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Category:  OS (Linux)  >  Linux Kernel Vendors:  Mandrake
(Mandrake Issues Fix) Linux Kernel 2.4 O_DIRECT Processing Flaw May Disclose File System Information to Local Users
SecurityTracker Alert ID:  1006051
CVE Reference:  CAN-2003-0018   (Links to External Site)
Date:  Feb 6 2003
Impact:  Denial of service via local system, Disclosure of system information, Disclosure of user information
Fix Available:  Yes   Vendor Confirmed:  Yes  
Version(s): Kernel 2.4.10 and later
Description:  A vulnerability was reported in the Linux 2.4 kernel. A local user may be able to read some information from the file system that the user is not authorized to read.

It is reported that there is a vulnerability in the O_DIRECT handling in Linux kernels 2.4.10 and later. An information leak may allow a local user with write privileges to the file system to read information from the file system from previously deleted files. The local user may also be able to corrupt the file system in a minor fashion that can reportedly be easily repaired by fsck.

Impact:  A local user may be able to read portions of previously deleted files (belonging to other users) and may be able to cause minor file system corruption.
Solution:  Mandrake has released a fix for Mandrake Linux 9.0:

ed3a07724f3b510d3d57fe35fc601e78 9.0/RPMS/kernel-2.4.19.24mdk-1-1mdk.i586.rpm
8b5b1721639ff0f137650fed781b2061 9.0/RPMS/kernel-BOOT-2.4.19.24mdk-1-1mdk.i586.rpm
db575a265fb967568af320072132ac50 9.0/RPMS/kernel-doc-2.4.19-24mdk.i586.rpm
998177a07d674e2ca94c9cdcf3ee2ef4 9.0/RPMS/kernel-enterprise-2.4.19.24mdk-1-1mdk.i586.rpm
da5d2a2cbada7b6db04468eadcf94979 9.0/RPMS/kernel-secure-2.4.19.24mdk-1-1mdk.i 586.rpm
33543e3392b9afda0f663d880a733614 9.0/RPMS/kernel-smp-2.4.19.24mdk-1-1mdk.i586.rpm
cba769d4bdec28c862b1c84498106f2d 9.0/RPMS/kernel-source-2.4.19-24mdk.i586.rpm
8b446dc9c29a72a34fa3e63d2ca3ae8c 9.0/SRPMS/kernel-2.4.19.24mdk-1-1mdk.src.rpm

Vendor URL:  www.mandrakesecure.net/en/advisories/ (Links to External Site)
Cause:  Access control error
Underlying OS:  Linux (Mandrake)
Underlying OS Comments:  9.0
Underlying OS:  Linux (Mandrake)
Reported By:  Mandrake Linux Security Team <security@linux-mandrake.com>
Message History:   This archive entry is a follow-up to the message listed below.
Feb 6 2003 Linux Kernel 2.4 O_DIRECT Processing Flaw May Disclose File System Information to Local Users



 Source Message Contents

Date:  5 Feb 2003 18:03:29 -0000
From:  Mandrake Linux Security Team <security@linux-mandrake.com>
Subject:  [Security Announce] MDKSA-2003:014 - Updated kernel packages fix

 

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

________________________________________________________________________

                Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name:           kernel
Advisory ID:            MDKSA-2003:014
Date:                   February 5th, 2003

Affected versions:      9.0
________________________________________________________________________

Problem Description:

 An updated kernel for 9.0 is available with a number of bug fixes. 
 Supermount has been completely overhauled and should be solid on all
 systems.  Other fixes include XFS with high memory, a netfilter fix,
 a fix for Sony VAIO DMI, i845 should now work with UDMA, and new 
 support for VIA C3 is included.  Prism24 has been updated so it now 
 works properly on HP laptops and a new ACPI is included, although it is 
 disabled by default for broader compatibility.
 
 This also fixes a security problem that allows non-root users to freeze
 the kernel, and a fix for a vulnerability in O_DIRECT handling that can 
 create a limited information leak where any user on the system with 
 write privilege to the file system from previously deleted files.  This 
 also allows users to create minor file system corruption (this can
 easily be repaired by fsck).
________________________________________________________________________

References:
  
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0018
________________________________________________________________________

Updated Packages:
  
 Mandrake Linux 9.0:
 ed3a07724f3b510d3d57fe35fc601e78  9.0/RPMS/kernel-2.4.19.24mdk-1-1mdk.i586.rpm
 8b5b1721639ff0f137650fed781b2061  9.0/RPMS/kernel-BOOT-2.4.19.24mdk-1-1mdk.i586.rpm
 db575a265fb967568af320072132ac50  9.0/RPMS/kernel-doc-2.4.19-24mdk.i586.rpm
 998177a07d674e2ca94c9cdcf3ee2ef4  9.0/RPMS/kernel-enterprise-2.4.19.24mdk-1-1mdk.i586.rpm
 da5d2a2cbada7b6db04468eadcf94979  9.0/RPMS/kernel-secure-2.4.19.24mdk-1-1mdk.i586.rpm
 33543e3392b9afda0f663d880a733614  9.0/RPMS/kernel-smp-2.4.19.24mdk-1-1mdk.i586.rpm
 cba769d4bdec28c862b1c84498106f2d  9.0/RPMS/kernel-source-2.4.19-24mdk.i586.rpm
 8b446dc9c29a72a34fa3e63d2ca3ae8c  9.0/SRPMS/kernel-2.4.19.24mdk-1-1mdk.src.rpm
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):
________________________________________________________________________

To upgrade automatically, use MandrakeUpdate.  The verification of md5
checksums and GPG signatures is performed automatically for you.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm".  A list of
FTP mirrors can be obtained from:

  http://www.mandrakesecure.net/en/ftp.php

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package.  You can do this with the command:

  rpm --checksig <filename>

All packages are signed by MandrakeSoft for security.  You can obtain
the GPG public key of the Mandrake Linux Security Team from:

  https://www.mandrakesecure.net/RPM-GPG-KEYS

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

  http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to.  Information on these lists can be obtained by
visiting:

  http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

  security_linux-mandrake.com

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team
  <security linux-mandrake.com>

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