ESB-2018.3050 - [Win][Linux][HP-UX][Solaris][AIX] IBM InfoSphere Information Server: Denial of service - Existing account 2018-10-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3050
    Security Bulletin: IBM InfoSphere Information Server is potentially
             vulnerable to XML External Entity Injection (XXE)
                              9 October 2018

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

Product:           IBM InfoSphere Information Server
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Linux variants
                   Solaris
                   Windows
Impact/Access:     Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1727  

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10718887

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Security Bulletin: IBM InfoSphere Information Server is potentially vulnerable
to XML External Entity Injection (XXE)

Document information

More support for: InfoSphere Information Server

Software version: 9.1, 11.3, 11.5, 11.7

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

Reference #: 0718887

Modified date: 08 October 2018

Summary

An XML External Entity Injection (XXE) vulnerability in InfoSphere Information
Server Manager can potentially be used by an attacker to retrieve sensitive
documents.

Information Server Manager has a bulk import feature to help users import
lists of Source Control Module (SCM) websites or user names.
Use case examples for the bulk load feature are:
- - Multiple users want to use the SCM and there are three or more sites that
need to be added.
- - DataStage version upgrades (i.e. version 11.3 to version 11.5)
IBM Information Server Manager uses XML format for export and import of the
SCM web site name and the links. Information Server Manager also allows the
same information to be keyed in manually into the Add Available Software Sites
dialog.

There is a potential vulnerability when importing the website list using XML
import.

Vulnerability Details

CVEID: CVE-2018-1727
DESCRIPTION: IBM InfoSphere Information Server is vulnerable to a XML External
Entity Injection (XXE) attack when processing XML data. A remote attacker
could exploit this vulnerability to expose sensitive information or consume
memory resources.
CVSS Base Score: 7.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
147630 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L)

Affected Products and Versions

The following products, running on all supported platforms, are affected:
IBM InfoSphere Information Server: versions 9.1, 11.3, 11.5, and 11.7
IBM InfoSphere Information Server on Cloud: versions 11.5, and 11.7

Remediation/Fixes

None

Workarounds and Mitigations

For all releases of Information Server Manager:

o Avoid using the XML import option. Instead, use the ADD button to add site
and link functionality information where possible.

o If XML format has to be used for import, manually check the XML file before
importing the file to determine if there is a DTD / DOCTYPE section or any
other section apart from SITE tag. DTD sections are not required in XML files
used with Information Server Manager, and if present, they can be safely
removed before importing. IBM recommends manually checking the XML file
content before importing the file. If there is a DTD / DOCTYPE section, verify
its contents for any unexpected content.

Sample XML for import:

    <xml version="1.0" encoding="UTF-8">
    <bookmarks>
              <site url="http://dl.microsoft.com/eclipse/tfs" selected="true"
name="TFS_Microsoft"/>
    </bookmarks>

Change History

08 October 2018: 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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