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CVE-2018-6552

Apport treats the container PID as the global PID when /proc/<global_pid>/ is missing

High7.8EPSS 0.39%
Published
Updated
Reserved
Assigned by
canonical

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.

Scores

CVSS scores of CVE-2018-6552, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0High7.8CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.39% · top 67% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

  • Denial of service via resource exhaustion, privilege escalation, and escape from containers

Affected products

  • Apport

    • affected 2.20.8-0ubuntu4 – < unspecified
    • affected unspecified – < 2.20.9-0ubuntu7.1

  • Apport

    • affected 2.20.1-0ubuntu2.15 – < unspecified
    • affected unspecified – < 2.20.1-0ubuntu2.18

  • Apport

    • affected 2.20.7-0ubuntu3.7 – < unspecified
    • affected unspecified – < 2.20.7-0ubuntu3.9

  • Apport

    • affected 2.14.1-0ubuntu3.28

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .