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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
(Red Hat Issues Fix) Squid Resource Record Memory Free Error Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026378
SecurityTracker URL:  http://securitytracker.com/id/1026378
CVE Reference:   CVE-2011-4096   (Links to External Site)
Date:  Dec 7 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.1.16
Description:   A vulnerability was reported in Squid. A remote user can cause denial of service conditions.

A remote user can send a specially crafted DNS request to cause the target service to crash. A request for a domain where a CNAME record points to another CNAME record that points to an empty A record can trigger an invalid memory free error.

Impact:   A remote user can cause the target service to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-1791.html

Vendor URL:  www.squid-cache.org/Advisories/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Nov 1 2011 Squid Resource Record Memory Free Error Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2011:1791-01] Moderate: squid security update

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

Synopsis:          Moderate: squid security update
Advisory ID:       RHSA-2011:1791-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1791.html
Issue date:        2011-12-06
CVE Names:         CVE-2011-4096 
=====================================================================

1. Summary:

An updated squid package that fixes one security issue is 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,
supporting FTP, Gopher, and HTTP data objects. 

An input validation flaw was found in the way Squid calculated the total
number of resource records in the answer section of multiple name server
responses. An attacker could use this flaw to cause Squid to crash. 
(CVE-2011-4096)

Users of squid should upgrade to this updated package, which contains a
backported patch to correct this issue. 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/kb/docs/DOC-11259

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

750316 - CVE-2011-4096 squid: Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record

6. Package List:

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/squid-3.1.10-1.el6_2.1.src.rpm

i386:
squid-3.1.10-1.el6_2.1.i686.rpm
squid-debuginfo-3.1.10-1.el6_2.1.i686.rpm

ppc64:
squid-3.1.10-1.el6_2.1.ppc64.rpm
squid-debuginfo-3.1.10-1.el6_2.1.ppc64.rpm

s390x:
squid-3.1.10-1.el6_2.1.s390x.rpm
squid-debuginfo-3.1.10-1.el6_2.1.s390x.rpm

x86_64:
squid-3.1.10-1.el6_2.1.x86_64.rpm
squid-debuginfo-3.1.10-1.el6_2.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/squid-3.1.10-1.el6_2.1.src.rpm

i386:
squid-3.1.10-1.el6_2.1.i686.rpm
squid-debuginfo-3.1.10-1.el6_2.1.i686.rpm

x86_64:
squid-3.1.10-1.el6_2.1.x86_64.rpm
squid-debuginfo-3.1.10-1.el6_2.1.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-2011-4096.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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