CVE-2017-18344

CVSS V2 Low 2.1 CVSS V3 Medium 5.5

Description

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

Overview

CVE ID
CVE-2017-18344

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2018-07-26T19:29:00

Last Modified Date
2020-10-15T13:28:10

Weakness Enumerations

CWE	URL
CWE-125	http://cwe.mitre.org/data/definitions/125.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
cpe:2.3:o:linux:linux_kernel::::::::	1	OR	4.14.8
cpe:2.3:o:canonical:ubuntu_linux:12.04::::esm:::	1	OR
cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::	1	OR
cpe:2.3:a:redhat:mrg_realtime:2.0:::::::*	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:7.2:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:::::::*	1	OR

CVSS Version 2

Version
2.0

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

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
PARTIAL

Integrity Impact
NONE

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:H/I:N/A:N

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

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/cef31d9af908243421258f1df35a4a644604efbe	Patch Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8	Third Party Advisory
http://www.securityfocus.com/bid/104909	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1041414	Third Party Advisory VDB Entry
https://www.exploit-db.com/exploits/45175/	Exploit Third Party Advisory VDB Entry
https://usn.ubuntu.com/3742-2/	Third Party Advisory
https://usn.ubuntu.com/3742-1/	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3096	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3083	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2948	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3459	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3591	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3590	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3586	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3540	Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2017-18344
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18344

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 17:08:35				Added to TrackCVE
2022-12-03 10:33:13	2018-07-26T19:29Z	2018-07-26T19:29:00	CVE Published Date	updated
2022-12-03 10:33:13		2020-10-15T13:28:10	CVE Modified Date	updated
2022-12-03 10:33:13		Analyzed	Vulnerability Status	updated