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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2830
Security Bulletin: Multiple OpenSource Expat XML Vulnerabilities affect IBM
            DB2 Net Search Extender for Linux, Unix and Windows
                             30 November 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM DB2
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Linux variants
                   Solaris
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Privileged Data          -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Provide Misleading Information  -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5300 CVE-2016-4472 CVE-2016-0718
                   CVE-2015-2716 CVE-2015-1283 CVE-2012-6702
                   CVE-2012-1148 CVE-2012-1147 CVE-2012-0876

Reference:         ASB-2016.0103
                   ASB-2016.0081
                   ASB-2016.0075
                   ESB-2016.2787
                   ESB-2016.2687

Original Bulletin: 
   https://www-01.ibm.com/support/docview.wss?uid=swg21992933

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Security Bulletin: Multiple OpenSource Expat XML Vulnerabilities affect IBM 
DB2 Net Search Extender for Linux, Unix and Windows

Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7, 10.1, 10.5, 11.1

Operating system(s): AIX, HP-UX, Linux, Solaris, Windows

Software edition: Advanced Enterprise Server, Advanced Workgroup Server, 
Enterprise Server, Express, Express-C, Personal, Workgroup Server

Reference #: 1992933

Modified date: 21 November 2016

Security Bulletin

Summary

There are multiple vulnerabilities in open source expat XML parser that is 
used in DB2 Net Search Extender.

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-2012-1147

DESCRIPTION: Expat is vulnerable to a denial of service, caused by a resource
leak in readfilemap.c 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/73866 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-2015-1283

DESCRIPTION: Expat, as used in Google Chrome, is vulnerable to a heap-based 
buffer overflow, caused by multiple integer overflows in the XML_GetBuffer 
function. By persuading a victim to open a specially carfetd XML file, a 
remote attacker could overflow a buffer and execute arbitrary code on the 
system or cause the application to crash.

CVSS Base Score: 6.3

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/104964 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)

CVEID: CVE-2015-2716

DESCRIPTION: Expat, as used in Mozilla Firefox and Thunderbird, is vulnerable
to a buffer overflow, caused by improper bounds checking by the XML parser. By
persuading a victim to open a specially crafted XML file, a remote attacker 
could overflow a buffer and execute arbitrary code on the system or cause the
application to crash.

CVSS Base Score: 6.8

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/103214 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/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 is vulnerable to a buffer overflow, caused by improper 
bounds checking when processing malformed XML data. By using the Expat 
library, a remote attacker could overflow a buffer and execute arbitrary code
on the system with the privileges of the victim or cause the application to 
crash.

CVSS Base Score: 9.8

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:H/I:H/A:H)

CVEID: CVE-2012-6702

DESCRIPTION: Expat, when used in a parser that has not called XML_SetHashSalt
or passed it a seed of 0, could provide weaker than expected security. An 
attacker could exploit this vulnerability using attack vectors involving use 
of the srand function to defeat cryptographic protection mechanisms.

CVSS Base Score: 5.9

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/114541 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)

CVEID: CVE-2016-5300

DESCRIPTION: Expat XML parser is vulnerable to a denial of service, caused by
the failure to use sufficient entropy for hash initialization. By using a 
specially-crafted identifiers in an XML document, 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/114435 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

DB2 Net Search Extender V9.7, V10.1, V10.5 and V11.1 for all supported 
platforms

Remediation/Fixes

Release 		V9.7 			V10.1 			V10.5 			V11.1

APAR Number 		IT17226 		IT17231 		IT17232 		IT17233

Linux AMD 64bit 	V9.7 LinuxAMD64 	V10.1 LinuxAMD64 	V10.5 LinuxAMD64 	V11.1 LinuxAMD64

Linux 32bit 		N/A 			N/A 			V10.5 Linux32 		N/A

Windows 64bit 		V9.7 NTX64 		V10.1 NTX64 		V10.5 NTX64 		V11.1 NTX64

Windows 32bit 		V9.7 NT32 		V10.1 NT32 		V10.5 NT32 		N/A

AIX 64bit 		V9.7 AIX64 		V10.1 AIX64 		V10.5 AIX64 		V11.1 AIX64

zLinux 64bit 		V9.7 zLinux64 		V10.1 zLinux64 		V10.5 zLinux64 		V11.1 zLinux64

Sun 64bit 		V9.7 Sun64 		V10.1 Sun64 		V10.5 Sun64 		N/A

HP 64bit 		V9.7 HP64 		V10.1 HP64 		V10.5 HP64 		N/A

Workarounds and Mitigations

None

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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

24 October 2016 : Original Version 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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