[RHSA-2016:1422-01] Important: httpd security and bug fix update

[news 28]

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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

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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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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