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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3738
       Security Bulletin: IBM Connect:Direct for UNIX is Vulnerable
            to a Privilege Escalation Attack via its C/C++ API
                              7 October 2019

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

Product:           IBM Sterling Connect:Direct for UNIX
Publisher:         IBM
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-4529  

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

Document Information

More support for:
Sterling Connect:Direct for UNIX

Software version:
4.2.0, 4.3.0, 6.0.0

Operating system(s):
Platform Independent

Reference #:
1074722

Modified date:
04 October 2019 

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 6.0.0.0.iFixTBD, available on Fix Central         |
+----------+---------+--------------------------------------------------------+
|4.3.0     |IT27957  |Apply 4.3.0.0.iFixTBD, available on Fix Central         |
+----------+---------+--------------------------------------------------------+
|4.2.0     |IT27957  |Apply 4.2.0.4.iFix122, available on Fix Central         |
+----------+---------+--------------------------------------------------------+

For versions previous to 4.2.0, IBM recommends upgrading to a fixed, supported
version of the product.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support
alerts like this.

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 v3 Guide
On-line Calculator v3

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

04 Oct 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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