trick flatpak into behaving as though the user had chosen to open a target file with their Flatpak app, which automatically makes that file available to the Flatpak app. This is fixed in version 1.10.2. A minimal solution is the first commit "`Disallow @@ and @@U usage in desktop files`". The follow-up commits "`dir: Reserve the whole @@ prefix`" and "`dir: Refuse to export .desktop files with suspicious uses of @@ tokens`" are recommended, but not strictly required. As a workaround, avoid installing Flatpak apps from untrusted sources, or check the contents of the exported `.desktop` files in `exports/share/applications/*.desktop` (typically `~/.local/share/flatpak/exports/share/applications/*.desktop` and `/var/lib/flatpak/exports/share/applications/*.desktop`) to make sure that literal filenames do not follow `@@` or `@@u`.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
来源: CVE Program / CVE List V5
Vulnerability Title
Flatpak 注入漏洞
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 存在安全漏洞,攻击者可利用该漏洞访问应用程序权限通常不允许的文件。
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

厂商 产品 影响版本 CPE 订阅
flatpak flatpak >= 0.9.4, < 1.10.2 -

二、漏洞 CVE-2021-21381 的公开POC

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三、漏洞 CVE-2021-21381 的情报信息

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CVE-2021-21381 补丁与修复 (4)

CVE-2021-21381 厂商安全公告 (3)

CVE-2021-21381 邮件列表归档 (2)

CVE-2021-21381 其他参考 (1)

IV. Related Vulnerabilities

V. Comments for CVE-2021-21381

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