SecurityTracker.com Archives - (Red Hat Issues Fix for RH Enterprise Linux) Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges

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Category: OS (Linux) > Linux Kernel

Vendors: kernel.org

(Red Hat Issues Fix for RH Enterprise Linux) Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges

SecurityTracker Alert ID: 1009121

CVE Reference: CAN-2004-0077 (Links to External Site)

Date: Feb 18 2004

Impact: Execution of arbitrary code via local system, Root access via local system

Fix Available: Yes Vendor Confirmed: Yes

Version(s): Red Hat Enterprise Linux 2.1

Description: Another vulnerability was reported in the Linux kernel do_mremap() function. A local user can execute arbitrary code with root privileges.

Paul Starzetz discovered and reported that there is a missing return value check within the mremap(2) system call.

When resizing or moving virtual memory areas, the function reportedly does not test the return value of the do_munmap() function. Cases where the function fails (for example, due to the number of virtual memory areas being exceeded by the calling process) will not be properly detected, according to the report. As a result, the kernel may move memory belonging to one process into memory space that is allocated to another process.

Some other calls to the do_munmap() function are also not checked, the report said.

A local user can gain root privileges on the target system.

The original advisory is available at:

http://isec.pl/vulnerabilities/isec-0014-mremap-unmap.txt

Impact: A local user can gain root privileges on the target system.

Vendor URL: www.kernel.org/ (Links to External Site)

Cause: Boundary error

Underlying OS: Linux (Red Hat Enterprise)

Reported By: bugzilla@redhat.com

Message History: This archive entry is a follow-up to the message listed below.

Feb 18 2004

Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges

Source Message Contents

Date: Wed, 18 Feb 2004 13:20 -0500
From: bugzilla@redhat.com
Subject: [RHSA-2004:069-01] Updated kernel packages fix security vulnerability

 

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated kernel packages fix security vulnerability
Advisory ID:       RHSA-2004:069-01
Issue date:        2004-02-18
Updated on:        2004-02-18
Product:           Red Hat Enterprise Linux
Keywords:          kernel update
Cross references:  
Obsoletes:         RHSA-2004:044
CVE Names:         CAN-2004-0010 CAN-2004-0077
- ---------------------------------------------------------------------

1. Topic:

Updated kernel packages that fix a security vulnerability which may allow
local users to gain root privileges are now available.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - athlon, i386, i686
Red Hat Enterprise Linux ES version 2.1 - athlon, i386, i686
Red Hat Enterprise Linux WS version 2.1 - athlon, i386, i686

3. Problem description:

The Linux kernel handles the basic functions of the operating
system.

Paul Starzetz discovered a flaw in return value checking in mremap() in the
Linux kernel versions 2.4.24 and previous that may allow a local attacker
to gain root privileges.  No exploit is currently available; however this
issue is exploitable. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2004-0077 to this issue.

Arjan van de Ven discovered a flaw in ncp_lookup() in ncpfs that could
allow local privilege escalation. ncpfs is only used to allow a system to
mount volumes of NetWare servers or print to NetWare printers. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0010 to this issue.

All users are advised to upgrade to these errata packages, which contain
backported security patches that correct these issues.   

Red Hat would like to thank Paul Starzetz from ISEC for reporting this
issue CAN-2004-0077.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL
Certificate Errors, you need to install a version of the
up2date client with an updated certificate.  The latest version of
up2date is available from the Red Hat FTP site and may also be
downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

115818 - CAN-2004-0077 Linux kernel do_mremap VMA limit local privilege escalation
115821 - CAN-2004-0010 ncpfs hole

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/kernel-2.4.9-e.38.src.rpm

athlon:
Available from Red Hat Network: kernel-2.4.9-e.38.athlon.rpm
Available from Red Hat Network: kernel-smp-2.4.9-e.38.athlon.rpm

i386:
Available from Red Hat Network: kernel-BOOT-2.4.9-e.38.i386.rpm
Available from Red Hat Network: kernel-doc-2.4.9-e.38.i386.rpm
Available from Red Hat Network: kernel-source-2.4.9-e.38.i386.rpm

i686:
Available from Red Hat Network: kernel-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-debug-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-enterprise-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-smp-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-summit-2.4.9-e.38.i686.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/kernel-2.4.9-e.38.src.rpm

athlon:
Available from Red Hat Network: kernel-2.4.9-e.38.athlon.rpm
Available from Red Hat Network: kernel-smp-2.4.9-e.38.athlon.rpm

i386:
Available from Red Hat Network: kernel-BOOT-2.4.9-e.38.i386.rpm
Available from Red Hat Network: kernel-doc-2.4.9-e.38.i386.rpm
Available from Red Hat Network: kernel-source-2.4.9-e.38.i386.rpm

i686:
Available from Red Hat Network: kernel-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-debug-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-smp-2.4.9-e.38.i686.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/kernel-2.4.9-e.38.src.rpm

athlon:
Available from Red Hat Network: kernel-2.4.9-e.38.athlon.rpm
Available from Red Hat Network: kernel-smp-2.4.9-e.38.athlon.rpm

i386:
Available from Red Hat Network: kernel-BOOT-2.4.9-e.38.i386.rpm
Available from Red Hat Network: kernel-doc-2.4.9-e.38.i386.rpm
Available from Red Hat Network: kernel-source-2.4.9-e.38.i386.rpm

i686:
Available from Red Hat Network: kernel-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-debug-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-enterprise-2.4.9-e.38.i686.rpm
Available from Red Hat Network: kernel-smp-2.4.9-e.38.i686.rpm



7. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------

bf08e551ec7d6d5494fc954ea4c25821 2.1AS/en/os/SRPMS/kernel-2.4.9-e.38.src.rpm
7d2613b6be59f6373caa28942fa0a701 2.1AS/en/os/athlon/kernel-2.4.9-e.38.athlon.rpm
f6a94c5daf096e28d889adb1c11e0f0b 2.1AS/en/os/athlon/kernel-smp-2.4.9-e.38.athlon.rpm
caaf7ebe7ffb964c45a54323b50808db 2.1AS/en/os/i386/kernel-BOOT-2.4.9-e.38.i386.rpm
706b15af88797d32cc92853fe69c30ef 2.1AS/en/os/i386/kernel-doc-2.4.9-e.38.i386.rpm
df50cc0f011f3cc0d4c96a8489ad9877 2.1AS/en/os/i386/kernel-source-2.4.9-e.38.i386.rpm
ddab05c5bdcfada0eeba724900a05cec 2.1AS/en/os/i686/kernel-2.4.9-e.38.i686.rpm
9f3a4bbc6bd6474472ce5675e755938c 2.1AS/en/os/i686/kernel-debug-2.4.9-e.38.i686.rpm
62eed58d9943efe07237d6fc2f860433 2.1AS/en/os/i686/kernel-enterprise-2.4.9-e.38.i686.rpm
71608b82e3eefc0f6c7d50185620031c 2.1AS/en/os/i686/kernel-smp-2.4.9-e.38.i686.rpm
5d27201d69a7b9cfd7b9cecb7f86a5e6 2.1AS/en/os/i686/kernel-summit-2.4.9-e.38.i686.rpm
bf08e551ec7d6d5494fc954ea4c25821 2.1ES/en/os/SRPMS/kernel-2.4.9-e.38.src.rpm
7d2613b6be59f6373caa28942fa0a701 2.1ES/en/os/athlon/kernel-2.4.9-e.38.athlon.rpm
f6a94c5daf096e28d889adb1c11e0f0b 2.1ES/en/os/athlon/kernel-smp-2.4.9-e.38.athlon.rpm
caaf7ebe7ffb964c45a54323b50808db 2.1ES/en/os/i386/kernel-BOOT-2.4.9-e.38.i386.rpm
706b15af88797d32cc92853fe69c30ef 2.1ES/en/os/i386/kernel-doc-2.4.9-e.38.i386.rpm
df50cc0f011f3cc0d4c96a8489ad9877 2.1ES/en/os/i386/kernel-source-2.4.9-e.38.i386.rpm
ddab05c5bdcfada0eeba724900a05cec 2.1ES/en/os/i686/kernel-2.4.9-e.38.i686.rpm
9f3a4bbc6bd6474472ce5675e755938c 2.1ES/en/os/i686/kernel-debug-2.4.9-e.38.i686.rpm
71608b82e3eefc0f6c7d50185620031c 2.1ES/en/os/i686/kernel-smp-2.4.9-e.38.i686.rpm
bf08e551ec7d6d5494fc954ea4c25821 2.1WS/en/os/SRPMS/kernel-2.4.9-e.38.src.rpm
7d2613b6be59f6373caa28942fa0a701 2.1WS/en/os/athlon/kernel-2.4.9-e.38.athlon.rpm
f6a94c5daf096e28d889adb1c11e0f0b 2.1WS/en/os/athlon/kernel-smp-2.4.9-e.38.athlon.rpm
caaf7ebe7ffb964c45a54323b50808db 2.1WS/en/os/i386/kernel-BOOT-2.4.9-e.38.i386.rpm
706b15af88797d32cc92853fe69c30ef 2.1WS/en/os/i386/kernel-doc-2.4.9-e.38.i386.rpm
df50cc0f011f3cc0d4c96a8489ad9877 2.1WS/en/os/i386/kernel-source-2.4.9-e.38.i386.rpm
ddab05c5bdcfada0eeba724900a05cec 2.1WS/en/os/i686/kernel-2.4.9-e.38.i686.rpm
9f3a4bbc6bd6474472ce5675e755938c 2.1WS/en/os/i686/kernel-debug-2.4.9-e.38.i686.rpm
62eed58d9943efe07237d6fc2f860433 2.1WS/en/os/i686/kernel-enterprise-2.4.9-e.38.i686.rpm
71608b82e3eefc0f6c7d50185620031c 2.1WS/en/os/i686/kernel-smp-2.4.9-e.38.i686.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/keys.html

You can verify each package with the following command:
    
    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum <filename>


8. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0010
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0077

9. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
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