(Debian Issues Fix for HPPA) Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges


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Debian Security Advisory DSA 470-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
April 1st, 2004                         http://www.debian.org/security/faq
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Package        : kernel-image-2.4.17-hppa
Vulnerability  : several vulnerabilities
Problem-Type   : local
Debian-specific: no
CVE ID         : CAN-2003-0961 CAN-2003-0985 CAN-2004-0077

Several local root exploits have been discovered recently in the Linux
kernel.  This security advisory updates the mips kernel 2.4.19 for
Debian GNU/Linux.  The Common Vulnerabilities and Exposures project
identifies the following problems that are fixed with this update:

CAN-2003-0961:

   An integer overflow in brk() system call (do_brk() function) for
   Linux allows a local attacker to gain root privileges.  Fixed
   upstream in Linux 2.4.23.

CAN-2003-0985:

   Paul Starzetz discovered a flaw in bounds checking in mremap() in
   the Linux kernel (present in version 2.4.x and 2.6.x) which may
   allow a local attacker to gain root privileges.  Version 2.2 is not
   affected by this bug.  Fixed upstream in Linux 2.4.24.

CAN-2004-0077:

   Paul Starzetz and Wojciech Purczynski of isec.pl discovered a
   critical security vulnerability in the memory management code of
   Linux inside the mremap(2) system call.  Due to missing function
   return value check of internal functions a local attacker can gain
   root privileges.  Fixed upstream in Linux 2.4.25 and 2.6.3.

For the stable distribution (woody) these problems have been fixed in
version 32.3 of kernel-image-2.4.17-hppa.

For the unstable distribution (sid) these problems have been fixed in
version 2.4.25-1 of kernel-image-2.4.25-hppa.

We recommend that you upgrade your Linux kernel packages immediately.


Upgrade Instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 3.0 alias woody
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  Source archives:

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-image-2.4.17-hppa_32.3.dsc
      Size/MD5 checksum:      713 f5b7956a75870aaff51ccb52c96a0ab2
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-image-2.4.17-hppa_32.3.tar.gz
      Size/MD5 checksum: 29958048 44cb813807b9b1c45984fadfc18d4ba1

  Architecture independent components:

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-source-2.4.17-hppa_32.3_all.deb
      Size/MD5 checksum: 24109698 cefc1a3ebfce0d30f97b556ed62674d4

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-headers-2.4.17-hppa_32.3_hppa.deb
      Size/MD5 checksum:  3531296 605f593d9648fd2ab1aa2d6f106263af
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-image-2.4.17-32_32.3_hppa.deb
      Size/MD5 checksum:  2737992 793396152e7dea3f9a1ea8ea10c4dbe7
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-image-2.4.17-32-smp_32.3_hppa.deb
      Size/MD5 checksum:  2870174 2f2df476a902378a9efa96a79367eed2
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-image-2.4.17-64_32.3_hppa.deb
      Size/MD5 checksum:  3024282 1a687ccbedbba298a7e98ba7d2b20650
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.17-hppa/kernel-image-2.4.17-64-smp_32.3_hppa.deb
      Size/MD5 checksum:  3165702 795b734b1e17a75a76c40af8f49e6ec7


  These files will probably be moved into the stable distribution on
  its next revision.

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For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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