Issued:

2016-07-18

Updated:

2016-07-18

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

Synopsis

Important: httpd security and bug fix update

Type/Severity

Security Advisory Important

Topic

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.

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)

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.

Affected Products

Updated Packages

• mod_session-2.4.6-40.el7_2.4.ppc64.rpm
• httpd-2.4.6-40.el7_2.4.x86_64.rpm
• mod_ldap-2.4.6-40.el7_2.4.x86_64.rpm
• httpd-devel-2.4.6-40.el7_2.4.s390x.rpm
• mod_session-2.4.6-40.el7_2.4.ppc64le.rpm
• mod_session-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.ppc64le.rpm
• httpd-tools-2.4.6-40.el7_2.4.x86_64.rpm
• mod_session-2.4.6-40.el7_2.4.x86_64.rpm
• httpd-debuginfo-2.4.6-40.el7_2.4.x86_64.rpm
• mod_proxy_html-2.4.6-40.el7_2.4.ppc64.rpm
• httpd-tools-2.4.6-40.el7_2.4.ppc64.rpm
• httpd-debuginfo-2.4.6-40.el7_2.4.ppc64.rpm
• mod_proxy_html-2.4.6-40.el7_2.4.x86_64.rpm
• mod_proxy_html-2.4.6-40.el7_2.4.s390x.rpm
• mod_ldap-2.4.6-40.el7_2.4.ppc64le.rpm
• httpd-devel-2.4.6-40.el7_2.4.ppc64le.rpm
• mod_ssl-2.4.6-40.el7_2.4.s390x.rpm
• httpd-tools-2.4.6-40.el7_2.4.ppc64le.rpm
• httpd-2.4.6-40.el7_2.4.s390x.rpm
• httpd-debuginfo-2.4.6-40.el7_2.4.ppc64le.rpm
• mod_ldap-2.4.6-40.el7_2.4.ppc64.rpm
• httpd-devel-2.4.6-40.el7_2.4.ppc64.rpm
• mod_ldap-2.4.6-40.el7_2.4.s390x.rpm
• httpd-devel-2.4.6-40.el7_2.4.x86_64.rpm
• httpd-manual-2.4.6-40.el7_2.4.noarch.rpm
• mod_proxy_html-2.4.6-40.el7_2.4.ppc64le.rpm
• mod_ssl-2.4.6-40.el7_2.4.ppc64.rpm
• httpd-2.4.6-40.el7_2.4.src.rpm
• httpd-2.4.6-40.el7_2.4.ppc64le.rpm
• httpd-2.4.6-40.el7_2.4.ppc64.rpm
• mod_ssl-2.4.6-40.el7_2.4.x86_64.rpm
• httpd-debuginfo-2.4.6-40.el7_2.4.s390x.rpm

Fixes

• This content is not included.BZ - 1347648
• This content is not included.BZ - 1353269
• This content is not included.BZ - 1353755

CVEs

• CVE-2016-5387

References

• http://www.redhat.com/security/updates/classification/#normal

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.