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Slackware Linux Advisory: kernel

Dec 02, 2003, 20:23 (0 Talkback[s])

[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