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MF61242 - LIC-SSL Remove RSA_MD5 from System SSL/TLS default sig alg l

PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

LIC-SSL Remove RSA_MD5 from System SSL/TLS default sig alg l


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.

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REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
The RSA_MD5 protocol should not be used for TLSv1.2 signature
and hash operations due to the SLOTH vulnerabilities.

CORRECTION FOR APAR MA45218 :
-----------------------------
An administrator can completely disable the RSA_MD5 signature
and hash algorithm from being used by System SSL/TLS using the
System Service Tools (SST) Advanced Analysis Command SSLCONFIG
values without this PTF.  This is done by manually removing
RSA_MD5 from the default signature algorithm list.

This PTF explicitly removes RSA_MD5 from the default signature
algorithm list.

Applications coded to use the default value for TLSv1.2
signature algorithms will no longer negotiate the use of RSA_MD5
signatures with TLSv1.2 peers.  This includes the use of digital
certificates with a MD5 signature.

If RSA_MD5 support is required by peers of such an application
after this PTF is applied, the value can be added back to the
System SSL/TLS default signature algorithm list using System
Service Tools (SST) Advanced Analysis Command SSLCONFIG.

To change the System SSL settings with the Start System
Service
Tools (STRSST) command, follow these steps:

1. Open a character-based interface.
2. On the command line, type STRSST.
3. Type your service tools user name and password.
4. Select option 1 (Start a service tool).
5. Select option 4 (Display/Alter/Dump).
6. Select option 1 (Display/Alter storage).
7. Select option 2 (Licensed Internal Code (LIC) data).
8. Select option 14 (Advanced analysis).
9. Select option 1 (SSLCONFIG).
10. Enter -h

This will show the help screen that describes the input strings
to change the System SSL setting for signatureAlgorithmList
(default list) and supportedSignatureAlgorithmList.

CIRCUMVENTION FOR APAR MA45218 :
--------------------------------
None.


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 MA45218
Superseded by:...................... View fix details for PTF MF62916
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C6120710


System i Support

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Document information

More support for: i family

Software version: V7R1M0

Operating system(s): OS/400

Reference #: MF61242

Modified date: 26 January 2016