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 869819 - New 'compression attack' backport ready for corner case security matter
Summary: New 'compression attack' backport ready for corner case security matter
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: httpd
Version: 6.3
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Luboš Uhliarik
QA Contact: BaseOS QE - Apps
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-10-24 21:05 UTC by R P Herrold
Modified: 2021-01-14 09:34 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-12-02 11:24:19 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description R P Herrold 2012-10-24 21:05:39 UTC 
Description of problem:

It appears a httpd attack through mod_ssl has been identified, and a fix back-ported upstream into Apache 2.2

Version-Release number of selected component (if applicable):

see: https://issues.apache.org/bugzilla/show_bug.cgi?id=53219

How reproducible:

seen during an audit at: https://www.ssllabs.com/ssltest/analyze.html

Steps to Reproduce:

deploy a unit, updated to current and hardened against 'Beast' and one still gets:

Protocol Details
Secure Renegotiation 	Supported, with client-initiated renegotiation disabled
Insecure Renegotiation 	Not supported
BEAST attack 	Not vulnerable
Compression 	Yes   INSECURE (more info)

with an outlink to:

https://community.qualys.com/blogs/securitylabs/2012/09/14/crime-information-leakage-attack-against-ssltls
  
Actual results:

The noted exception

Expected results:

no exceptions

Additional info:
Comment 4 Tomas Hoger 2012-10-29 13:33:06 UTC 
See bug 857051, comment 5 for a way to disable SSL compression in existing httpd versions in Red Hat Enterprise Linux 5 and 6.
Comment 6 Joe Orton 2012-10-29 15:43:49 UTC 
There's an ongoing debate on whether or not to change the OpenSSL default on compression.  If this does change, the httpd config option will not be necessary and would work in unexpected ways.  So we are not planning to add this feature to httpd at the current time.

See Tomas's link above for a method to forcibly disable SSL compression support in httpd.
Comment 10 RHEL Program Management 2013-10-14 00:20:18 UTC 
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unable to address this
request at this time.

Red Hat invites you to ask your support representative to
propose this request, if appropriate, in the next release of
Red Hat Enterprise Linux.
Comment 11 Tomas Hoger 2013-11-11 14:54:09 UTC 
(In reply to Joe Orton from comment #6)
> There's an ongoing debate on whether or not to change the OpenSSL default on
> compression.

Note that openssl packages in Red Hat Enterprise Linux and Fedora were changed to disable compression by default:

https://rhn.redhat.com/errata/RHSA-2013-0587.html

SSLCompression on does not re-enable compression in httpd/mod_ssl.
Comment 12 Joe Orton 2013-12-02 11:24:19 UTC 
Given that the OpenSSL default is now "compression off"... and we have no way to programatically enable SSL/TLS compression via mod_ssl, there does not seem to be any need to add the "SSLCompression" directive any more.
Note You need to log in before you can comment on or make changes to this bug.