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Category:   Application (Generic)  >   Squid Vendors:   [Multiple Authors/Vendors]
(Conectiva Issues Fix) Squid Proxy Caching Server Can Be Crashed by Remote Users with Mkdir PUT Requests
SecurityTracker Alert ID:  1002458
SecurityTracker URL:  http://securitytracker.com/id/1002458
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Sep 27 2001
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.3 and 2.4 series
Description:   A denial of service vulnerability was reported in the Squid proxy caching server. A remote user can cause the proxy caching service to crash.

The following type of request that requires a directory to be created will cause the Squid proxy to crash:

PUT ftp://cgi-lexus:yGDgX9@[ftpserveraddress]/WEB-INF/1/2/1/ HTTP/1.1

The following log messages will be created as a result of this type of command:

Sep 10 14:17:11 azimuth (squid): xstrdup: tried to dup a NULL pointer!
Sep 10 14:17:11 azimuth squid[3027]: Squid Parent: child process 12742 exited due to signal 6
Sep 10 14:17:14 azimuth squid[3027]: Squid Parent: child process 12745 started

It is reported that the process will reload within a few seconds and return to normal operation.

Impact:   A remote user can cause the Squid proxy to crash.
Solution:   The vendor has released a fix. See the Source Message for the vendor's advisory containing directions on how to obtain the appropriate fix.
Vendor URL:  www.squid-cache.org/bugs/show_bug.cgi?id=233 (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Linux (Any), UNIX (Any)
Underlying OS Comments:  Tested on RedHat 6.2 and 7.1.

Message History:   This archive entry is a follow-up to the message listed below.
Sep 21 2001 Squid Proxy Caching Server Can Be Crashed by Remote Users with Mkdir PUT Requests



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2001:426] Conectiva Linux Security Announcement - squid


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

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

PACKAGE   : squid
SUMMARY   : Squid multiple vulnerabilities
DATE      : 2001-09-26 16:11:00
ID        : CLA-2001:426
RELEVANT
RELEASES  : 4.0, 4.0es, 4.1, 4.2, 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0

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

DESCRIPTION
 Squid is a caching/proxy daemon for HTTP/FTP/Gopher. This update
 fixes two vulnerabilities:
 
 1. Vladimir Ivaschenko found a bug[1] which allows a remote attacker
 to cause a DoS on the squid proxy service by sending mkdir ftp
 requests.
 
 2. Takashi Taniguchi found a bug[2] that allows malicious users to
 do portscanning and other suspect activities using the proxy when
 it's configured in "http accelerator mode".
 
 Also, this update improves the squid script service handling
 (start/stop/restart/reload) and removes the suid bit from the PAM
 squid auth module on CL 7.0.
 
 Note: Conectiva Linux 7.0 is not affected by bug #2.
 
 REFERENCES:
  1. http://www.squid-cache.org/bugs/show_bug.cgi?id=233
  2.
 http://www.squid-cache.org/Versions/v2/2.3/bugs/#squid-2.3.stable4-accel_only_access


SOLUTION
 It is recommended that all squid users upgrade to the latest
 packages. This update will automatically restart the service if it is
 already running.


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/4.0/i386/squid-2.3.1-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0/SRPMS/squid-2.3.1-2U40_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/squid-2.3.1-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/SRPMS/squid-2.3.1-2U40_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/squid-2.3.1-2U41_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/SRPMS/squid-2.3.1-2U41_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/squid-2.3.1-2U42_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/SRPMS/squid-2.3.1-2U42_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/squid-2.3.1-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/squid-2.3.1-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/squid-2.3.3-5U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/squid-2.3.3-5U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/squid-2.3.3-10U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/squid-2.3.3-10U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/squid-2.4.1-4U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/squid-auth-2.4.1-4U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/squid-doc-2.4.1-4U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/squid-templates-2.4.1-4U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/squid-2.4.1-4U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/squid-2.3.1-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/squid-2.3.1-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/squid-2.3.1-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/squid-2.3.1-2U50_1cl.src.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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Comment: For info see http://www.gnupg.org

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