CVE-2020-1733 Information

Description

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’.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1733 https://github.com/ansible/ansible/issues/67791 https://lists.debian.org/debian-lts-announce/2020/05/msg00005.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DKPA4KC3OJSUFASUYMG66HKJE7ADNGFW/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MRRYUU5ZBLPBXCYG6CFP35D64NP2UB2S/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQVOQD4VAIXXTVQAJKTN7NUGTJFE2PCB/ https://security.gentoo.org/glsa/202006-11

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

LOW

Base Severity

5.0