Bug 190074

Summary:	CVE-2006-2071 mprotect gives write permission to a readonly attachment
Product:	Red Hat Enterprise Linux 3	Reporter:	Marcel Holtmann <holtmann>
Component:	kernel	Assignee:	Ernie Petrides <petrides>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	3.0	CC:	dhoward, lwang, petrides, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:	impact=moderate,public=20060417
Fixed In Version:	RHSA-2006-0710	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-10-19 12:41:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Marcel Holtmann 2006-04-27 11:23:13 UTC

All of 2.4 and 2.6 kernels have been letting mprotect give write permission to a
readonly attachment of shared memory, whether or not IPC would give the caller
that permission.

SUS says "The behaviour of this function [mprotect] is unspecified if the
mapping was not established by a call to mmap", but I don't think we can
interpret that as allowing it to subvert IPC permissions.

Comment 1 Marcel Holtmann 2006-04-27 11:29:28 UTC

The upstream fix can be found here:

http://www.kernel.org/git/?p=linux/kernel/git/marcelo/linux-2.4.git;a=commit;h=0dba0f6b382bf360a1974fd78538273478dfc784

Comment 2 Marcel Holtmann 2006-04-27 17:24:45 UTC

This is _not_ CVE-2006-1524. The commit message of the upstream fix is wrong.

Comment 3 Ernie Petrides 2006-07-31 21:48:08 UTC

Fix posted for internal review on 31-Jul-2006.

Comment 8 Ernie Petrides 2006-09-23 01:07:13 UTC

A fix for this problem has just been committed to the RHEL3 U9
patch pool this evening (in kernel version 2.4.21-47.1.EL).

Comment 9 Ernie Petrides 2006-10-13 21:49:07 UTC

A fix for this problem has also been committed to the RHEL3 E9
patch pool this evening (in kernel version 2.4.21-47.0.1.EL).

Comment 12 Red Hat Bugzilla 2006-10-19 12:41:31 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 the 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-2006-0710.html