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AUSCERT External Security Bulletin Redistribution
ESB-2019.3811
IBM Connect:Direct for UNIX is Vulnerable to a Privilege
Escalation Attack via its C/C++ API
11 October 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Connect:Direct for UNIX
Publisher: IBM
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-4529
Reference: ESB-2019.3738
Original Bulletin:
https://www.ibm.com/support/pages/node/1074722
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Security Bulletin: IBM Connect:Direct for UNIX is Vulnerable to a Privilege
Escalation Attack via its C/C++ API
Security Bulletin
Summary
IBM Sterling Connect:Direct for UNIX could allow a user who is authorized
for limited Connect:Direct privileges to attack through a custom
application written using the Connect:Direct for UNIX C/C++ API by
replacing the system implementation of getuid() with a malicious
implementation and gain unauthorized privilege to access to the
Connect:Direct for UNIX Server.
Vulnerability Details
CVEID: CVE-2019-4529
DESCRIPTION: IBM Sterling Connect:Direct for UNIX could allow an
authenticated attacker to replace the system implementation of getuid()
with a malicious implementation allowing the user to gain unauthorized
access to the CD UNIX Server through a custom application written using
the CD UNIX C/C++ API.
CVSS Base Score: 7.5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/165585 for the
current score.
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
IBM Sterling Connect:Direct for Unix 6.0.0
IBM Sterling Connect:Direct for Unix 4.3.0
IBM Sterling Connect:Direct for Unix 4.2.0
Remediation/Fixes
+------------------------------------------------------------------------+
| V.R.M.F | APAR | Remediation/First Fix |
|---------+---------+----------------------------------------------------|
| 6.0.0 | IT27957 | Apply 6.0.0.1.iFix006, available in cumulative |
| | | iFix 6.0.0.1.008 on [1]Fix Central |
|---------+---------+----------------------------------------------------|
| 4.3.0 | IT27957 | Apply 4.3.0.1.iFix009, available in cumulative |
| | | iFix 4.3.0.1.010 on [2]Fix Central |
|---------+---------+----------------------------------------------------|
| 4.2.0 | IT27957 | Apply 4.2.0.4.iFix122, available in cumulative Fix |
| | | Pack 4.2.0.5 on [3]Fix Central |
+------------------------------------------------------------------------+
[1] http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~Other%2Bsoftware&product=ibm/Other+software/Sterling+Connect%3ADirect+for+UNIX&release=6.0.0.1&platform=All&function=fixId&fixids=6.0.0.1*iFix008*&includeSupersedes=0
[2] http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~Other%2Bsoftware&product=ibm/Other+software/Sterling+Connect%3ADirect+for+UNIX&release=4.3.0.1&platform=All&function=fixId&fixids=4.3.0.1*iFix010*&includeSupersedes=0
[3] http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~Other%2Bsoftware&product=ibm/Other+software/Sterling+Connect%3ADirect+for+UNIX&release=4.2.0.5&platform=All&function=fixId&fixids=4.2.0.5*iFix000*&includeSupersedes=0
For versions previous to 4.2.0, IBM recommends upgrading to a fixed,
supported version of the product.
Workarounds and Mitigations
None
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.
Change History
10 October 2019: 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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