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Category:   Application (Generic)  >   Webalizer Vendors:   Barrett, Bradford L.
(Conectiva Issues Fix) Webalizer Log File Analyzer Cross-Site Scripting Hole Allows Remote Users to Cause Arbitrary But Trusted Code to Be Executed By Another User When Viewing Webalizer Reports
SecurityTracker Alert ID:  1002723
SecurityTracker URL:  http://securitytracker.com/id/1002723
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 9 2001
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.01-06; possibly earlier versions (which were not tested)
Description:   A cross-site scripting vulnerability was reported in The Webalizer, a web server log file analysis package. A remote user could cause scripts to be executed on another user's host in certain situations.

Two vulnerabilities were reported that may allow a remote user to cause scripts to be executed on the browser of a user viewing the HTML reports. The scripts will appear to originate from the Webalizer server. A remote user can inject HTML tags into Webalizer reports such that when another user views the compromised report, the tag will be processed.

It is reported that The Webalizer does not filter data returned by the operating system resolver library when performing a reverse address resolution. A remote user that has control over a DNS reverse address mapping zone can create an address with a PTR record pointing to a name containing HTML tags. Then, the remote user can access a web server that uses Webalizer for log file analysis. When the Webalizer program is subsequently run, the address of the web server access will resolve to a name containing the HTML tags, which will be inserted into the HTML reports without filtering. This exploit is apparently difficult to execute, as most modern resolver libraries apparently refuse to return host names containing HTML meta-characters.

It is reported that a remote user can send an HTTP "Referrer" header containing HTML meta-characters to a web server. When the Webalizer compares the referred URLs to a list of search engine URLs, the keywords used by the apparent search engine are extracted and stored without filtering in the HTML files on the server.

Impact:   A remote user can cause arbitrary scripts to be executed on the browser of a user viewing Webalizer reports. The code will appear to come from the presumably trusted Webalizer reports server. The code may access cookies and other user information.
Solution:   The vendor has released a fix:

ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/webalizer-2.01_09-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/webalizer-2.01_09-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/webalizer-doc-2.01_09-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/webalizer-2.01_09-1U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/webalizer-2.01_09-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/webalizer-doc-2.01_09-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/webalizer-2.01_09-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/webalizer-2.01_09-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/webalizer-doc-2.01_09-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/webalizer-2.01_09-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/webalizer-2.01_09-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/webalizer-doc-2.01_09-1U70_1cl.i386.rpm

Users of Conectiva Linux version 6.0 or higher may use apt to perform upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):

rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- run: apt-get update
- after that, execute: apt-get upgrade

See the Source Message for the vendor's advisory containing additional directions on how to apply the appropriate fix.

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

Message History:   This archive entry is a follow-up to the message listed below.
Oct 25 2001 Webalizer Log File Analyzer Cross-Site Scripting Hole Allows Remote Users to Cause Arbitrary But Trusted Code to Be Executed By Another User When Viewing Webalizer Reports



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2001:435] Conectiva Linux Security Announcement - webalizer


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

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : webalizer
SUMMARY   : Webalizer cross site scripting vulnerability
DATE      : 2001-11-09 13:30:00
ID        : CLA-2001:435
RELEVANT
RELEASES  : 5.0, 5.1, 6.0, 7.0

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

DESCRIPTION
 "The Webalizer" is a web server log file analysis program which
 produces usage statistics in HTML format.
 
 Magnux Software[1] discovered and publicized[2] a cross site
 scripting vulnerability[3] in webalizer that allows an attacker to
 insert malicious HTML tags directly into the generated reports. Doing
 so, he/she can force the viewer (using a web browser) to visit some
 URL or even execute some unwanted code (like javascripts), which is
 an unexpected behaviour.


SOLUTION
 All webalizer users should apply the upgrade.
 
 
 REFERENCES:
 1. http://magnux.com/
 2. http://www.securityfocus.com/archive/1/222556
 3. http://www.securityfocus.com/bid/3473


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/webalizer-2.01_09-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/webalizer-2.01_09-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/webalizer-doc-2.01_09-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/webalizer-2.01_09-1U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/webalizer-2.01_09-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/webalizer-doc-2.01_09-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/webalizer-2.01_09-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/webalizer-2.01_09-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/webalizer-doc-2.01_09-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/webalizer-2.01_09-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/webalizer-2.01_09-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/webalizer-doc-2.01_09-1U70_1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 Users of Conectiva Linux version 6.0 or higher may use apt to perform 
 upgrades of RPM packages:
 - add the following line to /etc/apt/sources.list if it is not there yet
   (you may also use linuxconf to do this):

 rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en


- -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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