Synopsis

Moderate: squid34 security update

Type/Severity

Security Advisory: Moderate

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 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

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

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-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