CVE-2018-18397

CVSS V2 Low 2.1 CVSS V3 Medium 5.5

Description

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

Overview

CVE ID
CVE-2018-18397

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2018-12-12T10:29:00

Last Modified Date
2020-08-24T17:37:01

Weakness Enumerations

CWE	URL
CWE-863	http://cwe.mitre.org/data/definitions/863.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
cpe:2.3:o:linux:linux_kernel::::::::	1	OR	4.19.7
cpe:2.3:a:redhat:openshift_container_platform:3.11:::::::*	1	OR
cpe:2.3:a:redhat:virtualization_host:4.0:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server:7.0:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:::::::*	1	OR
cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::	1	OR
cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::	1	OR
cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::	1	OR
cpe:2.3:o:canonical:ubuntu_linux:18.10:::::::*	1	OR

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:L/Au:N/C:N/I:P/A:N

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
NONE

Integrity Impact
PARTIAL

Availability Impact
NONE

Base Score
2.1

Severity
LOW

Exploitability Score
3.9

Impact Score
2.9

CVSS Version 3

Version
3.0

Vector String
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
NONE

Availability Impact
NONE

Base Score
5.5

Base Severity
MEDIUM

Exploitability Score
1.8

Impact Score
3.6

References

Reference URL	Reference Tags
https://github.com/torvalds/linux/commit/29ec90660d68bbdd69507c1c8b4e33aa299278b1	Patch Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.7	Patch Vendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.87	Patch Vendor Advisory
https://bugs.chromium.org/p/project-zero/issues/detail?id=1700	Exploit Issue Tracking Third Party Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=29ec90660d68bbdd69507c1c8b4e33aa299278b1	Patch Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0202	Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0163	Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0324	Third Party Advisory
https://usn.ubuntu.com/3901-2/	Third Party Advisory
https://usn.ubuntu.com/3901-1/	Third Party Advisory
https://usn.ubuntu.com/3903-2/	Third Party Advisory
https://usn.ubuntu.com/3903-1/	Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0831	Third Party Advisory
https://access.redhat.com/errata/RHBA-2019:0327	Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2018-18397
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18397

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 16:30:35				Added to TrackCVE
2022-12-03 15:17:17	2018-12-12T10:29Z	2018-12-12T10:29:00	CVE Published Date	updated
2022-12-03 15:17:17		2020-08-24T17:37:01	CVE Modified Date	updated
2022-12-03 15:17:17		Analyzed	Vulnerability Status	updated