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

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0249
                Moderate: squid security and bug fix update
                             22 February 2013

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           squid
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 6
                   Red Hat Enterprise Linux WS/Desktop 6
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-5643  

Reference:         ESB-2012.1199.2

Original Bulletin: 
   https://rhn.redhat.com/errata/RHSA-2013-0505.html

- --------------------------BEGIN INCLUDED TEXT--------------------

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: squid security and bug fix update
Advisory ID:       RHSA-2013:0505-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0505.html
Issue date:        2013-02-21
CVE Names:         CVE-2012-5643 
=====================================================================

1. Summary:

Updated squid packages that fix one security issue and several bugs are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Squid is a high-performance proxy caching server for web clients that
supports FTP, Gopher, and HTTP data objects.

A denial of service flaw was found in the way the Squid Cache Manager
processed certain requests. A remote attacker who is able to access the
Cache Manager CGI could use this flaw to cause Squid to consume an
excessive amount of memory. (CVE-2012-5643)

This update also fixes the following bugs:

* Due to a bug in the ConnStateData::noteMoreBodySpaceAvailable() function,
child processes of Squid terminated upon encountering a failed assertion.
An upstream patch has been provided and Squid child processes no longer
terminate. (BZ#805879)

* Due to an upstream patch, which renamed the HTTP header controlling
persistent connections from "Proxy-Connection" to "Connection", the NTLM
pass-through authentication does not work, thus preventing login. This
update adds the new "http10" option to the squid.conf file, which can be
used to enable the change in the patch. This option is set to "off" by
default. When set to "on", the NTLM pass-through authentication works
properly, thus allowing login attempts to succeed. (BZ#844723)

* When the IPv6 protocol was disabled and Squid tried to handle an HTTP GET
request containing an IPv6 address, the Squid child process terminated due
to signal 6. This bug has been fixed and such requests are now handled as
expected. (BZ#832484)

* The old "stale if hit" logic did not account for cases where the stored
stale response became fresh due to a successful re-validation with the
origin server. Consequently, incorrect warning messages were returned. Now,
Squid no longer marks elements as stale in the described scenario.
(BZ#847056)

* When squid packages were installed before samba-winbind, the wbpriv group
did not include Squid. Consequently, NTLM authentication calls failed. Now,
Squid correctly adds itself into the wbpriv group if samba-winbind is
installed before Squid, thus fixing this bug. (BZ#797571)

* In FIPS mode, Squid was using private MD5 hash functions for user
authentication and network access. As MD5 is incompatible with FIPS mode,
Squid could fail to start. This update limits the use of the private MD5
functions to local disk file hash identifiers, thus allowing Squid to work
in FIPS mode. (BZ#833086)

* Under high system load, the squid process could terminate unexpectedly
with a segmentation fault during reboot. This update provides better memory
handling during reboot, thus fixing this bug. (BZ#782732)

* Squid incorrectly set the timeout limit for client HTTP connections with
the value for server-side connections, which is much higher, thus creating
unnecessary delays. With this update, Squid uses a proper value for the
client timeout limit. (BZ#798090)

* Squid did not properly release allocated memory when generating error
page contents, which caused memory leaks. Consequently, the Squid proxy
server consumed a lot of memory within a short time period. This update
fixes this memory leak. (BZ#758861)

* Squid did not pass the ident value to a URL rewriter that was configured
using the "url_rewrite_program" directive. Consequently, the URL rewriter
received the dash character ("") as the user value instead of the correct
user name. Now, the URL rewriter receives the correct user name in the
described scenario. (BZ#797884)

* Squid, used as a transparent proxy, can only handle the HTTP protocol.
Previously, it was possible to define a URL in which the access protocol
contained the asterisk character (*) or an unknown protocol namespace URI.
Consequently, an "Invalid URL" error message was logged to access.log
during reload. This update ensures that "http://" is always used in
transparent proxy URLs, and the error message is no longer logged in this
scenario. (BZ#720504)

All users of squid are advised to upgrade to these updated packages, which
fix these issues. After installing this update, the squid service will be
restarted automatically.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

797571 - squid userid not added to wbpriv group
798090 - client timeout uses server-side "read_timeout", not "request_timeout"
832484 - Squid exits due to signal 6 when IPv6 is disabled and HTTP GET request contains IPv6
address
833086 - squid uses a private md5 hash function for user auth, bypassing FIPS 140-2 restrictions
844723 - The NTLM pass-through authentication doesn't work via squid-3.1.10
847056 - squid incorrectly marks elements as stale when the client uses If-Modified-Since and
If-None-Match headers
887962 - CVE-2012-5643 squid: cachemgr.cgi memory usage DoS and memory leaks

6. Package List:

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/...

i386:
squid-3.1.10-16.el6.i686.rpm
squid-debuginfo-3.1.10-16.el6.i686.rpm

ppc64:
squid-3.1.10-16.el6.ppc64.rpm
squid-debuginfo-3.1.10-16.el6.ppc64.rpm

s390x:
squid-3.1.10-16.el6.s390x.rpm
squid-debuginfo-3.1.10-16.el6.s390x.rpm

x86_64:
squid-3.1.10-16.el6.x86_64.rpm
squid-debuginfo-3.1.10-16.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Worksta...

i386:
squid-3.1.10-16.el6.i686.rpm
squid-debuginfo-3.1.10-16.el6.i686.rpm

x86_64:
squid-3.1.10-16.el6.x86_64.rpm
squid-debuginfo-3.1.10-16.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-5643.html
https://access.redhat.com/security/updates/classification...
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_En...

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=PS5c
-----END PGP SIGNATURE-----