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Red Hat Security Advisory 2016-1538-01

Red Hat Security Advisory 2016-1538-01
Posted Aug 2, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-1538-01 - The golang packages provide the Go programming language compiler. The following packages have been upgraded to a newer upstream version: golang. Security Fix: An input-validation flaw was discovered in the Go programming language built in CGI implementation, which set the environment variable "HTTP_PROXY" using the incoming "Proxy" HTTP-request header. The environment variable "HTTP_PROXY" is used by numerous web clients, including Go's net/http package, to specify a proxy server to use for HTTP and, in some cases, HTTPS requests. This meant that when a CGI-based web application ran, an attacker could specify a proxy server which the application then used for subsequent outgoing requests, allowing a man-in-the-middle attack.

tags | advisory, web, cgi
systems | linux, redhat
advisories | CVE-2016-5386
SHA-256 | a49af167bda5963869cc3ce421f91751bc6f1030d72c76554c0eec5ddbbaef2d

Red Hat Security Advisory 2016-1538-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: golang security, bug fix, and enhancement update
Advisory ID: RHSA-2016:1538-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1538.html
Issue date: 2016-08-02
CVE Names: CVE-2016-5386
=====================================================================

1. Summary:

An update for golang is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 Enterprise Linux Server Optional (v. 7) - noarch, x86_64

3. Description:

The golang packages provide the Go programming language compiler.

The following packages have been upgraded to a newer upstream version:
golang (1.6.3). (BZ#1346331)

Security Fix(es):

* An input-validation flaw was discovered in the Go programming language
built in CGI implementation, which set the environment variable
"HTTP_PROXY" using the incoming "Proxy" HTTP-request header. The
environment variable "HTTP_PROXY" is used by numerous web clients,
including Go's net/http package, to specify a proxy server to use for HTTP
and, in some cases, HTTPS requests. This meant that when a CGI-based web
application ran, an attacker could specify a proxy server which the
application then used for subsequent outgoing requests, allowing a
man-in-the-middle attack. (CVE-2016-5386)

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

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

5. Bugs fixed (https://bugzilla.redhat.com/):

1346331 - REBASE to golang 1.6
1353798 - CVE-2016-5386 Go: sets environmental variable based on user supplied Proxy request header

6. Package List:

Red Hat Enterprise Linux Server Optional (v. 7):

Source:
golang-1.6.3-1.el7_2.1.src.rpm

noarch:
golang-docs-1.6.3-1.el7_2.1.noarch.rpm
golang-misc-1.6.3-1.el7_2.1.noarch.rpm
golang-src-1.6.3-1.el7_2.1.noarch.rpm
golang-tests-1.6.3-1.el7_2.1.noarch.rpm

x86_64:
golang-1.6.3-1.el7_2.1.x86_64.rpm
golang-bin-1.6.3-1.el7_2.1.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-2016-5386
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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