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AUSCERT External Security Bulletin Redistribution
ESB-2014.2375.2
Security Bulletin: TLS padding vulnerability affects IBM
HTTP Server (CVE-2014-8730)
19 January 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM HTTP Server
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
z/OS
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-8730
Reference: ESB-2014.2325
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21692502
Revision History: January 19 2015: Ifixes available to change the default
December 11 2014: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: TLS padding vulnerability affects IBM HTTP Server
(CVE-2014-8730)
Document information
More support for:
IBM HTTP Server
SSL
Software version:
6.0.2, 6.1, 7.0, 8.0, 8.5, 8.5.5
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows Reference #:
1692502
Modified date:
2015-01-16
Security Bulletin
Summary
Transport Layer Security (TLS) padding vulnerability via a POODLE (Padding
Oracle On Downgraded Legacy Encryption) like attack affects IBM HTTP Server.
Vulnerability Details
CVE-ID: CVE-2014-8730
DESCRIPTION:
IBM HTTP Server could allow a remote attacker to obtain sensitive information,
caused by the failure to check the contents of the padding bytes when using
CBC cipher suites of some TLS implementations. A remote user with the ability
to conduct a man-in-the-middle attack could exploit this vulnerability via a
POODLE (Padding Oracle On Downgraded Legacy Encryption) like attack to decrypt
sensitive information and calculate the plain text of secure connections.
CVSS Base Score: 4.3
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/99216 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Affected Products and Versions
This vulnerability affects all versions and releases of IBM HTTP Server
(powered by Apache) component in all editions of WebSphere Application Server
and bundling products.
Version 8.5.5
Version 8.5
Version 7.0
Version 6.1
Version 6.0
Remediation/Fixes
The recommended solutions is to apply the interim fix, Fix Pack or PTF
containing APAR PI31516 for each named product as soon as practical. APAR
PI31516 enables the strict CBC padding by default.
For affected IBM HTTP Server for WebSphere Application Server:
For V8.5.0.0 through 8.5.5.4 Full Profile:
Upgrade to Fix Pack 8.5.5.2 or later then apply Interim Fix PI31516
- --OR--
Apply Fix Pack 8.5.5.5 or later (targeted availability 13 March 2015).
For V8.0 through 8.0.0.10:
Upgrade to Fix Pack 8.0.0.9 or later and then apply Interim Fix PI31516
- --OR--
Apply Fix Pack 8.0.0.11 or later (targeted availability 17 August 2015).
For V7.0.0.0 through 7.0.0.35:
Upgrade to Fix Pack 7.0.0.33 or later and then apply Interim Fix PI31516
- --OR--
Apply Fix Pack 7.0.0.37 or later (targeted availability 13 March 2015).
For V6.1.0.0 through 6.1.0.47:
Upgrade to Fix Pack 6.1.0.47 and then apply Interim Fix PI31516
For V6.0.0.0 through 6.0.2.43:
Upgrade to Fix Pack 6.0.2.43 and then apply Interim Fix PI31516 from IBM
Support.
Workarounds and Mitigations
For all versions and releases of Apache based IBM HTTP server, IBM recommends
enabling strict CBC padding enforcement. Add the following directive to the
httpd.conf file, for each context that contains "SSLEnable", to enable strict
CBC padding enforcement.
# Enable strict CBC padding
SSLAttributeSet 471 1
NOTE: Enabling strict CBC padding enforcement has the following prerequisites:
* Maintenance levels: 7.0.0.33, 8.0.0.9, 8.5.5.2 or later
- -- OR
* Any older fixpack/release with any one of the following interim fixes
applied: PI05309, PI08502, PI09443, PI13422, PI19700, PI26894
Stop and restart IHS for the changes to take affect.
Note:
If you start IHS with the -f command line argument, or you use the "Include"
directive to include alternate configuration files, you may need to search
those filenames for SSLEnable.
If you configure SSL with SSLEnable in the global (non-virtualhost) scope, you
will need to move SSLEnable into a virtualhost scope to add SSLAttributeSet
You should verify applying this configuration change does not cause any
compatibility issues.
Get Notified about Future Security Bulletins
Subscribe to My Notifications to be notified of important product support
alerts like this.
Important note
IBM strongly suggests that all System z customers be subscribed to the System
z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the
System z Security web site. Security and integrity APARs and associated fixes
will be posted to this portal. IBM suggests reviewing the CVSS scores and
applying all security or integrity fixes as soon as possible to minimize any
potential risk.
References
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Acknowledgement
none
Change History
10 December 2014: original version published
16 January 2015: Ifixes available to change the default
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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