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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
(Red Hat Issues Fix) Squid Conditional Request Handling Flaw Lets Remote Users Obtain Potentially Sensitive Information on the Target System
SecurityTracker Alert ID:  1037685
SecurityTracker URL:  http://securitytracker.com/id/1037685
CVE Reference:   CVE-2016-10002   (Links to External Site)
Date:  Jan 24 2017
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.1 - 3.5.22, 4.0 - 4.0.16
Description:   A vulnerability was reported in Squid. A remote user can obtain potentially sensitive information on the target system.

A remote user can send a specially crafted request to trigger a flaw in the processing of conditional requests and cause the target system to return responses containing potentially sensitive information about another client's browsing session. This information may include authentication credentials.

Saulius Lapinskas from Lithuanian State Social Insurance Fund Board reported this vulnerability.

Impact:   A remote user can obtain potentially sensitive information about other user sessions on the target system.
Solution:   Red Hat has issued a fix for squid34.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0183.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0183.html (Links to External Site)
Cause:   Access control 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.
Dec 21 2016 Squid Conditional Request Handling Flaw Lets Remote Users Obtain Potentially Sensitive Information on the Target System



 Source Message Contents

Subject:  [RHSA-2017:0183-01] Moderate: squid34 security update

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

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

Synopsis:          Moderate: squid34 security update
Advisory ID:       RHSA-2017:0183-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0183.html
Issue date:        2017-01-24
CVE Names:         CVE-2016-10002 
=====================================================================

1. Summary:

An update for squid34 is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) 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:

The squid34 packages provide version 3.4 of Squid, a high-performance proxy
caching server for web clients, supporting FTP, Gopher, and HTTP data
objects.

Security Fix(es):

* It was found that squid did not properly remove connection specific
headers when answering conditional requests using a cached request. A
remote attacker could send a specially crafted request to an HTTP server
via the squid proxy and steal private data from other connections.
(CVE-2016-10002)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

After installing this update, the squid service will be restarted
automatically.

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

1405941 - CVE-2016-10002 squid: Information disclosure in HTTP request processing

6. Package List:

Red Hat Enterprise Linux Server (v. 6):

Source:
squid34-3.4.14-9.el6_8.4.src.rpm

i386:
squid34-3.4.14-9.el6_8.4.i686.rpm
squid34-debuginfo-3.4.14-9.el6_8.4.i686.rpm

ppc64:
squid34-3.4.14-9.el6_8.4.ppc64.rpm
squid34-debuginfo-3.4.14-9.el6_8.4.ppc64.rpm

s390x:
squid34-3.4.14-9.el6_8.4.s390x.rpm
squid34-debuginfo-3.4.14-9.el6_8.4.s390x.rpm

x86_64:
squid34-3.4.14-9.el6_8.4.x86_64.rpm
squid34-debuginfo-3.4.14-9.el6_8.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
squid34-3.4.14-9.el6_8.4.src.rpm

i386:
squid34-3.4.14-9.el6_8.4.i686.rpm
squid34-debuginfo-3.4.14-9.el6_8.4.i686.rpm

x86_64:
squid34-3.4.14-9.el6_8.4.x86_64.rpm
squid34-debuginfo-3.4.14-9.el6_8.4.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-2016-10002
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 2017 Red Hat, Inc.
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