Bug 98401 - Supplied ssl.conf enables eNULL encryption
Summary: Supplied ssl.conf enables eNULL encryption
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: httpd   
(Show other bugs)
Version: 9
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Joe Orton
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2003-07-02 13:40 UTC by Jon Warbrick
Modified: 2007-04-18 16:55 UTC (History)
2 users (show)

Fixed In Version: 2.0.47-4
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2003-09-12 11:01:02 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

Description Jon Warbrick 2003-07-02 13:40:21 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021203

Description of problem:
The supplied /etc/httpd/conf.d/ssl.conf sets SSLCipherSuite to include the eNULL
cipher suite. This is a security risk - if both ends of an SSL connection
support eNULL than an attacker can convince them that only these ciphers are
available and cause them to negotiate a connection using no encryption. eNULL
should therefore be disabled by default.

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

How reproducible:

Steps to Reproduce:
1.Look at /etc/httpd/conf.d/ssl.conf

Actual Results:  SSLCipherSuite contains eNULL

Expected Results:  SSLCipherSuite should not contain eNULL

Additional info:

Comment 1 Joe Orton 2003-07-02 15:48:54 UTC
Thanks for the report.

Comment 2 Jon Warbrick 2003-07-07 10:19:34 UTC
While I stand by the statement that having eNULL as an available cipher suite
is a bad idea, it looks as if my assertion that an attacker could cause this to 
be selected in preference to 'real' cipher suites is incorrect. On double
checking, I find that SSL correctly protects itself against man-in-th-middle
tampering of the initial handshake (which includes the choice of cipher suite).

I still think that this is a bug, but you can probably down-grade the severity.

Comment 3 Joe Orton 2003-09-12 11:01:02 UTC
This is fixed in Raw Hide, mod_ssl-2.0.47-4 and later.

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