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Category:   Application (Generic)  >   Taylor UUCP Vendors:   Taylor, Ian Lance
(Debian Issues Fix) Taylor UUCP Input Validation Flaw Allows Local Users to Elevate Privileges
SecurityTracker Alert ID:  1002449
SecurityTracker URL:  http://securitytracker.com/id/1002449
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Sep 26 2001
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): uucp-1.06.1-25
Description:   A vulnerability was reported in Taylor UUCP. An argument handling flaw in a component of the Taylor UUCP package allows local users to obtain 'uucp' user and group privileges.

The uuxqt module (the UUCP execution daemon), which is designed to remove arguments that appear dangerous before execution, reportedly fails to remove long arguments. This allows a local user to cause cammands to be executed on the system with uucp privileges.

On OpenBSD 2.8 (and probably others), this reportedly indirectly allows root compromise. A local user can exploit the vulnerability to overwrite the uucp owned program /usr/bin/uustat, where arbitrary commands may be executed as part of the /etc/daily crontab script.

On Redhat 7.0 (and probably others), this reportedly indirectly allows a local user to create empty files as root execute commands as if logged in at the console.

Additional demonstration exploit information is provided in the Source Message.

Impact:   A local user can cause arbitrary commands to be executed on the system with 'uucp' user and group privileges, giving the local user 'uucp' level permissions on the system.
Solution:   The vendor has released a fix in version of 1.06.1-11potato1 for Debian GNU/Linux 2.2 using a patch that RedHat has provided. See the Source Message for the vendor's advisory containing directions on how to obtain the appropriate fix.
Vendor URL:  www.airs.com/ian/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Debian)

Message History:   This archive entry is a follow-up to the message listed below.
Sep 8 2001 Taylor UUCP Input Validation Flaw Allows Local Users to Elevate Privileges



 Source Message Contents

Subject:  [SECURITY] [DSA 079-1] New UUCP packages fix local exploit


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

- ----------------------------------------------------------------------------
Debian Security Advisory DSA 079-1                       security@debian.org
http://www.debian.org/security/                               Martin Schulze
September 24, 2001
- ----------------------------------------------------------------------------

Package        : uucp
Vulnerability  : uucp uid/gid access
Problem-Type   : local exploit
Debian-specific: no

zen-parse has found a problem with Taylor UUCP as distributed with
many GNU/Linux distributions.  It was possible to make `uux' execute
`uucp' with malicious commandline arguments which gives an attacker
access to files owned by uid/gid uucp.

This problem has been fixed in version of 1.06.1-11potato1 for Debian
GNU/Linux 2.2 by using a patch that RedHat has provided.

We recommend that you upgrade your uucp package immediately.

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 2.2 alias potato
- ------------------------------------


  Source archives:

    http://security.debian.org/dists/stable/updates/main/source/uucp_1.06.1-11potato1.diff.gz
      MD5 checksum: 4e2f02a4abd2ce86ffb0e154ef5d162b
    http://security.debian.org/dists/stable/updates/main/source/uucp_1.06.1-11potato1.dsc
      MD5 checksum: fd358e7e14f32ffa16cd3f2e6137b05c
    http://security.debian.org/dists/stable/updates/main/source/uucp_1.06.1.orig.tar.gz
      MD5 checksum: 390af5277915fcadbeee74d2f3038af9

  Alpha architecture:

    http://security.debian.org/dists/stable/updates/main/binary-alpha/uucp_1.06.1-11potato1_alpha.deb
      MD5 checksum: c1ad1038530a5ee1a6fb92fb90be287f

  ARM architecture:

    http://security.debian.org/dists/stable/updates/main/binary-arm/uucp_1.06.1-11potato1_arm.deb
      MD5 checksum: 5821d1b6b9bccfa7486183216ffc7dfa

  Intel ia32 architecture:

    http://security.debian.org/dists/stable/updates/main/binary-i386/uucp_1.06.1-11potato1_i386.deb
      MD5 checksum: deb9d76651686c2b0a2d51488e3cf0da

  Motorola 680x0 architecture:

    http://security.debian.org/dists/stable/updates/main/binary-m68k/uucp_1.06.1-11potato1_m68k.deb
      MD5 checksum: 37f78dceb1e6c3b492246c888a744af7

  PowerPC architecture:

    http://security.debian.org/dists/stable/updates/main/binary-powerpc/uucp_1.06.1-11potato1_powerpc.deb
      MD5 checksum: e2a81774e4cd6c1eabbcf1c8fbf2e406

  Sun Sparc architecture:

    http://security.debian.org/dists/stable/updates/main/binary-sparc/uucp_1.06.1-11potato1_sparc.deb
      MD5 checksum: 28148692a588b9b0c9b7598d0084fd2a


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

- ----------------------------------------------------------------------------
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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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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