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CVE-2018-6552

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-3664-2
Posted Jun 5, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3664-2 - USN-3664-1 fixed a vulnerability in Apport. Sander Bos reported that Ubuntu 14.04 LTS was also vulnerable to this issue, but was incorrectly omitted from the previous updates. This update provides the corresponding update for Ubuntu 14.04 LTS. Sander Bos discovered that Apport incorrectly handled core dumps when certain files are missing from /proc. A local attacker could possibly use this issue to cause a denial of service, gain root privileges, or escape from containers. Various other issues were also addressed.

tags | advisory, denial of service, local, root
systems | linux, ubuntu
advisories | CVE-2018-6552
SHA-256 | 82738ed5a01bd47de75aafd897c85fc8bcf1629b34e058f286faf7fd5e618bc9
Ubuntu Security Notice USN-3664-1
Posted May 31, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3664-1 - Sander Bos discovered that Apport incorrectly handled core dumps when certain files are missing from /proc. A local attacker could possibly use this issue to cause a denial of service, gain root privileges, or escape from containers.

tags | advisory, denial of service, local, root
systems | linux, ubuntu
advisories | CVE-2018-6552
SHA-256 | f8bd164a4dab67d5f1cb9bbeba62f5dd5317d2b3aefa38f3af5fed9d94f78351
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