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Alerts This Week
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Red Hat Enterprise Linux RHSA-2016-1978-01 Critical HTTP Proxy Issue

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Calendar Grey September 29, 2016
Scroller Redhat
Keep your Red Hat environments protected by applying this crucial update for python-twisted-web, which resolves an HTTP proxy concern.
An update for python-twisted-web is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory critical issue Red Hat HTTP proxy python-twisted-web

References

https://access.redhat.com/security/cve/CVE-2016-1000111 https://access.redhat.com/security/updates/classification/#important

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


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:1978-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1978.html
Issue date: 2016-09-29

Topic

An update for python-twisted-web is now available for Red Hat EnterpriseLinux 6 and Red Hat Enterprise Linux 7.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 critical issue Red Hat HTTP proxy python-twisted-web

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

Bugs Fixed

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

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