PTF Cover Letter
PTF ( Program Temporary Fixes ) Cover letter
OSP-DHCP/Fix CVE-2018-5732 and CVE-2018-5733 for ISC DHCP
Pre/Co-Requisite PTF / Fix List
REQ LICENSED PTF/FIX LEVEL
TYPE PROGRAM RELEASE NUMBER MIN/MAX OPTION
---- -------- --------- ------- ------- ------
NONE
NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels. This PTF may be a prerequisite
for future PTFs. By applying this PTF you authorize and agree to the
foregoing.
This PTF is subject to the terms of the license agreement which
accompanied, or was contained in, the Program for which you are obtaining
the PTF. You are not authorized to install or use the PTF except as part
of a Program for which you have a valid Proof of Entitlement.
SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.
The applicable license agreement may have been provided to you in printed
form and/or may be viewed using the Work with Software Agreements (WRKSFWAGR)
CL command.
APAR Error Description / Circumvention
-------------------------------------------------
ISC released CVE-2018-5732 and CVE-2018-5733.
CVE-2018-5732: Failure to properly bounds check a buffer used
for processing DHCP options allows a malicious server (or an
entity masquerading as a server) to cause a buffer overflow (and
resulting crash) in dhclient by sending a response containing a
specially constructed options section.
CVE-2018-5733: A malicious client which is allowed to send very
large amounts of traffic (billions of packets) to a DHCP server
can eventually overflow a 32-bit reference counter, potentially
causing dhcpd to crash.
CORRECTION FOR APAR 'SE69050' :
-------------------------------
Fixed the problems with the ISC-provided fixes.
Note: Please ignore the fix if ISC DHCP server is not used.
CIRCUMVENTION FOR APAR 'SE69050' :
----------------------------------
None.
Activation Instructions
None.
Special Instructions
End ISC DHCP server on the system
Example: ENDTCPSVR SERVER(*DHCP)
Then apply the PTF
Start ISC DHCP server on the system
Example: STRTCPSVR SERVER(*DHCP)
Note: Make sure OpenSSL on the system is compatible with OpenSSL
1.0.2n.
Default Instructions
THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.
Supersedes
PTF/FIX NO(S). APAR TITLE LINE
-------------- ------------------------------------------------------------
SI60110 OSP-DHCP/ CVE fix for CVE-2015-8605 and CVE-2016-2774
Summary Information
System.............................. i
Models..............................
Release............................. V7R2M0
Licensed Program.................... 5770SS1
APAR Fixed.......................... View details for APAR SE69050
Superseded by:...................... View fix details for PTF SI81441
Recompile........................... N
Library............................. QDNS
MRI Feature ........................ NONE
Cum Level........................... C8249720
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Document Information
Modified date:
01 December 2022