CVE-2021-21261

一、漏洞信息
 漏洞编号：[CVE-2021-21261](https://nvd.nist.gov/vuln/detail/CVE-2021-21261)
 漏洞归属组件：[flatpak](https://gitee.com/src-openeuler/flatpak)
 漏洞归属的版本：1.0.3
 CVSS V3.0分值：
  BaseScore：8.8 High
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
 漏洞简述：
  Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. In vulnerable versions, the Flatpak portal service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the `flatpak run` command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by the `flatpak run` command, and use them to execute arbitrary code that is not in a sandbox. As a workaround, this vulnerability can be mitigated by preventing the `flatpak-portal` service from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.10.0.
 漏洞公开时间：2021-01-15 04:15
 漏洞创建时间：2021-01-27 06:00:18
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-21261
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| MISC | https://github.com/flatpak/flatpak/releases/tag/1.8.5 |  |
| CONFIRM | https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2 |  |
| DEBIAN | https://www.debian.org/security/2021/dsa-4830 |  |
| MISC | https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba |  |
| MISC | https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486 |  |
| MISC | https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4 |  |
| MISC | https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b |  |
| GENTOO | https://security.gentoo.org/glsa/202101-21 |  |
| redhat | https://access.redhat.com/security/cve/CVE-2021-21261 |  |
| github | https://github.com/flatpak/flatpak/commit/57416f380600d9754df12baf5b227144ff1bb54d |  |
| github |  https://github.com/flatpak/flatpak/commit/6a11007021658518c088ba0cc5e4da27962a940a |  |
| github |  https://github.com/flatpak/flatpak/commit/dcd24941c7087c5f7e8033abe50b178ac02a34af |  |
| github |  https://github.com/flatpak/flatpak/commit/fb1eaefbceeb73f02eb1bc85865d74a414faf8b8 |  |
| github |  https://github.com/flatpak/flatpak/releases/tag/1.8.5 |  |
| github |  https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2 |  |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  openBrain开源漏洞感知系统
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

无
</details>

二、漏洞分析结构反馈
 影响性分析说明：
    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 存在注入漏洞，该漏洞源于flatpak-portal允许沙箱应用程序在主机系统上执行任意代码(沙箱逃脱)。 
 openEuler评分：
  8.8
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
 受影响版本排查(受影响/不受影响)：
  1.mainline:受影响
2.openEuler-20.03-LTS(1.0.3):受影响
3.openEuler-20.03-LTS-Next(1.0.3):受影响
4.openEuler-20.03-LTS-SP1(1.0.3):受影响
5.openEuler-20.09(1.0.3):受影响
6.openEuler-21.03(1.0.3):受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP1(1.0.3):
2.openEuler-20.03-LTS-SP3(1.0.3):
3.openEuler-22.03-LTS(1.10.2):
4.openEuler-22.03-LTS-SP1(1.10.2):

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2021-1043

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