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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
(Red Hat Issues Fix) Squid HTTP Response Processing Bugs Let Remote Users Deny Service to Proxy Client Users
SecurityTracker Alert ID:  1037214
SecurityTracker URL:  http://securitytracker.com/id/1037214
CVE Reference:   CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-2572   (Links to External Site)
Date:  Nov 4 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 3.x, 4.x
Description:   Some vulnerabilities were reported in Squid. A remote user can cause denial of service conditions on the target client systems.

A remote server can return a specially crafted HTTP response to trigger an overflow in the proxy, causing all connected client users to be disconnected.

Mathias Fischer from Open Systems AG reported this vulnerability.

A remote server can return a specially crafted HTTP response to trigger an error handling flaw in the proxy, causing all connected client users to be disconnected.

Alex Rousskov from The Measurement Factory reported this vulnerability.

These vulnerabilities are being actively exploited.

Impact:   A remote user can cause the target connected client users to be disconnected.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-2600.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2600.html (Links to External Site)
Cause:   Boundary error, Exception handling 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.
Feb 24 2016 Squid HTTP Response Processing Bugs Let Remote Users Deny Service to Proxy Client Users



 Source Message Contents

Subject:  [RHSA-2016:2600-02] Moderate: squid security, bug fix, and enhancement update

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

Synopsis:          Moderate: squid security, bug fix, and enhancement update
Advisory ID:       RHSA-2016:2600-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2600.html
Issue date:        2016-11-03
CVE Names:         CVE-2016-2569 CVE-2016-2570 CVE-2016-2571 
                   CVE-2016-2572 CVE-2016-3948 
=====================================================================

1. Summary:

An update for squid is now available for Red Hat Enterprise Linux 7.

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. 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.

The following packages have been upgraded to a newer upstream version:
squid (3.5.20). (BZ#1273942, BZ#1349775)

Security Fix(es):

* Incorrect boundary checks were found in the way squid handled headers in
HTTP responses, which could lead to an assertion failure. A malicious HTTP
server could use this flaw to crash squid using a specially crafted HTTP
response. (CVE-2016-2569, CVE-2016-2570)

* It was found that squid did not properly handle errors when failing to
parse an HTTP response, possibly leading to an assertion failure. A
malicious HTTP server could use this flaw to crash squid using a specially
crafted HTTP response. (CVE-2016-2571, CVE-2016-2572)

* An incorrect boundary check was found in the way squid handled the Vary
header in HTTP responses, which could lead to an assertion failure. A
malicious HTTP server could use this flaw to crash squid using a specially
crafted HTTP response. (CVE-2016-3948)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.3 Release Notes linked from the References section.

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/):

1254016 - IPv4 fallback is not working when connecting to a dualstack host with non-functional IPv6
1254018 - should BuildRequire: g++
1299972 - squid file descriptor limit hardcoded to 16384 via compile option in spec file
1312257 - CVE-2016-2569 CVE-2016-2570 squid: some code paths fail to check bounds in string object
1312262 - CVE-2016-2571 CVE-2016-2572 squid: wrong error handling for malformed HTTP responses
1323594 - CVE-2016-3948 squid: denial of service issue in HTTP response processing
1330186 - digest doesn't properly work with squid 3.3 on CentOS 7
1336940 - Disable squid systemd unit start/stop timeouts

6. Package List:

Red Hat Enterprise Linux Server (v. 7):

Source:
squid-3.5.20-2.el7.src.rpm

aarch64:
squid-3.5.20-2.el7.aarch64.rpm
squid-debuginfo-3.5.20-2.el7.aarch64.rpm
squid-migration-script-3.5.20-2.el7.aarch64.rpm

ppc64:
squid-3.5.20-2.el7.ppc64.rpm
squid-debuginfo-3.5.20-2.el7.ppc64.rpm
squid-migration-script-3.5.20-2.el7.ppc64.rpm

ppc64le:
squid-3.5.20-2.el7.ppc64le.rpm
squid-debuginfo-3.5.20-2.el7.ppc64le.rpm
squid-migration-script-3.5.20-2.el7.ppc64le.rpm

s390x:
squid-3.5.20-2.el7.s390x.rpm
squid-debuginfo-3.5.20-2.el7.s390x.rpm
squid-migration-script-3.5.20-2.el7.s390x.rpm

x86_64:
squid-3.5.20-2.el7.x86_64.rpm
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-migration-script-3.5.20-2.el7.x86_64.rpm

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

aarch64:
squid-debuginfo-3.5.20-2.el7.aarch64.rpm
squid-sysvinit-3.5.20-2.el7.aarch64.rpm

ppc64:
squid-debuginfo-3.5.20-2.el7.ppc64.rpm
squid-sysvinit-3.5.20-2.el7.ppc64.rpm

ppc64le:
squid-debuginfo-3.5.20-2.el7.ppc64le.rpm
squid-sysvinit-3.5.20-2.el7.ppc64le.rpm

s390x:
squid-debuginfo-3.5.20-2.el7.s390x.rpm
squid-sysvinit-3.5.20-2.el7.s390x.rpm

x86_64:
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-sysvinit-3.5.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
squid-3.5.20-2.el7.src.rpm

x86_64:
squid-3.5.20-2.el7.x86_64.rpm
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-migration-script-3.5.20-2.el7.x86_64.rpm

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

x86_64:
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-sysvinit-3.5.20-2.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-2016-2569
https://access.redhat.com/security/cve/CVE-2016-2570
https://access.redhat.com/security/cve/CVE-2016-2571
https://access.redhat.com/security/cve/CVE-2016-2572
https://access.redhat.com/security/cve/CVE-2016-3948
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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