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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
(Red Hat Issues Fix) Squid Gopher Response Memory Corruption Error Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026049
SecurityTracker URL:  http://securitytracker.com/id/1026049
CVE Reference:   CVE-2011-3205   (Links to External Site)
Date:  Sep 14 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 3.0.x prior to 3.0.STABLE26, 3.1.x prior to 3.1.15, 3.2.x prior to 3.2.0.11
Description:   A vulnerability was reported in Squid. A remote user can cause denial of service conditions.

A remote Gopher server can return a specially crafted response longer than 4096 bytes to trigger a memory corruption error and cause the target Squid service to crash.

Ben Hawkes, Google Security Team, reported this vulnerability.

Impact:   A remote user can cause Squid to restart.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-1293.html

Vendor URL:  www.squid-cache.org/Advisories/SQUID-2011_3.txt (Links to External Site)
Cause:   Boundary 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.
Aug 29 2011 Squid Gopher Response Memory Corruption Error Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2011:1293-01] Moderate: squid security update

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

Synopsis:          Moderate: squid security update
Advisory ID:       RHSA-2011:1293-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1293.html
Issue date:        2011-09-14
CVE Names:         CVE-2011-3205 
=====================================================================

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.

A buffer overflow flaw was found in the way Squid parsed replies from
remote Gopher servers. A remote user allowed to send Gopher requests to a
Squid proxy could possibly use this flaw to cause the squid child process
to crash or execute arbitrary code with the privileges of the squid user,
by making Squid perform a request to an attacker-controlled Gopher server.
(CVE-2011-3205)

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/):

734583 - CVE-2011-3205 squid: buffer overflow flaw in Squid's Gopher reply parser (SQUID-2011:3)

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_1.1.src.rpm

i386:
squid-3.1.10-1.el6_1.1.i686.rpm
squid-debuginfo-3.1.10-1.el6_1.1.i686.rpm

ppc64:
squid-3.1.10-1.el6_1.1.ppc64.rpm
squid-debuginfo-3.1.10-1.el6_1.1.ppc64.rpm

s390x:
squid-3.1.10-1.el6_1.1.s390x.rpm
squid-debuginfo-3.1.10-1.el6_1.1.s390x.rpm

x86_64:
squid-3.1.10-1.el6_1.1.x86_64.rpm
squid-debuginfo-3.1.10-1.el6_1.1.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_1.1.src.rpm

i386:
squid-3.1.10-1.el6_1.1.i686.rpm
squid-debuginfo-3.1.10-1.el6_1.1.i686.rpm

x86_64:
squid-3.1.10-1.el6_1.1.x86_64.rpm
squid-debuginfo-3.1.10-1.el6_1.1.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-2011-3205.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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