CVE-2017-12192

kernel: NULL pointer dereference due to KEYCTL_READ on negative key

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The keyctl_read_key function in security/keys/keyctl.c in the Key Management subcomponent in the Linux kernel before 4.13.5 does not properly consider that a key may be possessed but negatively instantiated, which allows local users to cause a denial of service (OOPS and system crash) via a crafted KEYCTL_READ operation.

La función keyctl_read_key en security/keys/keyctl.c en el subcomponente Key Management en el kernel de Linux en versiones anteriores a la 4.13.5 no considera correctamente que se puede tener una clave instanciada negativamente, lo que permite que los usuarios locales provoquen una denegación de servicio (OOPS y cierre inesperado del sistema) mediante una operación KEYCTL_READ manipulada.

A vulnerability was found in the Key Management sub component of the Linux kernel, where when trying to issue a KEYTCL_READ on a negative key would lead to a NULL pointer dereference. A local attacker could use this flaw to crash the kernel.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-08-01 CVE Reserved
2017-10-12 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (9)

URL	Tag	Source
https://lkml.org/lkml/2017/9/18/764	Mailing List

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=37863c43b2c6464f252862bf2e9768264e961678	2023-02-12
https://github.com/torvalds/linux/commit/37863c43b2c6464f252862bf2e9768264e961678	2023-02-12

URL	Date	SRC
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5	2023-02-12
https://access.redhat.com/errata/RHSA-2018:0151	2023-02-12
https://bugzilla.redhat.com/show_bug.cgi?id=1493435	2020-06-09
https://usn.ubuntu.com/3583-1	2023-02-12
https://usn.ubuntu.com/3583-2	2023-02-12
https://access.redhat.com/security/cve/CVE-2017-12192	2020-06-09

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"				<= 4.13.4 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.13.4"		-		Affected