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Security Bulletin: IBM Connect:Direct for UNIX is Vulnerable to a Privilege Escalation Attack via its ndmauth modules

Security Bulletin


IBM Sterling Connect:Direct for UNIX could allow a user who is authorized for limited system privileges to attack through the ndmauth modules taking advantage of a buffer overflow vulnerability to manipulate CD UNIX and obtain root privileges.

Vulnerability Details

CVEID:   CVE-2020-4587
DESCRIPTION:   IBM Sterling Connect:Direct for UNIX is vulnerable to a stack based buffer ovreflow, caused by improper bounds checking. A local attacker could manipulate CD UNIX to obtain root provileges.
CVSS Base score: 8.4
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Connect:Direct for UNIX6.1.0
IBM Connect:Direct for UNIX6.0.0
IBM Sterling Connect:Direct for UNIX4.3.0
IBM Sterling Connect:Direct for UNIX4.2.0


V.R.M.F APARRemediation/First Fix
6.1.0IT33840Apply, available in cumulative iFix031 on Fix Central
6.0.0IT33840Apply, available in cumulative iFix060 on Fix Central
4.3.0IT33840Apply, available in cumulative iFix063 on Fix Central
4.2.0IT33840Apply, available on Fix Central

Workarounds and Mitigations


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This vulnerability was reported to IBM by Sabine Degen

Change History

21 Aug 2020: Initial Publication

*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.


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.

Document Location


[{"Business Unit":{"code":"BU055","label":"Cognitive Applications"},"Product":{"code":"SSKTYY","label":"IBM Sterling Connect:Direct for UNIX"},"Component":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1.0, 6.0.0, 4.3.0, 4.2.0","Edition":"","Line of Business":{"code":"LOB02","label":"AI Applications"}}]

Document Information

Modified date:
21 August 2020