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Debian: New unalz packages fix arbitrary code execution Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
Debian Ulf H�rnhammer from the Debian Audit Project discovered that unalz, a decompressor for ALZ archives, performs insufficient bounds checking when parsing file names. This can lead to arbitrary code execution if an attacker provides a crafted ALZ archive.
- --------------------------------------------------------------------------
Debian Security Advisory DSA 959-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
January 30th, 2006                      http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : unalz
Vulnerability  : buffer overflow
Problem-Type   : local (remote)
Debian-specific: no
CVE ID         : CVE-2005-3862
Debian Bug     : 340842

Ulf H�rnhammer from the Debian Audit Project discovered that unalz, a
decompressor for ALZ archives, performs insufficient bounds checking
when parsing file names.  This can lead to arbitrary code execution if
an attacker provides a crafted ALZ archive.

The old stable distribution (woody) does not contain unalz.

For the stable distribution (sarge) this problem has been fixed in
version 0.30.1

For the unstable distribution (sid) this problem will be fixed soon.

We recommend that you upgrade your unalz package.


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 3.1 alias sarge
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1.dsc
      Size/MD5 checksum:      505 6946e7c6ae2e663674cb968a17517d6b
    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1.tar.gz
      Size/MD5 checksum:   108993 9b45066980a87f11db43f24b0756be33

  Alpha architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_alpha.deb
      Size/MD5 checksum:    54350 5cf460c260a651fa6c48a39a350fea19

  AMD64 architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_amd64.deb
      Size/MD5 checksum:    47924 21585b3182e29c28c4871bd75d2b8565

  ARM architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_arm.deb
      Size/MD5 checksum:    49050 7e2bb36975ff0f6e601be3c4ac5de5a9

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_i386.deb
      Size/MD5 checksum:    42794 c9ca20d6840ca8381eee1dcfa34ad89a

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_ia64.deb
      Size/MD5 checksum:    77534 4e626bf47842d551ed1761336259fcfe

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_hppa.deb
      Size/MD5 checksum:    51558 34d2c5c50af71e9ade2c3b608041cbc5

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_m68k.deb
      Size/MD5 checksum:    42514 747eeb6b49dc1c7e43f6d0e4034fa2c7

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_mips.deb
      Size/MD5 checksum:    54364 9e797dbb849cbe5f65f61d5e052902e5

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_mipsel.deb
      Size/MD5 checksum:    53938 aef1b01344791cdefed5f837b66bf9aa

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_powerpc.deb
      Size/MD5 checksum:    45412 621dafe9070b461d0f86655a1dda9507

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_s390.deb
      Size/MD5 checksum:    49970 2f6a285270fcd8084f9e2948e87ebfc4

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/u/unalz/unalz_0.30.1_sparc.deb
      Size/MD5 checksum:    46612 2142655456c03385e69d156a7831005c


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

- ---------------------------------------------------------------------------------
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
 
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