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Slackware: Kernal buffer overflow leading to root Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
Slackware New kernels are available for Slackware 9.1 and -current. Thesehave been upgraded to Linux kernel version 2.4.23, which fixes abug in the kernel's do_brk() function that could be exploited togain root privileges.

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

[slackware-security]  Kernel security update  (SSA:2003-336-01)

New kernels are available for Slackware 9.1 and -current.  These
have been upgraded to Linux kernel version 2.4.23, which fixes a
bug in the kernel's do_brk() function that could be exploited to
gain root privileges.  These updated kernels and modules should be
installed by any sites running a 2.4 kernel earlier than 2.4.23.
Linux 2.0 and 2.2 kernels are not vulnerable.

More details about the kernel issue may be found in the Common
Vulnerabilities and Exposures (CVE) database:

   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0961


Here are the details from the Slackware 9.1 ChangeLog:
+--------------------------+
Mon Dec  1 21:36:30 PST 2003
patches/kernels/:  Upgraded to Linux 2.4.23.  This fixes a bug in the
  kernel's do_brk() function which a local user could exploit to gain
  root privileges.  For more details, see:
     http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0961
  Sites should upgrade to the 2.4.23 kernel and kernel modules.  After
  installing the new kernel, be sure to run 'lilo'.
  (* Security fix *)
patches/packages/alsa-driver-0.9.8-i486-1.tgz:  Upgraded to
  alsa-driver-0.9.8, compiled against linux-2.4.23.
patches/packages/alsa-lib-0.9.8-i486-1.tgz:  Upgraded to alsa-lib-0.9.8.
patches/packages/alsa-oss-0.9.8-i486-1.tgz:  Upgraded to alsa-oss-0.9.8.
patches/packages/alsa-utils-0.9.8-i486-1.tgz:  Upgraded to
  alsa-utils-0.9.8.
patches/packages/kernel-ide-2.4.23-i486-1.tgz:  Upgraded bare.i kernel
  package to Linux 2.4.23.
patches/packages/kernel-modules-2.4.23-i486-1.tgz:  Upgraded to Linux
  2.4.23 kernel modules.
patches/packages/kernel-source-2.4.23-noarch-2.tgz:  Upgraded to Linux
  2.4.23 kernel source, with XFS and Speakup patches included (but not
  pre-applied).
patches/packages/kernel-modules-xfs/alsa-driver-xfs-0.9.8-i486-1.tgz:
  Upgraded to alsa-driver-0.9.8, compiled against linux-2.4.23-xfs.
patches/packages/kernel-modules-xfs/kernel-modules-xfs-2.4.23-i486-1.tgz:
  Upgraded to Linux 2.4.23 kernel modules for the xfs.s (XFS patched)
  kernel.
+--------------------------+


WHERE TO FIND THE NEW PACKAGES:
+-----------------------------+

Updated packages for Slackware 9.1: 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/kernel-ide-2.4.23-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/kernel-modules-2.4.23-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/kernel-source-2.4.23-noarch-2.tgz

An alternate kernel may be installed.  Those are found in this directory: 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/kernels/

ALSA has also been updated to 0.9.8 and compiled for 2.4.23.  These
packages will also be required to use the ALSA sound system:
 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/alsa-driver-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/alsa-lib-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/alsa-oss-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/alsa-utils-0.9.8-i486-1.tgz

The XFS patched kernel requires different kernel modules.  If you use
the XFS filesystem and XFS patched kernel (xfs.s), these packages
contain kernel modules compiled against 2.4.23-xfs: 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/kernel-modules-xfs/alsa-driver-xfs-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/kernel-modules-xfs/kernel-modules-xfs-2.4.23-i486-1.tgz


Updated packages for Slackware -current: 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/a/kernel-ide-2.4.23-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/a/kernel-modules-2.4.23-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/d/kernel-headers-2.4.23-i386-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/k/kernel-source-2.4.23-noarch-2.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/ap/alsa-utils-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/alsa-driver-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/alsa-lib-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/alsa-oss-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/extra/kernel-modules-xfs/alsa-driver-xfs-0.9.8-i486-1.tgz 
ftp://ftp.slackware.com/pub/slackware/slackware-current/extra/kernel-modules-xfs/kernel-modules-xfs-2.4.23-i486-1.tgz


MD5 SIGNATURES:
+-------------+

MD5 signatures may be downloaded from our FTP server:

Slackware 9.1 packages: 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/CHECKSUMS.md5

To verify authenticity, this file has been signed with the Slackware
GPG key (use 'gpg --verify'):
 
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/CHECKSUMS.md5.asc


Slackware -current packages: 
ftp://ftp.slackware.com/pub/slackware/slackware-current/CHECKSUMS.md5 
ftp://ftp.slackware.com/pub/slackware/slackware-current/CHECKSUMS.md5.asc


INSTALLATION INSTRUCTIONS:
+------------------------+

Use upgradepkg to install the new kernel, kernel-modules, and alsa packages.
After installing the kernel-ide package you will need to run lilo ('lilo' at
a command prompt) or create a new system boot disk ('makebootdisk'), and
reboot.

If desired, a kernel from the kernels/ directory may be used instead.  For
example, to use the kernel in kernels/scsi.s/, you would copy it to the
boot directory like this:

cd kernels/scsi.s
cp bzImage /boot/vmlinuz-scsi.s-2.4.23

Create a symbolic link:
ln -sf /boot/vmlinuz-scsi.s-2.4.23 /boot/vmlinuz

Then, run 'lilo' or create a new system boot disk and reboot.


+-----+

Slackware Linux Security Team 
http://slackware.com/gpg-key
security@slackware.com

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-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (GNU/Linux)

iD8DBQE/zNRFakRjwEAQIjMRAmieAJ46ssILaq+a++J0uPHPKsQPzgNtagCdHAJI
ADkH93iyir0mcOuaVFdAjBo=
=121f
-----END PGP SIGNATURE-----

 
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