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FreeBSD: VID-5721AE65-B30A-11E9-A87F-A4BADB2F4699 (CVE-2019-5606): FreeBSD -- pts(4) write-after-free

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FreeBSD: VID-5721AE65-B30A-11E9-A87F-A4BADB2F4699 (CVE-2019-5606): FreeBSD -- pts(4) write-after-free

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
07/24/2019
Created
07/31/2019
Added
07/31/2019
Modified
08/16/2019

Description

In FreeBSD 12.0-STABLE before r349805, 12.0-RELEASE before 12.0-RELEASE-p8, 11.3-STABLE before r349806, 11.3-RELEASE before 11.3-RELEASE-p1, and 11.2-RELEASE before 11.2-RELEASE-p12, code which handles close of a descriptor created by posix_openpt fails to undo a signal configuration. This causes an incorrect signal to be raised leading to a write after free of kernel memory allowing a malicious user to gain root privileges or escape a jail.

Solution(s)

  • freebsd-upgrade-base-11_2-release-p12
  • freebsd-upgrade-base-11_3-release-p1
  • freebsd-upgrade-base-12_0-release-p8

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