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Alerts This Week
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Red Hat Enterprise Linux RHSA-2016:1421-01 Important: Httpd Proxy Issue

red hat
Calendar Grey July 18, 2016
Scroller Redhat
Important notice regarding httpd in Red Hat Enterprise Linux concerning possible vulnerabilities with proxy headers that could be exploited.
An update for httpd is now available for Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6

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.
Red Hat would like to thank Scott Geary (VendHQ) for reporting this issue.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux httpd Apache HTTP Server security impact important update proxy attack

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

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source: httpd-2.2.3-92.el5_11.src.rpm
i386: httpd-2.2.3-92.el5_11.i386.rpm httpd-debuginfo-2.2.3-92.el5_11.i386.rpm mod_ssl-2.2.3-92.el5_11.i386.rpm
x86_64: httpd-2.2.3-92.el5_11.x86_64.rpm httpd-debuginfo-2.2.3-92.el5_11.x86_64.rpm mod_ssl-2.2.3-92.el5_11.x86_64.rpm
Red Hat Enterprise Linux Desktop Workstation (v. 5 client):
Source: httpd-2.2.3-92.el5_11.src.rpm
i386: httpd-debuginfo-2.2.3-92.el5_11.i386.rpm httpd-devel-2.2.3-92.el5_11.i386.rpm httpd-manual-2.2.3-92.el5_11.i386.rpm
x86_64: httpd-debuginfo-2.2.3-92.el5_11.i386.rpm httpd-debuginfo-2.2.3-92.el5_11.x86_64.rpm httpd-devel-2.2.3-92.el5_11.i386.rpm httpd-devel-2.2.3-92.el5_11.x86_64.rpm httpd-manual-2.2.3-92.el5_11.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source: httpd-2.2.3-92.el5_11.src.rpm
i386: httpd-2.2.3-92.el5_11.i386.rpm httpd-debuginfo-2.2.3-92.el5_11.i386.rpm httpd-devel-2.2.3-92.el5_11.i386.rpm httpd-manual-2.2.3-92.el5_11.i386.rpm mod_ssl-2.2.3-92.el5_11.i386.rpm
ia64: httpd-2.2.3-92.el5_11.ia64.rpm httpd-debuginfo-2.2.3-92.el5_11.ia64.rpm httpd-devel-2.2.3-92.el5_11.ia64.rpm httpd-manual-2.2.3-92.el5_11.ia64.rpm mod_ssl-2.2.3-92.el5_11.ia64.rpm
ppc: httpd-2.2.3-92.el5_11.ppc.rpm httpd-debuginfo-2.2.3-92.el5_11.ppc.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:1421-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1421
Issue date: 2016-07-18

Topic

An update for httpd is now available for Red Hat Enterprise Linux 5 and RedHat Enterprise Linux 6.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 Enterprise Linux httpd Apache HTTP Server security impact important update proxy attack

Relevant Releases Architectures

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64

Bugs Fixed

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

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