CVE-2017-17448

kernel: Missing capabilities check in net/netfilter/nfnetlink_cthelper.c allows for unprivileged access to systemwide nfnl_cthelper_list structure

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations, which allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.

net/netfilter/nfnetlink_cthelper.c en el kernel de Linux hasta la versión 4.14.4 no requiere la capacidad CAP_NET_ADMIN para operaciones "new", "get" y "del", lo que permite que usuarios locales omitan las restricciones de acceso establecidas debido a que la estructura de datos nfnl_cthelper_list se comparte entre todos los espacios de nombres de la red.

The net/netfilter/nfnetlink_cthelper.c function in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations. This allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-04-03 CVE Published
2017-12-06 CVE Reserved
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-284: Improper Access Control
CWE-862: Missing Authorization

CAPEC

References (17)

URL	Tag	Source
http://www.securityfocus.com/bid/102117	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://patchwork.kernel.org/patch/10089373	2019-10-03

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2018:0654	2019-10-03
https://access.redhat.com/errata/RHSA-2018:0676	2019-10-03
https://access.redhat.com/errata/RHSA-2018:1062	2019-10-03
https://usn.ubuntu.com/3617-1	2019-10-03
https://usn.ubuntu.com/3617-2	2019-10-03
https://usn.ubuntu.com/3617-3	2019-10-03
https://usn.ubuntu.com/3619-1	2019-10-03
https://usn.ubuntu.com/3619-2	2019-10-03
https://usn.ubuntu.com/3620-1	2019-10-03
https://usn.ubuntu.com/3620-2	2019-10-03
https://usn.ubuntu.com/3632-1	2019-10-03
https://www.debian.org/security/2017/dsa-4073	2019-10-03
https://www.debian.org/security/2018/dsa-4082	2019-10-03
https://access.redhat.com/security/cve/CVE-2017-17448	2018-04-10
https://bugzilla.redhat.com/show_bug.cgi?id=1525768	2018-04-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 4.14.4 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.14.4"		-		Affected