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Red Hat 6/7: RHSA-2016-1420-01 Important: Remote Attack in httpd24

Calendar Jul 18, 2016 • User Avatar LinuxSecurity Advisories
5 - 9 min read
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security advisory red hat remote access security impact httpd update httpd exploit
An update for httpd24-httpd is now available for Red Hat Software Collections. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, 
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====================================================================                   Red Hat Security Advisory

Synopsis:          Important: httpd24-httpd security update
Advisory ID:       RHSA-2016:1420-01
Product:           Red Hat Software Collections
Advisory URL:      https://access.redhat.com/errata/RHSA-2016:1420
Issue date:        2016-07-18
CVE Names:         CVE-2016-4979 CVE-2016-5387 
====================================================================
1. Summary:

An update for httpd24-httpd is now available for Red Hat Software
Collections.

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 Software Collections for Red Hat Enterprise Linux Server (v. 6) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - noarch, 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.

* A flaw was found in the way httpd performed client authentication using
X.509 client certificates. When the HTTP/2 protocol was enabled, a remote
attacker could use this flaw to access resources protected by certificate
authentication without providing a valid client certificate.
(CVE-2016-4979)

Red Hat would like to thank Scott Geary (VendHQ) for reporting
CVE-2016-5387 and Apache Software Foundation for reporting CVE-2016-4979.
Upstream acknowledges Erki Aring (Liewenthal Electronics Ltd) as the
original reporter of CVE-2016-4979.

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/):

1352476 - CVE-2016-4979 httpd: X509 client certificate authentication bypass using HTTP/2
1353755 - CVE-2016-5387 Apache HTTPD: sets environmental variable based on user supplied Proxy request header

6. Package List:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6):

Source:
httpd24-httpd-2.4.18-11.el6.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el6.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el6.x86_64.rpm
httpd24-mod_session-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el6.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6):

Source:
httpd24-httpd-2.4.18-11.el6.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el6.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el6.x86_64.rpm
httpd24-mod_session-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el6.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7):

Source:
httpd24-httpd-2.4.18-11.el6.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el6.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el6.x86_64.rpm
httpd24-mod_session-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el6.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6):

Source:
httpd24-httpd-2.4.18-11.el6.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el6.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el6.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el6.x86_64.rpm
httpd24-mod_session-2.4.18-11.el6.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el6.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7):

Source:
httpd24-httpd-2.4.18-11.el7.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el7.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el7.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el7.x86_64.rpm
httpd24-mod_session-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el7.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1):

Source:
httpd24-httpd-2.4.18-11.el7.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el7.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el7.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el7.x86_64.rpm
httpd24-mod_session-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el7.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2):

Source:
httpd24-httpd-2.4.18-11.el7.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el7.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el7.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el7.x86_64.rpm
httpd24-mod_session-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el7.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7):

Source:
httpd24-httpd-2.4.18-11.el7.src.rpm

noarch:
httpd24-httpd-manual-2.4.18-11.el7.noarch.rpm

x86_64:
httpd24-httpd-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-debuginfo-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-devel-2.4.18-11.el7.x86_64.rpm
httpd24-httpd-tools-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ldap-2.4.18-11.el7.x86_64.rpm
httpd24-mod_proxy_html-2.4.18-11.el7.x86_64.rpm
httpd24-mod_session-2.4.18-11.el7.x86_64.rpm
httpd24-mod_ssl-2.4.18-11.el7.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-2016-4979
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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Red Hat 6/7: RHSA-2016-1420-01 Important: Remote Attack in httpd24

red hat
Calendar Grey July 18, 2016
Dist Redhat Esm H88
Vital announcement for Red Hat Software Collections tackles significant vulnerabilities found in httpd24-httpd server applications.
An update for httpd24-httpd is now available for Red Hat Software Collections

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.

Summary

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.
* A flaw was found in the way httpd performed client authentication using X.509 client certificates. When the HTTP/2 protocol was enabled, a remote attacker could use this flaw to access resources protected by certificate authentication without providing a valid client certificate. (CVE-2016-4979)
Red Hat would like to thank Scott Geary (VendHQ) for reporting CVE-2016-5387 and Apache Software Foundation for reporting CVE-2016-4979. Upstream acknowledges Erki Aring (Liewenthal Electronics Ltd) as the original reporter of CVE-2016-4979.

Topics%20covered

Topics Covered

security advisory red hat remote access security impact httpd update httpd exploit

References

https://access.redhat.com/security/cve/CVE-2016-4979 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

Package List

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6):
Source: httpd24-httpd-2.4.18-11.el6.src.rpm
noarch: httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm
x86_64: httpd24-httpd-2.4.18-11.el6.x86_64.rpm httpd24-httpd-debuginfo-2.4.18-11.el6.x86_64.rpm httpd24-httpd-devel-2.4.18-11.el6.x86_64.rpm httpd24-httpd-tools-2.4.18-11.el6.x86_64.rpm httpd24-mod_ldap-2.4.18-11.el6.x86_64.rpm httpd24-mod_proxy_html-2.4.18-11.el6.x86_64.rpm httpd24-mod_session-2.4.18-11.el6.x86_64.rpm httpd24-mod_ssl-2.4.18-11.el6.x86_64.rpm
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6):
Source: httpd24-httpd-2.4.18-11.el6.src.rpm
noarch: httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm
x86_64: httpd24-httpd-2.4.18-11.el6.x86_64.rpm httpd24-httpd-debuginfo-2.4.18-11.el6.x86_64.rpm httpd24-httpd-devel-2.4.18-11.el6.x86_64.rpm httpd24-httpd-tools-2.4.18-11.el6.x86_64.rpm httpd24-mod_ldap-2.4.18-11.el6.x86_64.rpm httpd24-mod_proxy_html-2.4.18-11.el6.x86_64.rpm httpd24-mod_session-2.4.18-11.el6.x86_64.rpm httpd24-mod_ssl-2.4.18-11.el6.x86_64.rpm
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7):
Source: httpd24-httpd-2.4.18-11.el6.src.rpm
noarch: httpd24-httpd-manual-2.4.18-11.el6.noarch.rpm
x86_64: httpd24-httpd-2.4.18-11.el6.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:1420-01
Product: Red Hat Software Collections
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1420
Issue date: 2016-07-18

Topic

An update for httpd24-httpd is now available for Red Hat SoftwareCollections.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory red hat remote access security impact httpd update httpd exploit

Relevant Releases Architectures

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) - noarch, x86_64

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Bugs Fixed

1352476 - CVE-2016-4979 httpd: X509 client certificate authentication bypass using HTTP/2

1353755 - CVE-2016-5387 Apache HTTPD: sets environmental variable based on user supplied Proxy request header

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