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.

 

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)

 

Full details and references:

 

https://access.redhat.com/errata/RHSA-2016:1422?sc_cid=701600000006NHXAA2

 

CVE Names:

 

CVE-2016-5387

 

Revision History:

 

Issue Date: 2016-07-18

Updated:    2016-07-18

 

 

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Take Action

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Run yum update for the necessary package(s) on each affected system.