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FreeBSD: VID-A7B97D26-9792-11EB-B87A-901B0EF719AB (CVE-2020-25584): FreeBSD -- jail escape possible by mounting over jail root

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FreeBSD: VID-A7B97D26-9792-11EB-B87A-901B0EF719AB (CVE-2020-25584): FreeBSD -- jail escape possible by mounting over jail root

Severity
6
CVSS
(AV:L/AC:H/Au:N/C:C/I:C/A:C)
Published
04/06/2021
Created
11/08/2022
Added
11/04/2022
Modified
11/04/2022

Description

In FreeBSD 13.0-STABLE before n245118, 12.2-STABLE before r369552, 11.4-STABLE before r369560, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, a superuser inside a FreeBSD jail configured with the non-default allow.mount permission could cause a race condition between the lookup of ".." and remounting a filesystem, allowing access to filesystem hierarchy outside of the jail.

Solution(s)

  • freebsd-upgrade-base-11_4-release-p9
  • freebsd-upgrade-base-12_2-release-p6

References

  • CVE-2020-25584

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