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Category:   Application (Generic)  >   Webalizer Vendors:   Barrett, Bradford L.
(Engarde Issues Fix) Webalizer Buffer Overflow Allows Remote Users to Execute Arbitrary Code on the Server via Reverse DNS Lookups
SecurityTracker Alert ID:  1004142
SecurityTracker URL:  http://securitytracker.com/id/1004142
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 24 2002
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.01-09, 2.01-06
Description:   A buffer overflow vulnerability was reported in Webalizer, a log file analysis tool. A remote user can cause arbitrary code to be executed on the server.

If Webalizer is configured to perform reverse DNS lookups (which is apparently not the default configuration), a remote user with control over a DNS service can cause arbitrary code to be executed by Webalizer. No further details were provided.

The vendor has reportedly been notified.

Impact:   A remote user with control over a DNS server can cause Webalizer to execute arbitrary code on the Webalizer host when performing a reverse DNS lookup.
Solution:   The vendor has released a fix. Users of the EnGarde Professional edition can use the Guardian Digital Secure Network to update their systems automatically.

EnGarde Community users should upgrade to the most recent version as outlined in this advisory. Updates may be obtained from:

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

Before upgrading the package, the machine must either:

a) be booted into a "standard" kernel; or
b) have LIDS disabled.

To disable LIDS, execute the command:

# /sbin/lidsadm -S -- -LIDS_GLOBAL

To install the updated package, execute the command:

# rpm -Uvh <filename>

You must now update the LIDS configuration by executing the command:

# /usr/sbin/config_lids.pl

To re-enable LIDS (if it was disabled), execute the command:

# /sbin/lidsadm -S -- +LIDS_GLOBAL

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

# rpm -Kv <filename>


These updated packages are for EnGarde Secure Linux Community Edition:

Source Packages:

SRPMS/webalizer-2.01-1.0.4.src.rpm
MD5 Sum: 4b182641716929e667b532b34143a56f

Binary Packages:

i386/webalizer-2.01-1.0.4.i386.rpm
MD5 Sum: 26d607aa844675e643ac1cbb37c66363

i686/webalizer-2.01-1.0.4.i686.rpm
MD5 Sum: 5da5952a4d1ff859e4d96b9d8ab02793

Vendor URL:  www.mrunix.net/webalizer/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (EnGarde)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 15 2002 Webalizer Buffer Overflow Allows Remote Users to Execute Arbitrary Code on the Server via Reverse DNS Lookups



 Source Message Contents

Subject:  [ESA-20020423-009] webalizer contains a potentially exploitable




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


+------------------------------------------------------------------------+
| EnGarde Secure Linux Security Advisory                  April 23, 2002 |
| http://www.engardelinux.org/                          ESA-20020423-009 |
|                                                                        |
| Package: webalizer                                                     |
| Summary: webalizer contains a potentially exploitable buffer overflow. |
+------------------------------------------------------------------------+

  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 potentially exploitable buffer overflow in webalizer which
  could allow an attacker to compromise a host by spoofing reverse DNS
  queries.

DETAIL
- ------
  The Webalizer is a fast, free web server log file analysis program. It
  produces highly detailed, easily configurable usage reports in HTML
  format, for viewing with a standard web browser. 

  Webalizer also has the ability to perform reverse DNS lookups.  An
  attacker with control over the victims DNS may spoof responses thus
  triggering a buffer overflow, potentially leading to a root compromise.

SOLUTION
- --------
  Users of the EnGarde Professional edition can use the Guardian Digital
  Secure Network to update their systems automatically.

  EnGarde Community users should upgrade to the most recent version
  as outlined in this advisory.  Updates may be obtained from:

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

  Before upgrading the package, the machine must either:

    a) be booted into a "standard" kernel; or
    b) have LIDS disabled.

  To disable LIDS, execute the command:

    # /sbin/lidsadm -S -- -LIDS_GLOBAL

  To install the updated package, execute the command:

    # rpm -Uvh <filename>

  You must now update the LIDS configuration by executing the command:

    # /usr/sbin/config_lids.pl

  To re-enable LIDS (if it was disabled), execute the command:

    # /sbin/lidsadm -S -- +LIDS_GLOBAL

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

    # rpm -Kv <filename>

UPDATED PACKAGES
- ----------------
  These updated packages are for EnGarde Secure Linux Community
  Edition.

  Source Packages:

    SRPMS/webalizer-2.01-1.0.4.src.rpm
      MD5 Sum: 4b182641716929e667b532b34143a56f

  Binary Packages:

    i386/webalizer-2.01-1.0.4.i386.rpm
      MD5 Sum: 26d607aa844675e643ac1cbb37c66363

    i686/webalizer-2.01-1.0.4.i686.rpm
      MD5 Sum: 5da5952a4d1ff859e4d96b9d8ab02793

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

  Credit for the discovery of this bug goes to:
    Spybreak <spybreak@host.sk>

  The Webalizer's Official Web Site:
    http://www.webalizer.org/

  Security Contact:    security@guardiandigital.com
  EnGarde Advisories:  http://www.engardelinux.org/advisories.html

- --------------------------------------------------------------------------
$Id: ESA-20020423-009-webalizer,v 1.1 2002/04/23 16:46:06 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple, <ryan@guardiandigital.com> 
Copyright 2002, Guardian Digital, Inc.

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Comment: For info see http://www.gnupg.org

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------------------------------------------------------------------------
     To unsubscribe email engarde-security-request@engardelinux.org
         with "unsubscribe" in the subject of the message.

Copyright(c) 2001 Guardian Digital, Inc.                EnGardeLinux.org
------------------------------------------------------------------------


 
 


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