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CVE-2019-16884

Published: 25 September 2019

runc through 1.0.0-rc8, as used in Docker through 19.03.2-ce and other products, allows AppArmor restriction bypass because libcontainer/rootfs_linux.go incorrectly checks mount targets, and thus a malicious Docker image can mount over a /proc directory.

From the Ubuntu Security Team

It was discovered that runC incorrectly implemented AppArmor restrictions. An attacker could possibly use this issue to mount malicious images.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
runc
Launchpad, Ubuntu, Debian
bionic
Released (1.0.0~rc10-0ubuntu1~18.04.2)
disco Ignored
(end of life)
eoan
Released (1.0.0~rc8+git20190923.3e425f80-0ubuntu1)
focal
Released (1.0.0~rc8+git20190923.3e425f80-0ubuntu1)
groovy
Released (1.0.0~rc8+git20190923.3e425f80-0ubuntu1)
hirsute
Released (1.0.0~rc8+git20190923.3e425f80-0ubuntu1)
impish
Released (1.0.0~rc8+git20190923.3e425f80-0ubuntu1)
jammy
Released (1.0.0~rc8+git20190923.3e425f80-0ubuntu1)
trusty Does not exist

upstream
Released (1.0.0~rc9)
xenial
Released (1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm2)
Available with Ubuntu Pro
Patches:
upstream: https://github.com/opencontainers/runc/commit/331692baa7afdf6c186f8667cb0e6362ea0802b3

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N