python security update

CentOS Errata and Security Advisory CESA-2016:1978

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.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2016-September/084261.html
https://lists.centos.org/pipermail/centos-announce/2016-September/084262.html

Affected packages:
python-twisted-web

Upstream details at:
https://access.redhat.com/errata/RHSA-2016:1978