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

Synopsis:          Important: httpd security and bug fix update
Advisory ID:       RHSA-2016:1422-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2016:1422
Issue date:        2016-07-18
CVE Names:         CVE-2016-5387 
=====================================================================

1. Summary:

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

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 Client Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - 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.

Bug Fix(es):

* In a caching proxy configuration, the mod_cache module would treat
content as stale if the Expires header changed when refreshing a cached
response. As a consequence, an origin server returning content without a
fixed Expires header would not be treated as cacheable. The mod_cache
module has been fixed to ignore changes in the Expires header when
refreshing content. As a result, such content is now cacheable, improving
performance and reducing load at the origin server. (BZ#1347648)

* The HTTP status code 451 "Unavailable For Legal Reasons" was not usable
in the httpd configuration. As a consequence, modules such as mod_rewrite
could not be configured to return a 451 error if required for legal
purposes. The 451 status code has been added to the list of available error
codes, and modules can now be configured to return a 451 error if required.
(BZ#1353269)

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/):

1347648 - Apache can not cache content if Expires header is modified
1353269 - Support sending http 451 status code from RewriteRule
1353755 - CVE-2016-5387 Apache HTTPD: sets environmental variable based on user supplied Proxy request header

6. Package List:

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

Source:
httpd-2.4.6-40.el7_2.4.src.rpm

noarch:
httpd-manual-2.4.6-40.el7_2.4.noarch.rpm

x86_64:
httpd-2.4.6-40.el7_2.4.x86_64.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
httpd-devel-2.4.6-40.el7_2.4.x86_64.rpm
httpd-tools-2.4.6-40.el7_2.4.x86_64.rpm
mod_ldap-2.4.6-40.el7_2.4.x86_64.rpm
mod_proxy_html-2.4.6-40.el7_2.4.x86_64.rpm
mod_session-2.4.6-40.el7_2.4.x86_64.rpm
mod_ssl-2.4.6-40.el7_2.4.x86_64.rpm

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

Source:
httpd-2.4.6-40.el7_2.4.src.rpm

noarch:
httpd-manual-2.4.6-40.el7_2.4.noarch.rpm

x86_64:
httpd-2.4.6-40.el7_2.4.x86_64.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
httpd-devel-2.4.6-40.el7_2.4.x86_64.rpm
httpd-tools-2.4.6-40.el7_2.4.x86_64.rpm
mod_ldap-2.4.6-40.el7_2.4.x86_64.rpm
mod_proxy_html-2.4.6-40.el7_2.4.x86_64.rpm
mod_session-2.4.6-40.el7_2.4.x86_64.rpm
mod_ssl-2.4.6-40.el7_2.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
httpd-2.4.6-40.el7_2.4.src.rpm

noarch:
httpd-manual-2.4.6-40.el7_2.4.noarch.rpm

ppc64:
httpd-2.4.6-40.el7_2.4.ppc64.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.ppc64.rpm
httpd-devel-2.4.6-40.el7_2.4.ppc64.rpm
httpd-tools-2.4.6-40.el7_2.4.ppc64.rpm
mod_ssl-2.4.6-40.el7_2.4.ppc64.rpm

ppc64le:
httpd-2.4.6-40.el7_2.4.ppc64le.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.ppc64le.rpm
httpd-devel-2.4.6-40.el7_2.4.ppc64le.rpm
httpd-tools-2.4.6-40.el7_2.4.ppc64le.rpm
mod_ssl-2.4.6-40.el7_2.4.ppc64le.rpm

s390x:
httpd-2.4.6-40.el7_2.4.s390x.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.s390x.rpm
httpd-devel-2.4.6-40.el7_2.4.s390x.rpm
httpd-tools-2.4.6-40.el7_2.4.s390x.rpm
mod_ssl-2.4.6-40.el7_2.4.s390x.rpm

x86_64:
httpd-2.4.6-40.el7_2.4.x86_64.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
httpd-devel-2.4.6-40.el7_2.4.x86_64.rpm
httpd-tools-2.4.6-40.el7_2.4.x86_64.rpm
mod_ssl-2.4.6-40.el7_2.4.x86_64.rpm

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

ppc64:
httpd-debuginfo-2.4.6-40.el7_2.4.ppc64.rpm
mod_ldap-2.4.6-40.el7_2.4.ppc64.rpm
mod_proxy_html-2.4.6-40.el7_2.4.ppc64.rpm
mod_session-2.4.6-40.el7_2.4.ppc64.rpm

ppc64le:
httpd-debuginfo-2.4.6-40.el7_2.4.ppc64le.rpm
mod_ldap-2.4.6-40.el7_2.4.ppc64le.rpm
mod_proxy_html-2.4.6-40.el7_2.4.ppc64le.rpm
mod_session-2.4.6-40.el7_2.4.ppc64le.rpm

s390x:
httpd-debuginfo-2.4.6-40.el7_2.4.s390x.rpm
mod_ldap-2.4.6-40.el7_2.4.s390x.rpm
mod_proxy_html-2.4.6-40.el7_2.4.s390x.rpm
mod_session-2.4.6-40.el7_2.4.s390x.rpm

x86_64:
httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
mod_ldap-2.4.6-40.el7_2.4.x86_64.rpm
mod_proxy_html-2.4.6-40.el7_2.4.x86_64.rpm
mod_session-2.4.6-40.el7_2.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
httpd-2.4.6-40.el7_2.4.src.rpm

noarch:
httpd-manual-2.4.6-40.el7_2.4.noarch.rpm

x86_64:
httpd-2.4.6-40.el7_2.4.x86_64.rpm
httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
httpd-devel-2.4.6-40.el7_2.4.x86_64.rpm
httpd-tools-2.4.6-40.el7_2.4.x86_64.rpm
mod_ssl-2.4.6-40.el7_2.4.x86_64.rpm

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

x86_64:
httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
mod_ldap-2.4.6-40.el7_2.4.x86_64.rpm
mod_proxy_html-2.4.6-40.el7_2.4.x86_64.rpm
mod_session-2.4.6-40.el7_2.4.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-2016-5387
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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