CVE-2018-13405

CVE Details

Release Date:	2018-07-06
Impact:	Important	What is this?

Description

The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.

See more information about CVE-2018-13405 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (dtrace-modules-3.8.13-118.24.1.el6uek)	ELSA-2018-4211	2018-09-10
Oracle Linux version 6 (kernel)	ELSA-2019-0717	2019-04-11
Oracle Linux version 6 (kernel-uek)	ELSA-2018-4211	2018-09-10
Oracle Linux version 7 (dtrace-modules-3.8.13-118.24.1.el7uek)	ELSA-2018-4211	2018-09-10
Oracle Linux version 7 (kernel)	ELSA-2018-3083	2018-11-05
Oracle Linux version 7 (kernel-uek)	ELSA-2018-4211	2018-09-10