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Category:   Application (Generic)  >   Squid Vendors:   [Multiple Authors/Vendors]
(Red Hat Issues Fix) Squid Proxy Caching Server Can Be Crashed by Remote Users with Mkdir PUT Requests
SecurityTracker Alert ID:  1002488
SecurityTracker URL:  http://securitytracker.com/id/1002488
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 5 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 following fixed versions are available:

Red Hat Linux 6.2:

SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/squid-2.3.STABLE4-10.6.2.src.rpm

alpha:
ftp://updates.redhat.com/6.2/en/os/alpha/squid-2.3.STABLE4-10.6.2.alpha.rpm

i386:
ftp://updates.redhat.com/6.2/en/os/i386/squid-2.3.STABLE4-10.6.2.i386.rpm

sparc:
ftp://updates.redhat.com/6.2/en/os/sparc/squid-2.3.STABLE4-10.6.2.sparc.rpm

Red Hat Linux 7.0:

SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/squid-2.3.STABLE4-10.7.0.src.rpm

alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/squid-2.3.STABLE4-10.7.0.alpha.rpm

i386:
ftp://updates.redhat.com/7.0/en/os/i386/squid-2.3.STABLE4-10.7.0.i386.rpm

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/squid-2.3.STABLE4-10.7.1.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/squid-2.3.STABLE4-10.7.1.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/squid-2.3.STABLE4-10.7.1.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/squid-2.3.STABLE4-10.7.1.ia64.rpm

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:  [RHSA-2001:113-02] New squid packages available to fix FTP-based DoS


---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          New squid packages available to fix FTP-based DoS
Advisory ID:       RHSA-2001:113-02
Issue date:        2001-09-25
Updated on:        2001-09-27
Product:           Red Hat Linux
Keywords:          squid FTP DoS
Cross references:  
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

New squid packages are available that fix a potential DoS in Squid's FTP
handling code. It is recommened that squid users update to the fixed
packages.

The packages for Red Hat Linux 6.2 also fix the problem described in
RHSA-2001:097-04; it was later discovered that Red Hat Linux 6.2 is
vulnerable to the same problem in accelerator-only mode.

2. Relevant releases/architectures:

Red Hat Linux 6.2 - alpha, i386, sparc

Red Hat Linux 7.0 - alpha, i386

Red Hat Linux 7.1 - alpha, i386, ia64

3. Problem description:

Certain FTP requests could cause the Squid daemon to abort, making it
unavailable for a period of seconds. If enough of these requests are sent
in a short period of time, the Squid daemon will not be restarted.

Thanks go to Vladimir Ivaschenko for bringing this to our attention, and
to Henrik Nordstrom and the Squid team for providing a fix.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

53906 - Squid allows all proxy requests in accelerator mode

6. RPMs required:

Red Hat Linux 6.2:

SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/squid-2.3.STABLE4-10.6.2.src.rpm

alpha:
ftp://updates.redhat.com/6.2/en/os/alpha/squid-2.3.STABLE4-10.6.2.alpha.rpm

i386:
ftp://updates.redhat.com/6.2/en/os/i386/squid-2.3.STABLE4-10.6.2.i386.rpm

sparc:
ftp://updates.redhat.com/6.2/en/os/sparc/squid-2.3.STABLE4-10.6.2.sparc.rpm

Red Hat Linux 7.0:

SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/squid-2.3.STABLE4-10.7.0.src.rpm

alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/squid-2.3.STABLE4-10.7.0.alpha.rpm

i386:
ftp://updates.redhat.com/7.0/en/os/i386/squid-2.3.STABLE4-10.7.0.i386.rpm

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/squid-2.3.STABLE4-10.7.1.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/squid-2.3.STABLE4-10.7.1.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/squid-2.3.STABLE4-10.7.1.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/squid-2.3.STABLE4-10.7.1.ia64.rpm



7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
92bf7d39e574dad6e6952b6b89851fe5 6.2/en/os/SRPMS/squid-2.3.STABLE4-10.6.2.src.rpm
e693299406aba9b573354fe29e998a29 6.2/en/os/alpha/squid-2.3.STABLE4-10.6.2.alpha.rpm
ca6952e0be177b25d0e90778ab456f6b 6.2/en/os/i386/squid-2.3.STABLE4-10.6.2.i386.rpm
505fbeeaaf873f52a51e8a0a3e5562ae 6.2/en/os/sparc/squid-2.3.STABLE4-10.6.2.sparc.rpm
2006fdfdc57bc09337be92a04583e00d 7.0/en/os/SRPMS/squid-2.3.STABLE4-10.7.0.src.rpm
0784ce226770a50c4f13640b6cc7d01e 7.0/en/os/alpha/squid-2.3.STABLE4-10.7.0.alpha.rpm
a8d303d2743c0703d3bb2c6502488824 7.0/en/os/i386/squid-2.3.STABLE4-10.7.0.i386.rpm
08a518df230a1f9cf17ecbf2a273a4b8 7.1/en/os/SRPMS/squid-2.3.STABLE4-10.7.1.src.rpm
fe4e72902f8aaf5dec0085c91b0b0e0d 7.1/en/os/alpha/squid-2.3.STABLE4-10.7.1.alpha.rpm
c7e2f184cffdd911411aec7908c937d3 7.1/en/os/i386/squid-2.3.STABLE4-10.7.1.i386.rpm
5883320b3d07b2861122e631f59f8b24 7.1/en/os/ia64/squid-2.3.STABLE4-10.7.1.ia64.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/about/contact/pgpkey.html

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:

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


Copyright(c) 2000, 2001 Red Hat, Inc.



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