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                   Red Hat Security Advisory

Synopsis:          Important: python-twisted-web security update
Advisory ID:       RHSA-2016:1978-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-1978.html
Issue date:        2016-09-29
CVE Names:         CVE-2016-1000111 
=====================================================================

1. Summary:

An update for python-twisted-web is now available for Red Hat Enterprise
Linux 6 and 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

Twisted is an event-based framework for internet applications. Twisted Web
is a complete web server, aimed at hosting web applications using Twisted
and Python, but fully able to serve static pages too.

Security Fix(es):

* It was discovered that python-twisted-web 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-2016-1000111)

Note: After this update, python-twisted-web 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.

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/):

1357345 - CVE-2016-1000111 Python Twisted: sets environmental variable based on user supplied Proxy request header

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
python-twisted-web-8.2.0-5.el6_8.src.rpm

i386:
python-twisted-web-8.2.0-5.el6_8.i686.rpm

x86_64:
python-twisted-web-8.2.0-5.el6_8.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
python-twisted-web-8.2.0-5.el6_8.src.rpm

i386:
python-twisted-web-8.2.0-5.el6_8.i686.rpm

ppc64:
python-twisted-web-8.2.0-5.el6_8.ppc64.rpm

s390x:
python-twisted-web-8.2.0-5.el6_8.s390x.rpm

x86_64:
python-twisted-web-8.2.0-5.el6_8.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
python-twisted-web-8.2.0-5.el6_8.src.rpm

i386:
python-twisted-web-8.2.0-5.el6_8.i686.rpm

x86_64:
python-twisted-web-8.2.0-5.el6_8.x86_64.rpm

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

Source:
python-twisted-web-12.1.0-5.el7_2.src.rpm

x86_64:
python-twisted-web-12.1.0-5.el7_2.x86_64.rpm

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

Source:
python-twisted-web-12.1.0-5.el7_2.src.rpm

ppc64:
python-twisted-web-12.1.0-5.el7_2.ppc64.rpm

ppc64le:
python-twisted-web-12.1.0-5.el7_2.ppc64le.rpm

s390x:
python-twisted-web-12.1.0-5.el7_2.s390x.rpm

x86_64:
python-twisted-web-12.1.0-5.el7_2.x86_64.rpm

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

Source:
python-twisted-web-12.1.0-5.el7_2.src.rpm

x86_64:
python-twisted-web-12.1.0-5.el7_2.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-2016-1000111
https://access.redhat.com/security/updates/classification/#important

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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