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CVE-2020-1733

Published: 11 March 2020

A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p <dir>"; this operation does not fail if the directory already exists and is owned by another user. An attacker could take advantage to gain control of the become user as the target directory can be retrieved by iterating '/proc/<pid>/cmdline'.

Priority

Medium

Cvss 3 Severity Score

5.0

Score breakdown

Status

Package Release Status
ansible
Launchpad, Ubuntu, Debian
bionic
Released (2.5.1+dfsg-1ubuntu0.1+esm1)
Available with Ubuntu Pro
eoan Ignored
(end of life)
focal
Released (2.9.6+dfsg-1ubuntu0.1~esm1)
Available with Ubuntu Pro
groovy Not vulnerable
(2.9.7+dfsg-1)
hirsute Not vulnerable
(2.9.7+dfsg-1)
impish Not vulnerable
(2.9.7+dfsg-1)
jammy Not vulnerable
(2.9.7+dfsg-1)
kinetic Not vulnerable
(2.9.7+dfsg-1)
lunar Not vulnerable
(2.9.7+dfsg-1)
mantic Not vulnerable
(2.9.7+dfsg-1)
trusty Needed

upstream
Released (2.9.7+dfsg-1, 1.7.2+dfsg-2+deb9u3)
xenial
Released (2.0.0.2-2ubuntu1.3+esm1)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 5.0
Attack vector Local
Attack complexity High
Privileges required Low
User interaction Required
Scope Changed
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L