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AUSCERT External Security Bulletin Redistribution
ESB-2014.0783
Security Bulletin: IBM HTTP Server CPU utilization (CVE-2014-0963)
21 May 2014
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM HTTP Server
Publisher: IBM
Operating System: AIX
HP-UX
IBM i
Linux variants
Solaris
Windows
z/OS
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-0963 CVE-2014-0098
Reference: ESB-2014.0782
ESB-2014.0764
ESB-2014.0714
ESB-2014.0702
ESB-2014.0679
ESB-2014.0438
ESB-2014.0396
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21672843
Comment: This bulletin contains two (2) IBM security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: IBM HTTP Server CPU utilization (CVE-2014-0963)
Security Bulletin
Document information
More support for:
WebSphere Application Server
IBM HTTP Server
Software version:
6.0.2, 6.1, 7.0, 8.0, 8.5, 8.5.5
Operating system(s):
AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS
Software edition:
Base, Developer, Enterprise, Network Deployment
Reference #:
1672843
Modified date:
2014-05-15
Summary
IBM HTTP Server is affected by a problem related to the SSL implementation
which, under very specific conditions, can cause CPU utilization to
rapidly increase.
Vulnerability Details
CVE ID: CVE-2014-0963
DESCRIPTION:
IBM HTTP Server is affected by a problem with the handling of certain
SSL messages. The TLS implementation can, under very specific conditions,
cause CPU utilization to rapidly increase. The situation occurs only in a
certain error case that causes a single thread to begin looping. If this
happens multiple times, more threads will begin to loop and an increase
in CPU utilization will be seen. This increase could ultimately result
in CPU exhaustion and unresponsiveness of the IBM HTTP Server and other
software running on the affected system.
This issue can affect the availability of the system, but does not impact
system confidentiality or integrity. This vulnerability can be remotely
exploited, authentication is not required and the exploit is moderately
complex.
To determine if your systems are being affected by this issue, you can
monitor the CPU utilization for IBM HTTP Server instances, or monitor the
mod_mpmstats output written to the ErrorLog.
CVSS Base Score: 7.1
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/92844 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)
Affected Products and Versions
This problem affects the IBM HTTP Server 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 PI17025 for each named product as soon as practical
For affected IBM HTTP Server for WebSphere Application Server:
For V8.5.0.0 through 8.5.5.2 Full Profile:
Apply Interim Fix PI17025
- --OR--
Apply Fix Pack 8.5.5.3 or later (targeted to be available 18 August 2014).
For V8.0 through 8.0.0.8:
Apply Interim Fix PI17025
- --OR--
Apply Fix Pack 8.0.0.9 or later (targeted to be available 23 June 2014).
For V7.0.0.0 through 7.0.0.31:
Apply Interim Fix PI17025
- --OR--
Apply Fix Pack 7.0.0.33 or later (targeted to be available 23 June 2014).
For V6.1.0.0 through 6.1.0.47:
Apply Interim Fix PI17025
For V6.0.0.0 through 6.0.2.43:
Apply Interim Fix PI17025
Workarounds and Mitigations
Use any of these workarounds:
For Any Release:
Disable mod_reqtimeout by commenting out both the line beginning
with "LoadModule reqtimeout_module..." in httpd.conf and any line
beginning with "RequestReadTimeout". Note: This is
not intuitive, but CVE-2014-0963 does not manifest in IBM HTTP
Server without mod_reqtimeout also loaded.
Configure very short thresholds with mod_reqtimeout, which shortens
the amount of time a thread can be tied up by CVE-2014-0963. See
the RequestReadTimeout directive.
Monitor CPU utilization of your IBM HTTP Server instances. If utilization
becomes abnormally high, stop and restart the affected instance.
Monitor mod_mpmstats output for unusual build-up of threads with active
module "mod_ibm_ssl"
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
Change History
15 May 2014: original document published
*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.
Cross reference information
Segment Product Component Platform Version Edition
Application Servers IBM HTTP Server SSL
Application Servers WebSphere Application
Server Hypervisor
Edition
- ----------------------------------------------------------------------------
Security Bulletin: Potential Denial of Service in IBM HTTP Server
CVE-2014-0098
Security Bulletin
Document information
More support for:
WebSphere Application Server
IBM HTTP Server
Software version:
6.1, 7.0, 8.0, 8.5, 8.5.5
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows, i5/OS, z/OS
Software edition:
Base, Developer, Enterprise, Network Deployment
Reference #:
1667526
Modified date:
2014-05-15
Summary
Potential Denial of Service in IBM HTTP Server for IBM WebSphere Application
Server.
Vulnerability Details
CVEID: CVE-2014-0098
Description: IBM HTTP Server may be vulnerable to a denial of service,
caused by certain cookies being logged in the access log. A remote attacker
could exploit this vulnerability to cause the server process to hang or
crash. This only affects users that have modified their configuration to
add cookie logging.
CVSS Base Score: 5.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/91879 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Affected Products and Versions
This problem affects the IBM HTTP Server component in all editions of
WebSphere Application Server and all products that bundle WebSphere
Application Server:
Version 8.5.5
Version 8.5
Version 8
Version 7
Version 6.1
Remediation/Fixes
The recommended solution is to apply the Fix Pack for each named product
as soon as practical.
Fix:Apply a Fix Pack containing this APAR PI13028, as noted below:
For affected IBM HTTP Server for WebSphere Application Server:
For V8.5.0.0 through 8.5.5.1 Full Profile:
Upgrade to a miniumum Fix Pack Level 8.5.0.2
Apply Interim Fix PI13028
- --OR--
Apply Fix Pack 8.5.5.3 or later (targeted to be available 18 August
2014).
For V8.0 through 8.0.0.8:
Upgrade to a minimum Fix Pack Level 8.0.0.6
Apply Interim Fix PI13028
- --OR--
Apply Fix Pack 8.0.0.9 or later (targeted to be available 23 June 2014).
For V7.0.0.0 through 7.0.0.31:
Upgrade to a minimum Fix Pack Level 7.0.0.29
Apply Interim Fix PI13028
- --OR--
Apply Fix Pack 7.0.0.33 or later (targeted to be available 23 June 2014).
For V6.1.0.0 through 6.1.0.47:
Ensure you are at Fix Pack 6.1.0.47 then apply Interim Fix PI13028
Workarounds and Mitigations
Do not log individual cookies. You may log the whole cookie header without
being vulnerable.
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
Recommended Fix List for IBM WebSphere Application Server
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
15 May 2014: Original published
*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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