news 28 Posted May 31, 2016 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: squid security update Advisory ID: RHSA-2016:1138-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2016:1138 Issue date: 2016-05-31 CVE Names: CVE-2016-4051 CVE-2016-4052 CVE-2016-4053 CVE-2016-4054 CVE-2016-4554 CVE-2016-4556 ===================================================================== 1. Summary: An update for squid 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: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. 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 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) * 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) 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/): 1329126 - CVE-2016-4051 squid: buffer overflow in cachemgr.cgi 1329136 - CVE-2016-4052 CVE-2016-4053 CVE-2016-4054 squid: multiple issues in ESI processing 1334241 - CVE-2016-4554 squid: Header Smuggling issue in HTTP Request processing 1334786 - CVE-2016-4556 squid: SIGSEGV in ESIContext response handling 6. Package List: Red Hat Enterprise Linux Server (v. 6): Source: squid-3.1.23-16.el6_8.4.src.rpm i386: squid-3.1.23-16.el6_8.4.i686.rpm squid-debuginfo-3.1.23-16.el6_8.4.i686.rpm ppc64: squid-3.1.23-16.el6_8.4.ppc64.rpm squid-debuginfo-3.1.23-16.el6_8.4.ppc64.rpm s390x: squid-3.1.23-16.el6_8.4.s390x.rpm squid-debuginfo-3.1.23-16.el6_8.4.s390x.rpm x86_64: squid-3.1.23-16.el6_8.4.x86_64.rpm squid-debuginfo-3.1.23-16.el6_8.4.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: squid-3.1.23-16.el6_8.4.src.rpm i386: squid-3.1.23-16.el6_8.4.i686.rpm squid-debuginfo-3.1.23-16.el6_8.4.i686.rpm x86_64: squid-3.1.23-16.el6_8.4.x86_64.rpm squid-debuginfo-3.1.23-16.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-2016-4051 https://access.redhat.com/security/cve/CVE-2016-4052 https://access.redhat.com/security/cve/CVE-2016-4053 https://access.redhat.com/security/cve/CVE-2016-4054 https://access.redhat.com/security/cve/CVE-2016-4554 https://access.redhat.com/security/cve/CVE-2016-4556 https://access.redhat.com/security/updates/classification/#moderate http://www.squid-cache.org/Advisories/SQUID-2016_5.txt http://www.squid-cache.org/Advisories/SQUID-2016_6.txt http://www.squid-cache.org/Advisories/SQUID-2016_8.txt http://www.squid-cache.org/Advisories/SQUID-2016_9.txt 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFXTS1iXlSAg2UNWIIRAtfwAJ4j1CVztfjtzlLcAXcfC2q+CTovwgCcDEnM AkjRLWOPUFQ8GtHRIhjkp/Q= =Bdvj -----END PGP SIGNATURE----- -- Share this post Link to post
