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]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.1
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Frantisek Hrbata
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On: 653245
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-03-10 12:44 UTC by RHEL Product and Program Management
Modified: 2011-04-12 12:47 UTC (History)
9 users (show)

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.
Clone Of:
Environment:
Last Closed: 2011-04-08 02:59:32 UTC
Target Upstream Version:

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Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:0421 normal SHIPPED_LIVE Important: kernel security and bug fix update 2011-04-08 02:56:45 UTC

Description RHEL Product and Program Management 2011-03-10 12:44:33 UTC 
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 2011-04-08 02:59:32 UTC 
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 12:47:15 UTC 
    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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