PTF Cover Letter
PTF ( Program Temporary Fixes ) Cover letter
LIC-SSL System TLS ROBOT attack VU#144389
Pre/Co-Requisite PTF / Fix List
REQ LICENSED PTF/FIX LEVEL
TYPE PROGRAM REL NUMBER MIN/MAX OPTION
---- -------- --- ------- ------- ------
TR 5770999 710 MF99011 00/00 0000
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 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.
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.
APAR Error Description / Circumvention
-----------------------------------------------
As described in Vulnerability Note VU#144389:
TLS implementations may disclose side channel information via
discrepancies between valid and invalid PKCS#1 padding, and may
therefore be vulnerable to Bleichenbacher-style attacks. This
attack is known as a "ROBOT attack".
This problem applies to RSA key exchange cipher suites which
start with TLS_RSA or RSA.
CORRECTION FOR APAR MA46852 :
-----------------------------
Process different PKCS #1 v1.5 padding errors generated by the
ROBOT attack identically from the view point of the attacker so
discrepancies cannot be used to distinguish between valid and
invalid messages.
CIRCUMVENTION FOR APAR MA46852 :
--------------------------------
On IBM i 7.2 or newer partitions, disable the RSA key exchange
cipher suites by removing them from the QSSLCSL system value.
Activation Instructions
None.
Special Instructions
None.
Default Instructions
THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.
Supersedes
PTF/FIX NO(S). APAR TITLE LINE
-------------- ------------------------------------------------------------
NONE
Summary Information
System.............................. | i |
Models.............................. | |
Release............................. | V7R1M0 |
Licensed Program............... | 5770999 |
APAR Fixed.......................... | View details for APAR MA46852 |
Superseded by:...................... | |
Recompile........................... | N |
Library............................. | QSYS |
MRI Feature ........................ | NONE |
Cum Level........................... | NONE |
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Document Information
Modified date:
15 January 2018