CVE-2011-4080

kernel: sysctl: restrict write access to dmesg_restrict

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the CAP_SYS_ADMIN capability to modify the dmesg_restrict value, which allows local users to bypass intended access restrictions and read the kernel ring buffer by leveraging root privileges, as demonstrated by a root user in a Linux Containers (aka LXC) environment.

La función sysrq_sysctl_handler en kernel/sysctl.c en el kernel de Linux antes de v2.6.39 no requiere la capacidad de CAP_SYS_ADMIN para modificar el valor dmesg_restrict, lo que permite a usuarios locales eludir restricciones de acceso y leer el buffer de anillo del núcleo mediante el aprovechamiento de los privilegios de root, como se demuestra por un usuario root en un entorno Linux Containers (también conocido como LXC).

*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

High

Authentication

None

Confidentiality

Complete

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2011-10-18 CVE Reserved
2012-05-24 CVE Published
2023-03-08 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (6)

URL	Tag	Source
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39	Broken Link
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=bfdc0b497faa82a0ba2f9dddcf109231dd519fcc	X_refsource_confirm
http://www.openwall.com/lists/oss-security/2011/10/26/10	Mailing List

URL	Date	SRC

URL	Date	SRC
https://github.com/torvalds/linux/commit/bfdc0b497faa82a0ba2f9dddcf109231dd519fcc	2023-02-13

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2011-4080	2012-04-17
https://bugzilla.redhat.com/show_bug.cgi?id=749243	2012-04-17

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"				< 2.6.39 Search vendor "Linux" for product "Linux Kernel" and version " < 2.6.39"		-		Affected