Skip to navigation Skip to main content

Utilities

  • Subscriptions
  • Downloads
  • Red Hat Console
  • Get Support
Red Hat Customer Portal
  • Subscriptions
  • Downloads
  • Red Hat Console
  • Get Support
  • Products

    Top Products

    • Red Hat Enterprise Linux
    • Red Hat OpenShift
    • Red Hat Ansible Automation Platform
    All Products

    Downloads and Containers

    • Downloads
    • Packages
    • Containers

    Top Resources

    • Documentation
    • Product Life Cycles
    • Product Compliance
    • Errata
  • Knowledge

    Red Hat Knowledge Center

    • Knowledgebase Solutions
    • Knowledgebase Articles
    • Customer Portal Labs
    • Errata

    Top Product Docs

    • Red Hat Enterprise Linux
    • Red Hat OpenShift
    • Red Hat Ansible Automation Platform
    All Product Docs

    Training and Certification

    • About
    • Course Index
    • Certification Index
    • Skill Assessment
  • Security

    Red Hat Product Security Center

    • Security Updates
    • Security Advisories
    • Red Hat CVE Database
    • Errata

    References

    • Security Bulletins
    • Security Measurement
    • Severity Ratings
    • Security Data

    Top Resources

    • Security Labs
    • Backporting Policies
    • Security Blog
  • Support

    Red Hat Support

    • Support Cases
    • Troubleshoot
    • Get Support
    • Contact Red Hat Support

    Red Hat Community Support

    • Customer Portal Community
    • Community Discussions
    • Red Hat Accelerator Program

    Top Resources

    • Product Life Cycles
    • Customer Portal Labs
    • Red Hat JBoss Supported Configurations
    • Red Hat Insights
Or troubleshoot an issue.

Select Your Language

  • English
  • Français
  • 한국어
  • 日本語
  • 中文 (中国)

Infrastructure and Management

  • Red Hat Enterprise Linux
  • Red Hat Satellite
  • Red Hat Subscription Management
  • Red Hat Insights
  • Red Hat Ansible Automation Platform

Cloud Computing

  • Red Hat OpenShift
  • Red Hat OpenStack Platform
  • Red Hat OpenShift
  • Red Hat OpenShift AI
  • Red Hat OpenShift Dedicated
  • Red Hat Advanced Cluster Security for Kubernetes
  • Red Hat Advanced Cluster Management for Kubernetes
  • Red Hat Quay
  • Red Hat OpenShift Dev Spaces
  • Red Hat OpenShift Service on AWS

Storage

  • Red Hat Gluster Storage
  • Red Hat Hyperconverged Infrastructure
  • Red Hat Ceph Storage
  • Red Hat OpenShift Data Foundation

Runtimes

  • Red Hat Runtimes
  • Red Hat JBoss Enterprise Application Platform
  • Red Hat Data Grid
  • Red Hat JBoss Web Server
  • Red Hat build of Keycloak
  • Red Hat support for Spring Boot
  • Red Hat build of Node.js
  • Red Hat build of Quarkus

Integration and Automation

  • Red Hat Application Foundations
  • Red Hat Fuse
  • Red Hat AMQ
  • Red Hat 3scale API Management
All Products
Red Hat Product Errata RHSA-2016:1140 - Security Advisory
Issued:
2016-05-31
Updated:
2016-05-31

RHSA-2016:1140 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Moderate: squid34 security update

Type/Severity

Security Advisory: Moderate

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

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.

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. Note that apart from "squid34", this version of Red Hat Enterprise Linux also includes the "squid" packages which provide Squid version 3.1.

Security Fix(es):

  • A buffer overflow flaw was found in the way the Squid cachemgr.cgi utility processed remotely relayed Squid input. When the CGI interface utility is used, a remote attacker could possibly use this flaw to execute arbitrary code. (CVE-2016-4051)
  • Buffer overflow and input validation flaws were found in the way Squid processed ESI responses. If Squid was used as a reverse proxy, or for TLS/HTTPS interception, a remote attacker able to control ESI components on an HTTP server could use these flaws to crash Squid, disclose parts of the stack memory, or possibly execute arbitrary code as the user running Squid. (CVE-2016-4052, CVE-2016-4053, CVE-2016-4054)
  • An input validation flaw was found in the way Squid handled intercepted HTTP Request messages. An attacker could use this flaw to bypass the protection against issues related to CVE-2009-0801, and perform cache poisoning attacks on Squid. (CVE-2016-4553)
  • An input validation flaw was found in Squid's mime_get_header_field() function, which is used to search for headers within HTTP requests. An attacker could send an HTTP request from the client side with specially crafted header Host header that bypasses same-origin security protections, causing Squid operating as interception or reverse-proxy to contact the wrong origin server. It could also be used for cache poisoning for client not following RFC 7230. (CVE-2016-4554)
  • A NULL pointer dereference flaw was found in the way Squid processes ESI responses. If Squid was used as a reverse proxy or for TLS/HTTPS interception, a malicious server could use this flaw to crash the Squid worker process. (CVE-2016-4555)
  • An incorrect reference counting flaw was found in the way Squid processes ESI responses. If Squid is configured as reverse-proxy, for TLS/HTTPS interception, an attacker controlling a server accessed by Squid, could crash the squid worker, causing a Denial of Service attack. (CVE-2016-4556)

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.

Affected Products

  • Red Hat Enterprise Linux Server 6 x86_64
  • Red Hat Enterprise Linux Server 6 i386
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
  • Red Hat Enterprise Linux Workstation 6 x86_64
  • Red Hat Enterprise Linux Workstation 6 i386
  • Red Hat Enterprise Linux for IBM z Systems 6 s390x
  • Red Hat Enterprise Linux for Power, big endian 6 ppc64
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

  • BZ - 1329126 - CVE-2016-4051 squid: buffer overflow in cachemgr.cgi
  • BZ - 1329136 - CVE-2016-4052 CVE-2016-4053 CVE-2016-4054 squid: multiple issues in ESI processing
  • BZ - 1334233 - CVE-2016-4553 squid: Cache poisoning issue in HTTP Request handling
  • BZ - 1334241 - CVE-2016-4554 squid: Header Smuggling issue in HTTP Request processing
  • BZ - 1334246 - CVE-2016-4555 squid: SegFault from ESIInclude::Start
  • BZ - 1334786 - CVE-2016-4556 squid: SIGSEGV in ESIContext response handling

CVEs

  • CVE-2016-4051
  • CVE-2016-4052
  • CVE-2016-4053
  • CVE-2016-4054
  • CVE-2016-4553
  • CVE-2016-4554
  • CVE-2016-4555
  • CVE-2016-4556

References

  • http://www.redhat.com/security/updates/classification/#normal
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
x86_64
squid34-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 831425fbbf157658b9efa9cb0b00912f3a279737d8b506a8c2c5209475789443
squid34-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 831425fbbf157658b9efa9cb0b00912f3a279737d8b506a8c2c5209475789443
squid34-debuginfo-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 87681ebef61c22aad0ef062b3bd7ef473c6b1f981b13e5afa0fd65a6aca17cb1
squid34-debuginfo-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 87681ebef61c22aad0ef062b3bd7ef473c6b1f981b13e5afa0fd65a6aca17cb1
i386
squid34-3.4.14-9.el6_8.3.i686.rpm SHA-256: d5f686b99d7ac72a2e8f11b6561c4dd1cfd9a4cb42af13233d1968f63f2f5cad
squid34-debuginfo-3.4.14-9.el6_8.3.i686.rpm SHA-256: cd4be61ba19744e03004fa1ea20399054c0841fc4df4ccf3428697f278607fb0

Red Hat Enterprise Linux Server - Extended Life Cycle Support 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
x86_64
squid34-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 831425fbbf157658b9efa9cb0b00912f3a279737d8b506a8c2c5209475789443
squid34-debuginfo-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 87681ebef61c22aad0ef062b3bd7ef473c6b1f981b13e5afa0fd65a6aca17cb1
i386
squid34-3.4.14-9.el6_8.3.i686.rpm SHA-256: d5f686b99d7ac72a2e8f11b6561c4dd1cfd9a4cb42af13233d1968f63f2f5cad
squid34-debuginfo-3.4.14-9.el6_8.3.i686.rpm SHA-256: cd4be61ba19744e03004fa1ea20399054c0841fc4df4ccf3428697f278607fb0

Red Hat Enterprise Linux Workstation 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
x86_64
squid34-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 831425fbbf157658b9efa9cb0b00912f3a279737d8b506a8c2c5209475789443
squid34-debuginfo-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 87681ebef61c22aad0ef062b3bd7ef473c6b1f981b13e5afa0fd65a6aca17cb1
i386
squid34-3.4.14-9.el6_8.3.i686.rpm SHA-256: d5f686b99d7ac72a2e8f11b6561c4dd1cfd9a4cb42af13233d1968f63f2f5cad
squid34-debuginfo-3.4.14-9.el6_8.3.i686.rpm SHA-256: cd4be61ba19744e03004fa1ea20399054c0841fc4df4ccf3428697f278607fb0

Red Hat Enterprise Linux for IBM z Systems 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
s390x
squid34-3.4.14-9.el6_8.3.s390x.rpm SHA-256: d4656e2f10490af66b2ccecf5dc0e157b754c81ce4b49e12584a662e66ffc9dd
squid34-debuginfo-3.4.14-9.el6_8.3.s390x.rpm SHA-256: f793a0adbde385fec5a6457b2fb502c076320416e279b1d4d443e2dbbcad5d54

Red Hat Enterprise Linux for Power, big endian 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
ppc64
squid34-3.4.14-9.el6_8.3.ppc64.rpm SHA-256: b77735c9d1ffd4d8a48f104fbfdb227e7364293f2aa48d0b4abcf559ffe6d7ce
squid34-debuginfo-3.4.14-9.el6_8.3.ppc64.rpm SHA-256: b3e87cfe6b82abdad549053c107d565404a6b3f6dea9d56e86269d4cd2c3ccb1

Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
s390x
squid34-3.4.14-9.el6_8.3.s390x.rpm SHA-256: d4656e2f10490af66b2ccecf5dc0e157b754c81ce4b49e12584a662e66ffc9dd
squid34-debuginfo-3.4.14-9.el6_8.3.s390x.rpm SHA-256: f793a0adbde385fec5a6457b2fb502c076320416e279b1d4d443e2dbbcad5d54

Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
x86_64
squid34-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 831425fbbf157658b9efa9cb0b00912f3a279737d8b506a8c2c5209475789443
squid34-debuginfo-3.4.14-9.el6_8.3.x86_64.rpm SHA-256: 87681ebef61c22aad0ef062b3bd7ef473c6b1f981b13e5afa0fd65a6aca17cb1
i386
squid34-3.4.14-9.el6_8.3.i686.rpm SHA-256: d5f686b99d7ac72a2e8f11b6561c4dd1cfd9a4cb42af13233d1968f63f2f5cad
squid34-debuginfo-3.4.14-9.el6_8.3.i686.rpm SHA-256: cd4be61ba19744e03004fa1ea20399054c0841fc4df4ccf3428697f278607fb0

Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6

SRPM
squid34-3.4.14-9.el6_8.3.src.rpm SHA-256: 9c88c11c58acfff007cd744da06fa8ab1bd0c2a250541ad6ecd6884e43546cc8
s390x
squid34-3.4.14-9.el6_8.3.s390x.rpm SHA-256: d4656e2f10490af66b2ccecf5dc0e157b754c81ce4b49e12584a662e66ffc9dd
squid34-debuginfo-3.4.14-9.el6_8.3.s390x.rpm SHA-256: f793a0adbde385fec5a6457b2fb502c076320416e279b1d4d443e2dbbcad5d54

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

Red Hat LinkedIn YouTube Facebook X, formerly Twitter

Quick Links

  • Downloads
  • Subscriptions
  • Support Cases
  • Customer Service
  • Product Documentation

Help

  • Contact Us
  • Customer Portal FAQ
  • Log-in Assistance

Site Info

  • Trust Red Hat
  • Browser Support Policy
  • Accessibility
  • Awards and Recognition
  • Colophon

Related Sites

  • redhat.com
  • developers.redhat.com
  • connect.redhat.com
  • cloud.redhat.com

Red Hat legal and privacy links

  • About Red Hat
  • Jobs
  • Events
  • Locations
  • Contact Red Hat
  • Red Hat Blog
  • Inclusion at Red Hat
  • Cool Stuff Store
  • Red Hat Summit
© 2025 Red Hat, Inc.

Red Hat legal and privacy links

  • Privacy statement
  • Terms of use
  • All policies and guidelines
  • Digital accessibility