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Red Hat Security Advisory 2016-1421-01

Red Hat Security Advisory 2016-1421-01
Posted Jul 18, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-1421-01 - The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server. Security Fix: It was discovered that httpd used the value of the Proxy header from HTTP requests to initialize the HTTP_PROXY environment variable for CGI scripts, which in turn was incorrectly used by certain HTTP client implementations to configure the proxy for outgoing HTTP requests. A remote attacker could possibly use this flaw to redirect HTTP requests performed by a CGI script to an attacker-controlled proxy via a malicious HTTP request.

tags | advisory, remote, web, cgi
systems | linux, redhat
advisories | CVE-2016-5387
SHA-256 | 436fc4e839cc2887a759542674a0dc2989aec34c7b74fe6ed4b9921e48d2096d

Red Hat Security Advisory 2016-1421-01

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

Synopsis: Important: httpd security update
Advisory ID: RHSA-2016:1421-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1421
Issue date: 2016-07-18
CVE Names: CVE-2016-5387
=====================================================================

1. Summary:

An update for httpd is now available for Red Hat Enterprise Linux 5 and Red
Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64

3. Description:

The httpd packages provide the Apache HTTP Server, a powerful, efficient,
and extensible web server.

Security Fix(es):

* It was discovered that httpd used the value of the Proxy header from HTTP
requests to initialize the HTTP_PROXY environment variable for CGI scripts,
which in turn was incorrectly used by certain HTTP client implementations
to configure the proxy for outgoing HTTP requests. A remote attacker could
possibly use this flaw to redirect HTTP requests performed by a CGI script
to an attacker-controlled proxy via a malicious HTTP request.
(CVE-2016-5387)

Note: After this update, httpd will no longer pass the value of the Proxy
request header to scripts via the HTTP_PROXY environment variable.

Red Hat would like to thank Scott Geary (VendHQ) for reporting this issue.

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 the updated packages, the httpd daemon will be restarted
automatically.

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

1353755 - CVE-2016-5387 Apache HTTPD: sets environmental variable based on user supplied Proxy request header

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
httpd-2.2.3-92.el5_11.src.rpm

i386:
httpd-2.2.3-92.el5_11.i386.rpm
httpd-debuginfo-2.2.3-92.el5_11.i386.rpm
mod_ssl-2.2.3-92.el5_11.i386.rpm

x86_64:
httpd-2.2.3-92.el5_11.x86_64.rpm
httpd-debuginfo-2.2.3-92.el5_11.x86_64.rpm
mod_ssl-2.2.3-92.el5_11.x86_64.rpm

Red Hat Enterprise Linux Desktop Workstation (v. 5 client):

Source:
httpd-2.2.3-92.el5_11.src.rpm

i386:
httpd-debuginfo-2.2.3-92.el5_11.i386.rpm
httpd-devel-2.2.3-92.el5_11.i386.rpm
httpd-manual-2.2.3-92.el5_11.i386.rpm

x86_64:
httpd-debuginfo-2.2.3-92.el5_11.i386.rpm
httpd-debuginfo-2.2.3-92.el5_11.x86_64.rpm
httpd-devel-2.2.3-92.el5_11.i386.rpm
httpd-devel-2.2.3-92.el5_11.x86_64.rpm
httpd-manual-2.2.3-92.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
httpd-2.2.3-92.el5_11.src.rpm

i386:
httpd-2.2.3-92.el5_11.i386.rpm
httpd-debuginfo-2.2.3-92.el5_11.i386.rpm
httpd-devel-2.2.3-92.el5_11.i386.rpm
httpd-manual-2.2.3-92.el5_11.i386.rpm
mod_ssl-2.2.3-92.el5_11.i386.rpm

ia64:
httpd-2.2.3-92.el5_11.ia64.rpm
httpd-debuginfo-2.2.3-92.el5_11.ia64.rpm
httpd-devel-2.2.3-92.el5_11.ia64.rpm
httpd-manual-2.2.3-92.el5_11.ia64.rpm
mod_ssl-2.2.3-92.el5_11.ia64.rpm

ppc:
httpd-2.2.3-92.el5_11.ppc.rpm
httpd-debuginfo-2.2.3-92.el5_11.ppc.rpm
httpd-debuginfo-2.2.3-92.el5_11.ppc64.rpm
httpd-devel-2.2.3-92.el5_11.ppc.rpm
httpd-devel-2.2.3-92.el5_11.ppc64.rpm
httpd-manual-2.2.3-92.el5_11.ppc.rpm
mod_ssl-2.2.3-92.el5_11.ppc.rpm

s390x:
httpd-2.2.3-92.el5_11.s390x.rpm
httpd-debuginfo-2.2.3-92.el5_11.s390.rpm
httpd-debuginfo-2.2.3-92.el5_11.s390x.rpm
httpd-devel-2.2.3-92.el5_11.s390.rpm
httpd-devel-2.2.3-92.el5_11.s390x.rpm
httpd-manual-2.2.3-92.el5_11.s390x.rpm
mod_ssl-2.2.3-92.el5_11.s390x.rpm

x86_64:
httpd-2.2.3-92.el5_11.x86_64.rpm
httpd-debuginfo-2.2.3-92.el5_11.i386.rpm
httpd-debuginfo-2.2.3-92.el5_11.x86_64.rpm
httpd-devel-2.2.3-92.el5_11.i386.rpm
httpd-devel-2.2.3-92.el5_11.x86_64.rpm
httpd-manual-2.2.3-92.el5_11.x86_64.rpm
mod_ssl-2.2.3-92.el5_11.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
httpd-2.2.15-54.el6_8.src.rpm

i386:
httpd-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-tools-2.2.15-54.el6_8.i686.rpm

x86_64:
httpd-2.2.15-54.el6_8.x86_64.rpm
httpd-debuginfo-2.2.15-54.el6_8.x86_64.rpm
httpd-tools-2.2.15-54.el6_8.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
mod_ssl-2.2.15-54.el6_8.i686.rpm

noarch:
httpd-manual-2.2.15-54.el6_8.noarch.rpm

x86_64:
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.x86_64.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.x86_64.rpm
mod_ssl-2.2.15-54.el6_8.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
httpd-2.2.15-54.el6_8.src.rpm

x86_64:
httpd-2.2.15-54.el6_8.x86_64.rpm
httpd-debuginfo-2.2.15-54.el6_8.x86_64.rpm
httpd-tools-2.2.15-54.el6_8.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

noarch:
httpd-manual-2.2.15-54.el6_8.noarch.rpm

x86_64:
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.x86_64.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.x86_64.rpm
mod_ssl-2.2.15-54.el6_8.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
httpd-2.2.15-54.el6_8.src.rpm

i386:
httpd-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
httpd-tools-2.2.15-54.el6_8.i686.rpm
mod_ssl-2.2.15-54.el6_8.i686.rpm

noarch:
httpd-manual-2.2.15-54.el6_8.noarch.rpm

ppc64:
httpd-2.2.15-54.el6_8.ppc64.rpm
httpd-debuginfo-2.2.15-54.el6_8.ppc.rpm
httpd-debuginfo-2.2.15-54.el6_8.ppc64.rpm
httpd-devel-2.2.15-54.el6_8.ppc.rpm
httpd-devel-2.2.15-54.el6_8.ppc64.rpm
httpd-tools-2.2.15-54.el6_8.ppc64.rpm
mod_ssl-2.2.15-54.el6_8.ppc64.rpm

s390x:
httpd-2.2.15-54.el6_8.s390x.rpm
httpd-debuginfo-2.2.15-54.el6_8.s390.rpm
httpd-debuginfo-2.2.15-54.el6_8.s390x.rpm
httpd-devel-2.2.15-54.el6_8.s390.rpm
httpd-devel-2.2.15-54.el6_8.s390x.rpm
httpd-tools-2.2.15-54.el6_8.s390x.rpm
mod_ssl-2.2.15-54.el6_8.s390x.rpm

x86_64:
httpd-2.2.15-54.el6_8.x86_64.rpm
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.x86_64.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.x86_64.rpm
httpd-tools-2.2.15-54.el6_8.x86_64.rpm
mod_ssl-2.2.15-54.el6_8.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
httpd-2.2.15-54.el6_8.src.rpm

i386:
httpd-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
httpd-tools-2.2.15-54.el6_8.i686.rpm
mod_ssl-2.2.15-54.el6_8.i686.rpm

noarch:
httpd-manual-2.2.15-54.el6_8.noarch.rpm

x86_64:
httpd-2.2.15-54.el6_8.x86_64.rpm
httpd-debuginfo-2.2.15-54.el6_8.i686.rpm
httpd-debuginfo-2.2.15-54.el6_8.x86_64.rpm
httpd-devel-2.2.15-54.el6_8.i686.rpm
httpd-devel-2.2.15-54.el6_8.x86_64.rpm
httpd-tools-2.2.15-54.el6_8.x86_64.rpm
mod_ssl-2.2.15-54.el6_8.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-2016-5387
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/httpoxy
https://access.redhat.com/solutions/2435501

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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