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             AUSCERT External Security Bulletin Redistribution

     IBM i is affected by networking BIND vulnerability CVE-2018-5743
                               19 June 2019


        AusCERT Security Bulletin Summary

Product:           BIND
Publisher:         IBM
Operating System:  IBM i
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5743  

Reference:         ESB-2019.2152

Original Bulletin: 

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IBM i is affected by networking BIND vulnerability CVE-2018-5743

Product:             IBM i
Software version:    7.1,7.2,7.3,7.4
Operating system(s): IBM i
Reference #:         0883384

Security Bulletin


ISC BIND is vulnerable to this security vulnerability. IBM i has addressed this

Vulnerability Details

CVEID: CVE-2018-5743
DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by a flaw
when setting the TCP client quota using the tcp-clients option. By sending a
specially-crafted request, a remote attacker could exploit this vulnerability
to cause the exhaustion of file descriptors.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
160127 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:H)

Affected Products and Versions

Releases 7.1, 7.2, 7.3, and 7.4 of IBM i are affected.


The issue can be fixed by applying a PTF to IBM i.
Releases 7.1, 7.2, 7.3, and 7.4 of IBM i are supported and will be fixed.

The IBM i PTF numbers are:
Release 7.1 - SI69882
Release 7.2 - SI69883
Release 7.3 - SI69885
Release 7.4 - SI69886


Important note: IBM recommends that all users running unsupported versions of
affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations


Change History

17 June 2019: Original Version Published

        Cross reference information
 Product  Component Platform Version Edition
IBM i 7.1           IBM i    7.1
IBM i 7.2           IBM i    7.2
IBM i 7.3           IBM i    7.3
IBM i 7.4           IBM i    7.4

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