RHEL 7 : httpd (RHSA-2016:1422) (httpoxy)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

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)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-5387.html
https://access.redhat.com/security/vulnerabilities/httpoxy
https://access.redhat.com/solutions/2435501
http://rhn.redhat.com/errata/RHSA-2016-1422.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.1
(CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 4.2
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 92399 ()

Bugtraq ID:

CVE ID: CVE-2016-5387

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