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Category:   Application (Generic)  >   Squid Vendors:   [Multiple Authors/Vendors]
(Turbolinux Issues Fix) Squid Proxy Caching Server Can Be Crashed by Remote Users with Mkdir PUT Requests
SecurityTracker Alert ID:  1003355
SecurityTracker URL:  http://securitytracker.com/id/1003355
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 25 2002
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. Update the package from the Turbolinux ftp server by running the following command:

rpm -Uvh ftp://ftp.turbolinux.com/pub/updates/6.0/security/<rpm>

Where <rpm> is the following:

squid-2.4.STABLE2-3.i386.rpm

The source RPM can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/ squid-2.4.STABLE2-3.src.rpm

**Note: You must rebuild and install the RPM if you choose to download
and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE
THE SECURITY HOLE.

Please verify the MD5 checksums of the updates before you install:

MD5 sum Package Name
---------------------------------------------------------------------------
8d163dfdb90a42c46a5c169b2dc0d4f4 squid-2.4.STABLE2-3.i386.rpm
c7ee0677b88db07507fbde69b696bec1 squid-2.4.STABLE2-3.src.rpm

Vendor URL:  www.squid-cache.org/bugs/show_bug.cgi?id=233 (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Linux (Turbo Linux)
Underlying OS Comments:  TL 6.x, All Turbolinux versions, 2.4.STABLE2-1 and earlier

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:  [TL-Security-Announce] squid-2.4.STABLE2-3 TLSA2002003



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___________________________________________________________________________

                        Turbolinux Security Announcement

        Package : squid
        Vulnerable Packages: All versions previous to 2.4.STABLE2-2
        Date: Thu Jan 24 18:32:20 PST 2002

        Affected Turbolinux versions:TL 6.x,
                                     All Turbolinux versions
                                     2.4.STABLE2-1 and earlier

        Turbolinux Advisory ID#:  TLSA2002003

   Credits: Vladimir Ivaschenko
            http://www.squid-cache.org/bugs/show_bug.cgi?id=233
___________________________________________________________________________

A security hole was discovered in the package mentioned above.
Please update the package in your installation as soon as possible.
___________________________________________________________________________

1. Problem Summary

   Squid has a flaw in the code to handle FTP PUT commands: when a mkdir-only
   request was done squid would detect an internal error and exit.
   Squid script cannot use the restart command. Because when stop command 
   isn't finished, start command is started.

2. Impact

   Vulnerable.

3. Solution

  Update the package from our ftp server by running the following command:

  rpm -Uvh ftp://ftp.turbolinux.com/pub/updates/6.0/security/<rpm>

  Where <rpm> is the following:

  squid-2.4.STABLE2-3.i386.rpm

  The source RPM can be downloaded here:

  ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/ squid-2.4.STABLE2-3.src.rpm

  **Note: You must rebuild and install the RPM if you choose to download
  and install the SRPM.  Simply installing the SRPM alone WILL NOT CLOSE
  THE SECURITY HOLE.

 Please verify the MD5 checksums of the updates before you install:

  MD5 sum                               Package Name
---------------------------------------------------------------------------
8d163dfdb90a42c46a5c169b2dc0d4f4  squid-2.4.STABLE2-3.i386.rpm
c7ee0677b88db07507fbde69b696bec1  squid-2.4.STABLE2-3.src.rpm
___________________________________________________________________________

These packages are GPG signed by Turbolinux for security. Our key
is available here:

 http://www.turbolinux.com/security/tlgpgkey2002-01-09.asc

To verify a package, use the following command:

 rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

 rpm --checksig --nogpg name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.

___________________________________________________________________________
You can find more updates on our ftp server:

   ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation
   and Server security updates
   ftp://ftp.turbolinux.com/pub/updates/7.0/security/ for TL7.0 Workstation
   and Server security updates

Our webpage for security announcements:

   http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

   security@turbolinux.com
___________________________________________________________________________

Subscribe to the Turbolinux Security Mailing lists:

  TL-security - A moderated list for discussing security issues
                Turbolinux products.
  Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

  TL-security-announce - An announce-only mailing list for security updates
  and alerts.
  Subscribe at:

      http://www.turbolinux.com/mailman/listinfo/tl-security-announce
___________________________________________________________________________


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_______________________________________________
TL-Security-Announce mailing list
TL-Security-Announce@www.turbolinux.com
http://www.turbolinux.com/mailman/listinfo/tl-security-announce

 
 


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