RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 960168 - failed incoming SSL connection stays open
Summary: failed incoming SSL connection stays open
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: python
Version: 6.4
Hardware: All
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Matej Stuchlik
QA Contact: Jan Kepler
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-05-06 15:31 UTC by Saveliev Peter
Modified: 2016-02-01 02:14 UTC (History)
7 users (show)

Fixed In Version: python-2.6.6-47.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-11-21 09:14:59 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
simple SSL server testcase (1.18 KB, text/x-python)
2013-05-06 15:32 UTC, Saveliev Peter
no flags Details
SSL fix backported from 2.7 (1.56 KB, patch)
2013-06-03 10:49 UTC, Matej Stuchlik
no flags Details | Diff


Links
System ID Private Priority Status Summary Last Updated
Python 17918 0 None None None Never
Red Hat Product Errata RHSA-2013:1582 0 normal SHIPPED_LIVE Moderate: python security, bug fix, and enhancement update 2013-11-20 21:39:43 UTC

Description Saveliev Peter 2013-05-06 15:31:22 UTC
Description of problem
======================

Having a server with SSLSocket waiting for connections, the incoming connection, failed on automatic do_handshake(), stays open forever — accept() raises the SSLError and does not return client connection socket.

How reproducible
================

146%

Steps to reproduce
==================

server side:

1. create a SOCK_STREAM socket
2. wrap it with wrap_socket()
3. listen()
4. accept()

client side:

1. telnet to this port
2. enter any random text
  

Expected results
================

1. Incoming connection is closed and client disconnected

Actual results
==============

1. On the server side, due to exception, the reference to the incoming connection gets lost.
2. The client stays connected as long as the server operates.

Actually, this issue can lead to unintentional DoS, if a client will try open new connections on a failure — without explicit closing failed ones.

Possible fix
============

Add into do_handshake() something like that:

    try:
        self._sslobj.do_handshake()
    except SSLError as e:
        self._sock.close()
        raise e

Additional info
===============

Python bugzilla issue: http://bugs.python.org/issue17918
Important: only Python2 versions are affected. Python3 works OK.
Possibly related issue: http://bugs.python.org/issue12378 (differs: see the line above)

Comment 1 Saveliev Peter 2013-05-06 15:32:30 UTC
Created attachment 744237 [details]
simple SSL server testcase

Comment 3 Saveliev Peter 2013-05-07 08:37:33 UTC
Upstream issue is fixed and closed. Tested OK.

Merged into cpython 2.7 branch as http://hg.python.org/cpython/rev/85e5a93e534e

Comment 4 Bohuslav "Slavek" Kabrda 2013-05-22 12:20:55 UTC
This fix is easily backportable to RHEL 6 python-2.6.

Comment 5 Matej Stuchlik 2013-06-03 10:49:03 UTC
Created attachment 756235 [details]
SSL fix backported from 2.7

Comment 14 errata-xmlrpc 2013-11-21 09:14:59 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-1582.html


Note You need to log in before you can comment on or make changes to this bug.