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[ GLSA 200407-02 ] Linux Kernel: Multiple vulnerabilities
From: Tim Yamin <plasmaroo () gentoo org>
Date: Sat, 03 Jul 2004 23:53:18 +0100

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Gentoo Linux Security Advisory                           GLSA 200407-02
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Linux Kernel: Multiple vulnerabilities
      Date: July 03, 2004
      Bugs: #47881, #49637, #53804, #54976, #55698
        ID: 200407-02

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Synopsis
========

Multiple vulnerabilities have been found in the Linux kernel used by
GNU/Linux systems. Patched, or updated versions of these kernels have
been released and details are included in this advisory.

Background
==========

The Linux kernel is responsible for managing the core aspects of a
GNU/Linux system, providing an interface for core system applications
as well as providing the essential structure and capability to access
hardware that is needed for a running system.

Affected packages
=================

    -------------------------------------------------------------------
     Kernel               /      Unaffected      /             Remerge
    -------------------------------------------------------------------
  1  aa-sources ............... == 2.4.23-r2 ..................... YES
  2  alpha-sources ............ >= 2.4.21-r8 .........................
  3  ck-sources ............... == 2.4.26-r1 ..................... YES
     ........................... >= 2.6.7-r1 ..................... YES
  4  compaq-sources ......... >= 2.4.9.32.7-r7 .......................
  5  development-sources ........ >= 2.6.7 ...........................
  6  gaming-sources ........... >= 2.4.20-r14 ........................
  7  gentoo-dev-sources ......... >= 2.6.7 ...........................
  8  gentoo-sources .......... *>= 2.4.19-r17 ........................
     ......................... *>= 2.4.20-r20 ........................
     ......................... *>= 2.4.22-r12 ........................
     .......................... *>= 2.4.25-r5 ........................
     .......................... >= 2.4.26-r3 .........................
  9  grsec-sources .......... >= 2.4.26.2.0-r5 .......................
 10  gs-sources ............. >= 2.4.25_pre7-r7 ......................
 11  hardened-dev-sources ....... >= 2.6.7 ...........................
 12  hardened-sources ......... >= 2.4.26-r2 .........................
 13  hppa-dev-sources ........... >= 2.6.7 ...........................
 14  hppa-sources ............. >= 2.4.26_p6 .........................
 15  ia64-sources ............. >= 2.4.24-r5 .........................
 16  mips-sources ............. >= 2.4.26-r3 .........................
 17  mm-sources ................ >= 2.6.7-r1 .........................
 18  openmosix-sources ........ >= 2.4.22-r10 ........................
 19  pac-sources .............. >= 2.4.23-r8 .........................
 20  pegasos-dev-sources ........ >= 2.6.7 ...........................
 21  pegasos-sources .......... >= 2.4.26-r2 .........................
 22  planet-ccrma-sources ..... >= 2.4.21-r10 ........................
 23  ppc-sources .............. >= 2.4.26-r2 .........................
 24  ppc64-sources .............. >= 2.6.7 ...........................
 25  rsbac-sources ............ >= 2.4.26-r2 .........................
 26  rsbac-dev-sources ......... >= 2.6.7-r1 .........................
 27  selinux-sources .......... >= 2.4.26-r2 .........................
 28  sparc-sources ............ >= 2.4.26-r2 .........................
 29  uclinux-sources ......... >= 2.4.26_p0-r2 .......................
 30  usermode-sources ......... *>= 2.4.24-r5 ........................
     .......................... >= 2.4.26-r2 .........................
 31  vanilla-sources ........... Vulnerable! .........................
 32  vserver-sources ....... >= 2.4.26.1.3.9-r2 ......................
 33  win4lin-sources .......... >= 2.4.26-r2 .........................
 34  wolk-sources .............. *>= 4.9-r9 ..........................
     ........................... *>= 4.11-r6 .........................
     ........................... >= 4.14-r3 ..........................
 35  xbox-sources ............... >= 2.6.7 ...........................
 36  xfs-sources .............. >= 2.4.24-r8 .........................
    -------------------------------------------------------------------
     NOTE: Some kernels are still vulnerable. Users should migrate to
           another kernel if one is available or seek another
           solution such as patching their existing kernel.
    -------------------------------------------------------------------
     NOTE: Packages marked with "Remerge" as "YES" require a re-merge
           even though Portage does not indicate a newer version!
    -------------------------------------------------------------------
     36 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

Description
===========

Multiple flaws have been discovered in the Linux kernel. This advisory
corrects the following issues:

* CAN-2004-0109: This vulnerability allows privilege escalation using
  ISO9660 file systems through a buffer overflow via a malformed file
  system containing a long symbolic link entry. This can allow
  arbitrary code execution at kernel level.

* CAN-2004-0133: The XFS file system in 2.4 series kernels has an
  information leak by which data in the memory can be written to the
  device hosting the file system, allowing users to obtain portions of
  kernel memory by reading the raw block device.

* CAN-2004-0177: The ext3 file system in 2.4 series kernels does not
  properly initialize journal descriptor blocks, causing an information
  leak by which data in the memory can be written to the device hosting
  the file system, allowing users to obtain portions of kernel memory
  by reading the raw device.

* CAN-2004-0181: The JFS file system in 2.4 series kernels has an
  information leak by which data in the memory can be written to the
  device hosting the file system, allowing users to obtain portions of
  kernel memory by reading the raw device.

* CAN-2004-0178: The OSS Sound Blaster [R] Driver has a Denial of
  Service vulnerability since it does not handle certain sample sizes
  properly. This allows local users to hang the kernel.

* CAN-2004-0228: Due to an integer signedness error in the CPUFreq
  /proc handler code in 2.6 series Linux kernels, local users can
  escalate their privileges.

* CAN-2004-0229: The framebuffer driver in 2.6 series kernel drivers
  does not use the fb_copy_cmap method of copying structures. The
  impact of this issue is unknown, however.

* CAN-2004-0394: A buffer overflow in the panic() function of 2.4
  series Linux kernels exists, but it may not be exploitable under
  normal circumstances due to its functionality.

* CAN-2004-0427: The do_fork() function in both 2.4 and 2.6 series
  Linux kernels does not properly decrement the mm_count counter when
  an error occurs, triggering a memory leak that allows local users to
  cause a Denial of Service by exhausting other applications of memory;
  causing the kernel to panic or to kill services.

* CAN-2004-0495: Multiple vulnerabilities found by the Sparse source
  checker in the kernel allow local users to escalate their privileges
  or gain access to kernel memory.

* CAN-2004-0535: The e1000 NIC driver does not properly initialize
  memory structures before using them, allowing users to read kernel
  memory.

* CAN-2004-0554: 2.4 and 2.6 series kernels running on an x86 or an
  AMD64 architecture allow local users to cause a Denial of Service by
  a total system hang, due to an infinite loop that triggers a signal
  handler with a certain sequence of fsave and frstor instructions.

* Local DoS in PaX: If ASLR is enabled as a GRSecurity PaX feature, a
  Denial of Service can be achieved by putting the kernel into an
  infinite loop. Only 2.6 series GRSecurity kernels are affected by
  this issue.

* RSBAC 1.2.3 JAIL issues: A flaw in the RSBAC JAIL implementation
  allows suid/sgid files to be created inside the jail since the
  relevant module does not check the corresponding mode values. This
  can allow privilege escalation inside the jail. Only
  rsbac-(dev-)sources are affected by this issue.

Impact
======

Arbitrary code with normal non-super-user privileges may be able to
exploit any of these vulnerabilities; gaining kernel level access to
memory structures and hardware devices. This may be used for further
exploitation of the system, to leak sensitive data or to cause a Denial
of Service on the affected kernel.

Workaround
==========

Although users may not be affected by certain vulnerabilities, all
kernels are affected by the CAN-2004-0394, CAN-2004-0427 and
CAN-2004-0554 issues which have no workaround. As a result, all users
are urged to upgrade their kernels to patched versions.

Resolution
==========

Users are encouraged to upgrade to the latest available sources for
their system:

    # emerge sync
    # emerge -pv your-favorite-sources
    # emerge your-favorite-sources

    # # Follow usual procedure for compiling and installing a kernel.
    # # If you use genkernel, run genkernel as you would do normally.

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

    http://security.gentoo.org/glsa/glsa-200407-02.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0

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