Bug 683822 – kernel: restrict unprivileged access to kernel syslog [rhel-6.1] [rhel-6.0.z]

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Bug 683822 - kernel: restrict unprivileged access to kernel syslog [rhel-6.1] [rhel-6.0.z]

Summary:	kernel: restrict unprivileged access to kernel syslog [rhel-6.1] [rhel-6.0.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.1
Hardware:	Unspecified Unspecified

Priority	high Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Frantisek Hrbata
QA Contact:	Red Hat Kernel QE team
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	653245
Blocks:
	Show dependency tree / graph

Reported:	2011-03-10 07:44 EST by RHEL Product and Program Management
Modified:	2011-04-12 08:47 EDT (History)
CC List:	9 users (show)

See Also:
Fixed In Version:	kernel-2.6.32-71.20.1.el6
Doc Type:	Bug Fix
Doc Text:	The kernel syslog contains debugging information that is often useful during exploitation of other vulnerabilities such as kernel heap addresses. With this update, a new CONFIG_SECURITY_DMESG_RESTRICT option has been added to config-generic-rhel which prevents unprivileged users from reading the kernel syslog. This option is by default turned off (0), which means no restrictions.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-04-07 22:59:32 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0421	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2011-04-07 22:56:45 EDT

Groups: None (edit)

Description RHEL Product and Program Management 2011-03-10 07:44:33 EST

This bug has been copied from bug #653245 and has been proposed
to be backported to 6.0 z-stream (EUS).

Comment 6 errata-xmlrpc 2011-04-07 22:59:32 EDT

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0421.html

Comment 7 Martin Prpič 2011-04-12 08:47:15 EDT

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
The kernel syslog contains debugging information that is often useful during exploitation of other vulnerabilities such as kernel heap addresses. With this update, a new CONFIG_SECURITY_DMESG_RESTRICT option has been added to config-generic-rhel which prevents unprivileged users from reading the kernel syslog. This option is by default turned off (0), which means no restrictions.

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