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MF64534 - LIC-SSL System TLS ROBOT attack VU#144389

PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-SSL System TLS ROBOT attack VU#144389


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
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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.

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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
--------------  ------------------------------------------------------------
   MF64144      LIC-SSL SYSTEM TLS CLIENTHELLO DOES NOT INCLUDE EC_POINT_FOR

Summary Information

System.............................. i
Models..............................
Release............................. V7R3M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA46852
Superseded by:......................
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C8242730


System i Support

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Document information

More support for: i family

Software version: V7R3M0

Operating system(s): OS/400

Reference #: MF64534

Modified date: 15 January 2018