CVE-2015-8539

kernel: local privesc in key management

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The KEYS subsystem in the Linux kernel before 4.4 allows local users to gain privileges or cause a denial of service (BUG) via crafted keyctl commands that negatively instantiate a key, related to security/keys/encrypted-keys/encrypted.c, security/keys/trusted.c, and security/keys/user_defined.c.

El subsistema KEYS en el kernel de Linux en versiones anteriores a 4.4 permite a usuarios locales obtener privilegios o provocar una denegación de servicio (BUG) a través de comandos keyctl manipulados que instancia una clave negativamente, relacionado con security/keys/encrypted-keys/encrypted.c, security/keys/trusted.c y security/keys/user_defined.c.

A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there.

*Credits: N/A

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

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-12-10 CVE Reserved
2016-02-08 CVE Published
2023-03-08 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-269: Improper Privilege Management
CWE-667: Improper Locking

CAPEC

References (25)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2015/12/09/1	2022-01-31
https://github.com/torvalds/linux/commit/096fe9eaea40a17e125569f9e657e34cdb6d73bd	2022-01-31

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00007.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00008.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00009.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00011.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00017.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00018.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00019.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00020.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00021.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00022.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00034.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html	2022-01-31
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html	2022-01-31
https://access.redhat.com/errata/RHSA-2018:0151	2022-01-31
https://access.redhat.com/errata/RHSA-2018:0152	2022-01-31
https://access.redhat.com/errata/RHSA-2018:0181	2022-01-31
https://bugzilla.redhat.com/show_bug.cgi?id=1284450	2018-01-25
https://usn.ubuntu.com/3798-1	2022-01-31
https://usn.ubuntu.com/3798-2	2022-01-31
https://access.redhat.com/security/cve/CVE-2015-8539	2018-01-25

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		esm		Affected
Suse Search vendor "Suse"		Linux Enterprise Real Time Extension Search vendor "Suse" for product "Linux Enterprise Real Time Extension"				12 Search vendor "Suse" for product "Linux Enterprise Real Time Extension" and version "12"		sp1		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.4 Search vendor "Linux" for product "Linux Kernel" and version " < 4.4"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				4.4 Search vendor "Linux" for product "Linux Kernel" and version "4.4"		rc1		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				4.4 Search vendor "Linux" for product "Linux Kernel" and version "4.4"		rc2		Affected