CVE-2018-6552 Information

Description

Apport does not properly handle crashes originating from a PID namespace allowing local users to create certain files as root which an attacker could leverage to perform a denial of service via resource exhaustion possibly gain root privileges or escape from containers. The is_same_ns() function returns True when /proc/global pid/ does not exist in order to indicate that the crash should be handled in the global namespace rather than inside of a container. However the portion of the data/apport code that decides whether or not to forward a crash to a container does not always replace sys.argv[1] with the value stored in the host_pid variable when /proc/global pid/ does not exist which results in the container pid being used in the global namespace. This flaw affects versions 2.20.8-0ubuntu4 through 2.20.9-0ubuntu7 2.20.7-0ubuntu3.7 2.20.7-0ubuntu3.8 2.20.1-0ubuntu2.15 through 2.20.1-0ubuntu2.17 and 2.14.1-0ubuntu3.28.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://usn.ubuntu.com/3664-2/ https://usn.ubuntu.com/usn/usn-3664-1

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8