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Security Advisory Moderate: squid security and bug fix update

Advisory: RHSA-2013:0505-2
Type: Security Advisory
Severity: Moderate
Issued on: 2013-02-21
Last updated on: 2013-02-21
Affected Products: Red Hat Enterprise Linux Server (v. 6)
Red Hat Enterprise Linux Workstation (v. 6)
CVEs (cve.mitre.org): CVE-2012-5643

Details

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.

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.


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

Updated packages

Red Hat Enterprise Linux Server (v. 6)

SRPMS:
squid-3.1.10-16.el6.src.rpm
File outdated by:  RHBA-2014:0048
    MD5: c8ea20b7847eb43ada6b1ee52f4c7c77
SHA-256: 2bb5f9f0c43fcb00bc9e2c8b9258f27d60450ce878f11d4e9af2f23f92289a57
 
IA-32:
squid-3.1.10-16.el6.i686.rpm
File outdated by:  RHBA-2014:0048
    MD5: d40f270e5d7088f4623594a55eb2c317
SHA-256: 9c1b0ddb14216dff7c37fed6083c30b006fdcf38908c49ea478d7df5ca5dd3e6
squid-debuginfo-3.1.10-16.el6.i686.rpm
File outdated by:  RHBA-2014:0048
    MD5: 851c445de356d70a135fc9709a65fd5f
SHA-256: 61397e8111ee83cc3376779433e3e10cd2dbbba4c538c978dd61c89db40cdea7
 
PPC:
squid-3.1.10-16.el6.ppc64.rpm
File outdated by:  RHBA-2014:0048
    MD5: e0bc61ae8f0326d926f58ccbe3e80eac
SHA-256: f8cad3d96b87afd50a9054606af0544bbb5707acb961bd94fc2e3496fed603cc
squid-debuginfo-3.1.10-16.el6.ppc64.rpm
File outdated by:  RHBA-2014:0048
    MD5: fbe828aea50d6811bcb7a0e060ce4527
SHA-256: 789b85bc21c4f2854a4ee898d7ca348e4c4743fdd0c92172bce59f1cbc588df0
 
s390x:
squid-3.1.10-16.el6.s390x.rpm
File outdated by:  RHBA-2014:0048
    MD5: 26933cc91faa1e96d733453b223f3ccc
SHA-256: 98f065a9e85a5db211659a1d2713bda6ca416a23bddddf0d265958f05a4e4438
squid-debuginfo-3.1.10-16.el6.s390x.rpm
File outdated by:  RHBA-2014:0048
    MD5: 64f3822ac3c300a34742813f27e000bc
SHA-256: 7ebed860ecb588c4c7b9b5318b1b98816eb10b7d61bb27f325b276174598ef66
 
x86_64:
squid-3.1.10-16.el6.x86_64.rpm
File outdated by:  RHBA-2014:0048
    MD5: 3a4d038cadcbf4fb2a07f35b83619c70
SHA-256: 1bfdaf2b1c0f0c974e8bf7dcb788cb2fc2dd1e392b3dd53d7df45c00e4c82f85
squid-debuginfo-3.1.10-16.el6.x86_64.rpm
File outdated by:  RHBA-2014:0048
    MD5: 5437e4d300211bb8586a92ce2ec0e1db
SHA-256: 3e0ad74f994ee1090c9725e5474d218abbd48da3af82dec0ec23b38796f239c5
 
Red Hat Enterprise Linux Workstation (v. 6)

SRPMS:
squid-3.1.10-16.el6.src.rpm
File outdated by:  RHBA-2014:0048
    MD5: c8ea20b7847eb43ada6b1ee52f4c7c77
SHA-256: 2bb5f9f0c43fcb00bc9e2c8b9258f27d60450ce878f11d4e9af2f23f92289a57
 
IA-32:
squid-3.1.10-16.el6.i686.rpm
File outdated by:  RHBA-2014:0048
    MD5: d40f270e5d7088f4623594a55eb2c317
SHA-256: 9c1b0ddb14216dff7c37fed6083c30b006fdcf38908c49ea478d7df5ca5dd3e6
squid-debuginfo-3.1.10-16.el6.i686.rpm
File outdated by:  RHBA-2014:0048
    MD5: 851c445de356d70a135fc9709a65fd5f
SHA-256: 61397e8111ee83cc3376779433e3e10cd2dbbba4c538c978dd61c89db40cdea7
 
x86_64:
squid-3.1.10-16.el6.x86_64.rpm
File outdated by:  RHBA-2014:0048
    MD5: 3a4d038cadcbf4fb2a07f35b83619c70
SHA-256: 1bfdaf2b1c0f0c974e8bf7dcb788cb2fc2dd1e392b3dd53d7df45c00e4c82f85
squid-debuginfo-3.1.10-16.el6.x86_64.rpm
File outdated by:  RHBA-2014:0048
    MD5: 5437e4d300211bb8586a92ce2ec0e1db
SHA-256: 3e0ad74f994ee1090c9725e5474d218abbd48da3af82dec0ec23b38796f239c5
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

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


References



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

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/