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Category:   Application (File Transfer/Sharing)  >   zsync Vendors:   Phipps, Colin
(Debian Issues Fix for zsync) Zlib Buffer Overflow in inflate_table() May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1014840
SecurityTracker URL:  http://securitytracker.com/id/1014840
CVE Reference:   CVE-2005-2096   (Links to External Site)
Date:  Sep 2 2005
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A buffer overflow was reported in zlib in the processing of compressed data streams. A remote user may be able to cause denial of service conditions or execute arbitrary code on the target system. zsync is affected.

A user can create a specially crafted compressed data stream that, when processed by an application using zlib, will trigger an overflow in the inflate_table() function and cause the application to crash or execute arbitrary code.

The vulnerability resides in 'inftrees.c'.

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered this vulnerability.

Impact:   A user can cause an application using zlib to crash or execute arbitrary code. The specific impact depends on the application.
Solution:   Debian has issued a fix for zsync, which is affected by the zlib vulnerability.

Debian GNU/Linux 3.1 alias sarge:

Source archives:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1.dsc
Size/MD5 checksum: 742 38abbfacbf93f57692641a0f257abe4e
http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1.diff.gz
Size/MD5 checksum: 6213 224eae057a1eebdd3ffe16e6e3d584e6
http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3.orig.tar.gz
Size/MD5 checksum: 241726 71efef80525276990cf8af97ee2b8f97

Alpha architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_alpha.deb
Size/MD5 checksum: 120612 0efd2b252f7a2eebac03d04aee7bff87

AMD64 architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_amd64.deb
Size/MD5 checksum: 99560 ede8508b5d555b6be89c5adbbea49c20

ARM architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_arm.deb
Size/MD5 checksum: 100420 713b7d689f4ccdf4317c255dd0de7e6f

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_i386.deb
Size/MD5 checksum: 98414 bb4ff605c6e3b94f23dd0986ca55e450

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_ia64.deb
Size/MD5 checksum: 139370 91cef962076eb5d66ddda86e1ca1e8f8

HP Precision architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_hppa.deb
Size/MD5 checksum: 105062 ba01f3b644ea1be05e51d3d07b00d363

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_m68k.deb
Size/MD5 checksum: 85176 ec83816290778ca23005cbcf001962ed

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_mips.deb
Size/MD5 checksum: 106840 bdd9b5d16ed84330292a97eb01deb381

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_mipsel.deb
Size/MD5 checksum: 107912 bf7c5dfcac00e250efefe59959f47deb

PowerPC architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_powerpc.deb
Size/MD5 checksum: 100460 7126e64533e31ccd1be3302772ca4158

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_s390.deb
Size/MD5 checksum: 103472 b9712abdbaa529ab5ed20854b5b70406

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_sparc.deb
Size/MD5 checksum: 98614 534233dd79188ea592f23a0b00f5d524

Vendor URL:  zsync.moria.org.uk/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Debian)
Underlying OS Comments:  3.1

Message History:   This archive entry is a follow-up to the message listed below.
Jul 6 2005 Zlib Buffer Overflow in inflate_table() May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [Full-disclosure] [SECURITY] [DSA 797-1] New zsync packages fix DOS


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

- --------------------------------------------------------------------------
Debian Security Advisory DSA 797-1                     security@debian.org
http://www.debian.org/security/                              Michael Stone
September 1st, 2005                     http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : zsync
Vulnerability  : DOS
Problem-Type   : buffer overflow
Debian-specific: no
CVE ID         : CAN-2005-1849, CAN-2005-2096

zsync, a file transfer program, includes a modified local copy of
the zlib library, and is vulnerable to certain bugs fixed previously
in the zlib package.

The old stable distribution (woody) does not contain the zsync
package.

For the stable distribution (sarge) this problem has been fixed in
version 0.3.3-1.sarge.1.

For the unstable distribution (sid) this problem has been fixed in
version 0.4.0-2.

We recommend that you upgrade your zsync 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/z/zsync/zsync_0.3.3-1.sarge.1.dsc
      Size/MD5 checksum:      742 38abbfacbf93f57692641a0f257abe4e
    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1.diff.gz
      Size/MD5 checksum:     6213 224eae057a1eebdd3ffe16e6e3d584e6
    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3.orig.tar.gz
      Size/MD5 checksum:   241726 71efef80525276990cf8af97ee2b8f97

  Alpha architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_alpha.deb
      Size/MD5 checksum:   120612 0efd2b252f7a2eebac03d04aee7bff87

  AMD64 architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_amd64.deb
      Size/MD5 checksum:    99560 ede8508b5d555b6be89c5adbbea49c20

  ARM architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_arm.deb
      Size/MD5 checksum:   100420 713b7d689f4ccdf4317c255dd0de7e6f

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_i386.deb
      Size/MD5 checksum:    98414 bb4ff605c6e3b94f23dd0986ca55e450

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_ia64.deb
      Size/MD5 checksum:   139370 91cef962076eb5d66ddda86e1ca1e8f8

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_hppa.deb
      Size/MD5 checksum:   105062 ba01f3b644ea1be05e51d3d07b00d363

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_m68k.deb
      Size/MD5 checksum:    85176 ec83816290778ca23005cbcf001962ed

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_mips.deb
      Size/MD5 checksum:   106840 bdd9b5d16ed84330292a97eb01deb381

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_mipsel.deb
      Size/MD5 checksum:   107912 bf7c5dfcac00e250efefe59959f47deb

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_powerpc.deb
      Size/MD5 checksum:   100460 7126e64533e31ccd1be3302772ca4158

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_s390.deb
      Size/MD5 checksum:   103472 b9712abdbaa529ab5ed20854b5b70406

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/z/zsync/zsync_0.3.3-1.sarge.1_sparc.deb
      Size/MD5 checksum:    98614 534233dd79188ea592f23a0b00f5d524


  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
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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