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AUSCERT External Security Bulletin Redistribution
ESB-2016.1979
Security Bulletin: Multiple Denial of Service
vulnerabilities with Expat may affect IBM HTTP Server
17 August 2016
===========================================================================
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-2016-4472 CVE-2016-0718 CVE-2012-1148
CVE-2012-0876
Reference: ASB-2016.0081
ESB-2012.0552
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21988026
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Security Bulletin: Multiple Denial of Service vulnerabilities with Expat may
affect IBM HTTP Server
Security Bulletin
Document information
More support for:
IBM HTTP Server
Software version:
7.0, 8.0, 8.5, 8.5.5, 9.0
Operating system(s):
AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS
Software edition:
All Editions
Reference #:
1988026
Modified date:
2016-08-16
Summary
There are several vulnerabilities that may affect IBM HTTP Server that is
used by WebSphere Application Server.
Vulnerability Details
CVEID:
CVE-2012-0876
DESCRIPTION:
Expat is vulnerable to a denial of service, caused by insufficient
randomization of hash data structures. By sending multiple specially-crafted
HTTP POST requests to an affected application containing conflicting hash key
values, a remote attacker could exploit this vulnerability to cause the
consumption of CPU resources.
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/73868
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVEID:
CVE-2012-1148
DESCRIPTION:
Expat is vulnerable to a denial of service, caused by a memory leak in
poolGrow when handling XML data. A remote attacker could exploit this
vulnerability to cause the application using the vulnerable XML parsing
library to crash.
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/73867
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVEID:
CVE-2016-4472
DESCRIPTION:
Expat XML parser is vulnerable to a denial of service, caused by the removal
by compilers with certain optimization settings. By using a specially-crafted
XML data, a remote attacker could exploit this vulnerability to cause the
application to crash.
CVSS Base Score: 5.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/114683
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID:
CVE-2016-0718
DESCRIPTION:
Expat XML parser is vulnerable to a denial of service, caused by an out-of-
bounds read within XML parser. By using a specially-crafted file, a remote
attacker could exploit this vulnerability to cause the application to crash.
CVSS Base Score: 5.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/113408
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Affected Products and Versions
These vulnerabilities affects the following versions and releases of IBM HTTP
Server (powered by Apache) component in all editions of WebSphere Application
Server and bundling products.
Version 9.0
Version 8.5.5
Version 8.5
Version 8.0
Version 7.0
Remediation/Fixes
For affected IBM HTTP Server for WebSphere Application Server:
The recommended solution is to apply the interim fix, Fix Pack or PTF
containing APAR PI66849 for each named product as soon as practical.
For V9.0.0.0 through 9.0.0.1:
Apply Interim Fix
PI66849
- --OR--
Apply Fix Pack 9.0.0.2 or later (targeted availability 09 December 2016).
For V8.5.0.0 through 8.5.5.10:
Upgrade to minimum fix pack levels as required by interim fix and then apply
Interim Fix
PI66849
- --OR--
Apply Fix Pack 8.5.5.11 or later (targeted availability 20 February 2017).
For V8.0.0.0 through 8.0.0.12:
Upgrade to minimum fix pack levels as required by interim fix and then apply
Interim Fix
PI66849
- --OR--
Apply Fix Pack 8.0.0.13 or later (targeted availability 24 October 2016).
For V7.0.0.0 through 7.0.0.41:
Upgrade to minimum fix pack levels as required by interim fix and then apply
Interim Fix
PI66849
- --OR--
Apply Fix Pack 7.0.0.43 or later (targeted availability 2Q2017).
Get Notified about Future Security Bulletins
Subscribe to
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to be notified of important product support alerts like this.
References
Complete CVSS v2 Guide
On-line Calculator v2
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
16 August 2016: 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.
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