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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
(Red Hat Issues Fix) Squid SSL-Bump Certificate Validation Flaw Lets Remote Servers Bypass Client-side Certificate Validation
SecurityTracker Alert ID:  1034213
SecurityTracker URL:  http://securitytracker.com/id/1034213
CVE Reference:   CVE-2015-3455   (Links to External Site)
Date:  Nov 20 2015
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.2 - 3.2.13, 3.3 - 3.3.13, 3.4 - 3.4.12, 3.5 - 3.5.3
Description:   A vulnerability was reported in Squid. A remote user can bypass security controls on the target system.

The client-first SSL-bump feature does not properly validate X.509 server certificate domain and hostname fields. A remote server can create a specially crafted certificate to bypass client certificate validation.

Only systems configured to perform SSL Bumping with the "client-first" or "bump" mode of operations are affected.

Impact:   A remote server can bypass client certificate validation.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-2378.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-2378.html (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
May 1 2015 Squid SSL-Bump Certificate Validation Flaw Lets Remote Servers Bypass Client-side Certificate Validation



 Source Message Contents

Subject:  [RHSA-2015:2378-01] Moderate: squid security and bug fix update

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

Synopsis:          Moderate: squid security and bug fix update
Advisory ID:       RHSA-2015:2378-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-2378.html
Issue date:        2015-11-19
CVE Names:         CVE-2015-3455 
=====================================================================

1. Summary:

Updated squid packages that fix one security issue and two bugs are now
available for Red Hat Enterprise Linux 7.

Red Hat Product Security 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. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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

It was found that Squid configured with client-first SSL-bump did not
correctly validate X.509 server certificate host name fields. A
man-in-the-middle attacker could use this flaw to spoof a Squid server
using a specially crafted X.509 certificate. (CVE-2015-3455)

This update fixes the following bugs:

* Previously, the squid process did not handle file descriptors correctly
when receiving Simple Network Management Protocol (SNMP) requests. As a
consequence, the process gradually accumulated open file descriptors. This
bug has been fixed and squid now handles SNMP requests correctly, closing
file descriptors when necessary. (BZ#1198778)

* Under high system load, the squid process sometimes terminated
unexpectedly with a segmentation fault during reboot. This update provides
better memory handling during reboot, thus fixing this bug. (BZ#1225640)

Users of squid are advised to upgrade to these updated packages, which fix
these bugs. 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.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1102842 - missing /var/run/squid needed for smp mode
1161600 - Squid does not serve cached responses with Vary headers
1198778 - Filedescriptor leaks on snmp
1204375 - squid sends incorrect ssl chain breaking newer gnutls using applications
1218118 - CVE-2015-3455 squid: incorrect X509 server certificate validation (SQUID-2015:1)
1263338 - squid with digest auth on big endian systems start looping

6. Package List:

Red Hat Enterprise Linux Server (v. 7):

Source:
squid-3.3.8-26.el7.src.rpm

aarch64:
squid-3.3.8-26.el7.aarch64.rpm
squid-debuginfo-3.3.8-26.el7.aarch64.rpm

ppc64:
squid-3.3.8-26.el7.ppc64.rpm
squid-debuginfo-3.3.8-26.el7.ppc64.rpm

ppc64le:
squid-3.3.8-26.el7.ppc64le.rpm
squid-debuginfo-3.3.8-26.el7.ppc64le.rpm

s390x:
squid-3.3.8-26.el7.s390x.rpm
squid-debuginfo-3.3.8-26.el7.s390x.rpm

x86_64:
squid-3.3.8-26.el7.x86_64.rpm
squid-debuginfo-3.3.8-26.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
squid-debuginfo-3.3.8-26.el7.aarch64.rpm
squid-sysvinit-3.3.8-26.el7.aarch64.rpm

ppc64:
squid-debuginfo-3.3.8-26.el7.ppc64.rpm
squid-sysvinit-3.3.8-26.el7.ppc64.rpm

ppc64le:
squid-debuginfo-3.3.8-26.el7.ppc64le.rpm
squid-sysvinit-3.3.8-26.el7.ppc64le.rpm

s390x:
squid-debuginfo-3.3.8-26.el7.s390x.rpm
squid-sysvinit-3.3.8-26.el7.s390x.rpm

x86_64:
squid-debuginfo-3.3.8-26.el7.x86_64.rpm
squid-sysvinit-3.3.8-26.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
squid-3.3.8-26.el7.src.rpm

x86_64:
squid-3.3.8-26.el7.x86_64.rpm
squid-debuginfo-3.3.8-26.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
squid-debuginfo-3.3.8-26.el7.x86_64.rpm
squid-sysvinit-3.3.8-26.el7.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/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3455
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 2015 Red Hat, Inc.
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