EnGarde Secure Linux Security Advisory: xntp3

Date: Mon, 9 Apr 2001 12:39:32 -0400 (EDT)
From: security@guardiandigital.com
Subject: [ESA-20010409-01] xntp buffer overflow

+------------------------------------------------------------------------+
| EnGarde Secure Linux Security Advisory                  April 09, 2001 |
| http://www.engardelinux.org/                           ESA-20010409-01 |
|                                                                        |
| Package:  xntp3                                                        |
| Summary:  There is a potentially exploitable buffer overflow in the    |
|           xntp3 package.                                               |
+------------------------------------------------------------------------+

  EnGarde Secure Linux is a secure distribution of Linux that features
  improved access control, host and network intrusion detection, Web
  based secure remote management, complete e-commerce using AllCommerce,
  and integrated open source security tools.


OVERVIEW
- --------
  There is a very small buffer overflow in NTP daemon which shipped with
  EnGarde Secure Linux version 1.0.1.  


DETAIL
- ------
  The Network Time Protocol (NTP) is used to synchronize a computer's
  time with another reference time source.  The xntp3 package contains
  utilities and daemons which will synchronize your computer's time to
  Coordinated Universal Time (UTC) via the NTP protocol and NTP servers.

  By attacking a very small buffer with a very small set of shellcode, an
  attacker can potentially gain root access.  It has been reported that
  in some cases the only effect is the segfault of the ntpd.


SOLUTION
- --------
  All users running 'xntp3' should upgrade to the most recent version, as
  outlined in this advisory.  All updates can be found at:

    ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
    http://ftp.engardelinux.org/pub/engarde/stable/updates/

  To install the updated package, execute the command:

    rpm -Uvh <filename>

  To verify the signature of the updated packages, execute the command:

    rpm -Kv <filename>


UPDATED PACKAGES
- ----------------

  Source Packages:

    SRPMS/xntp3-5.93-1.0.16.src.rpm
      MD5 Sum:  853821174dad6b5a979f6eaae8ce815a

  Binary Packages:

    i686/xntp3-5.93-1.0.16.i686.rpm
      MD5 Sum:  3d7823343a0db6485a94fa16fad5afbd

  Please note that no i386 packages are available at this time.  i386 
  updates will be made available when our i386 distribution is made
  available.


REFERENCES
- ----------

  Guardian Digital's public key:
    http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY

  Credit for the discovery of this bug goes to:
    Przemyslaw Frasunek <venglin@FREEBSD.LUBLIN.PL>

  The Official Web Site:
    http://www.eecis.udel.edu/~ntp/

  SecurityFocus Bug ID:
    http://www.securityfocus.com/bid/2540

  Initial Announcement on BugTraq:
    http://www.securityfocus.com/templates/archive.pike?list=1&mid=174011

- ----------------------------------------------------------------------------
Author: Ryan W. Maple,  
Copyright 2001, Guardian Digital, Inc.